Trimble. Configure and Scale With Ease Then record the average as the uncorrected antenna height. The height output from the receiver does not account for this offset; the Antenna Phase Center (APC) height is always given. If this receiver is mounted on a tripod, measure the height to the bottom of the groove between the gray base and the white top of the antenna, and select Center of bumper in the Measured to field. 3. The GNSS receiver has an interface to setup the antenna type, antenna height, and antenna measurement method. Want to participate in our Community Map? Weight: 820g. Refer to the following diagram where (1) is the Trimble GNSS receiver, (2) is the corrected height to APC and (3) is the uncorrected height of 1.80m. Slower re-initialization times when signals are lost due to obstructions. A rugged design suitable for land and marine applications. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. A TSO certified, dual-frequency antenna that supports centimeter-level accuracy. The AV39 is a lightweight, FAA TSO certified antenna for primary flight navigation with an ARINC 743 footprint. Provide an individual ANTEX file for each individual antenna. However, typically only the coordinates of the ground station which the antenna is setup over are known. If the Microcentered antenna (or a Compact L1/L2 antenna) has a groundplane measure to the underside of the notch in the groundplane. Trimble Business Center. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Store the ANTEX file in any folder at a computer contributing to the Trimble 4D Control Server system. Site Map. Create a complete solution by combining the Trimble R8s receiver with a Trimble controller running Trimble Accessfield software, and Trimble Business Center office software. Legal information | Glossary of terms. 26 0 obj <> endobj The Trimble GA830 antenna is designed to support centimeter-level accuracy for rugged land and marine applications. All you have to do is provide your location below and submit. indicates the antenna cannot track the signal type. There, select. This website uses cookies to improve your experience while you navigate through the website. See To change the antenna or prism height during an integrated survey. You only need to add the Antenna Model page if you want to override the antenna models. Trimble makes it fairly simple. Easy to integrate high-precision GNSS solutions offer OEMs and system integrators the ability to differentiate their products and gain a competitive edge in the marketplace. 74 0 obj <>stream Antenna Short (DC) Name. You also have the option to opt-out of these cookies. These cookies track visitors across websites and collect information to provide customized ads. This chart shows the Trimble antennas that are available for the R750 receivers. Trimble_antennas.atx at least provides two non-IGS antenna types (. Want to participate in our Community Map? Please do not submit your actual street address, just a city, town or regional location. Then record the average as the uncorrected antenna height. 0000000016 00000 n If this variation is ignored, the measured baseline will be between the average phase centers of the two antennas. Make sure that the antenna name in the ANTEX file completely matches the IGS conforming antenna name in the antennas.xml file. These cookies will be stored in your browser only with your consent. However, a real antenna does not have a single well-defined phase center. If you wish to further reduce the output coordinates (for example, reduce them to the ARP), you must do this reduction in your software applications, taking into account factors such as tilt of the antenna. Nevertheless, Trimble recommends backing up your individually created files. The difference in phase center positions from the GNSS satellite broadcasting antenna to the GNSS receiver phase center is where the phase measurement is determined. Trimble 4D Control Server accepts only one antenna calibration per file for individually calibrated antennas. 0000032825 00000 n With a fixed height range pole, the height is a constant value. 0000058117 00000 n A precise triple-frequency, L-band antenna suitable for a wide range of applications where the weight and size really matter. All you have to do is provide your location below and submit. 0000032405 00000 n Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. If this antenna is mounted on a tripod, measure the height to the bottom of the notch on the side of the antenna. Trimble and one of the Leica antennas have been fixed over a leveled flat table as shown in Fig. Refer to the following diagram where (1) is the Microcentered antenna, (2) is the corrected height to APC and (3) is the uncorrected height. 0000042535 00000 n Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. 26 49 Ly e;a9df~R|IC If you want to understand the location of the L1 and L2 Antenna Phase Centers with respect to the Mechanical Antenna Phase Center, add the Antenna Model page and then select the antenna type. indicates the capability and optimization to track the signal type. For the offsets automatically applied by the software, refer to the following diagram where: (3) is the uncorrected height measured from the pole tip to the bottom of the antenna. But opting out of some of these cookies may affect your browsing experience. Trimble and the Globe & Triangle logo are trademarks of Trimble Navigation Limited registered in the United States and in other countries. . 0000040907 00000 n For the same type . Receive updates on products, what's in the news and upcoming events. endstream endobj 34 0 obj <>stream Refer to the following diagram where (1) is the Trimble GNSS receiver, (2) is the corrected height to APC and (3) is the uncorrected height of 1.80m. IGS_antennas.atx provides the approved antenna corrections supplied by IGS. A helix based, dual-frequency antenna ideal for UAV applications due to its lightweight, small form factor and low power consumption design. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. This may happen, when you insert station data from IGS site logs. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Trimble R10 receiver Trimble integrated GNSS receiver Zephyr antenna Zephyr geodetic antenna Tornado antenna Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. TIP If available, an image of the selected antenna is displayed so that you can confirm that you have selected the correct antenna. 0000073954 00000 n The actual Antenna Phase Centers for L1 and L2 frequencies are points (or clouds) in space, typically above the Mechanical Antenna Phase Center. You must be logged in to your SurveyorConnect account to submit your location to the map. In the first experiment three GPS antennas have been used; two Leica GS15, and one Trimble R8-Model 3. A compact, dual-frequency antenna designed for aerial, land and marine applications. Trimble R12i receiver %%EOF To obtain the antenna phase center (APC), you must add an additional vertical offset, using the formula: Trimble antennas have an antenna gain of 50 dB and a maximum suggested cable loss of 12 dB for a total of 38 dB system gain, so the Gain Amplification should be set to Disabled. + gP7/|@n5&g. 0000038920 00000 n A INFLUNCIA DOS PARMETROS DE CALIBRAO DE ANTENAS. Residual error in horizontal position caused by antenna motion while measuring when the pole tip is stationary cannot be removed by changing the antenna height after measuring the point. TRMR10 NONE L1/L2/L5/G1/G2/G3/E1/E2/E5ab/E6/B1/B2/B3 NGS ( 5) 13/03/14, 0.0 -0.2 -0.6 -1.0 -1.0 -0.7 -0.2 0.2 0.2 -0.3, TRMR10 NONE L1/L2/L5/G1/G2/G3/E1/E2/E5ab/E6/B1/B2/B3 IGS ( 5) 13/03/14, ROBOT Geo++ GmbH 5 14-MAR-13 METH / BY / # / DATE, # Number of Calibrated Antennas GPS: 005 COMMENT, # Number of Individual Calibrations GPS: 010 COMMENT, # Number of Calibrated Antennas GLO: 005 COMMENT, # Number of Individual Calibrations GLO: 010 COMMENT, # derived from Delta PCV per 25.0 MHz COMMENT, # for frequency channel number k=0 COMMENT, -0.91 -0.65 [hl]+128.36[/hl] NORTH / EAST / UP. Refer to the following diagram where (1) is the Trimble R10 receiver, (2) is the lever of the R10 extension, (3) is the corrected height to the APC from the ground mark and (4) is the uncorrected height. Analytical cookies are used to understand how visitors interact with the website. Trimble and one of the Leica antennas have been fixed over a leveled flat table as shown in Fig. A Trimble "TR GEOD L1/L2 GP" S/N, 0220049315 antenna is applied as the reference 0000033281 00000 n ,1l{lx{B@$NF|i (b~_MZ} Antenna Measurement Method Select how the antenna height is being measured. Find company research, competitor information, contact details & financial data for FOLPOL SP Z O O of Pozna, wielkopolskie. 0000015923 00000 n To obtain the antenna phase center (APC), you must add an additional vertical offset, using the formula: APC = 0.141 + 0.010 = 0.151 To correct to the antenna reference point (ARP) which is what RINEX expects, you then have to subtract the "bottom of antenna mount" correction from the APC: ARP = 0151 - 0.065 = 0.086 Antenna Type Select the type of antenna being used with the receiver. You must convert it to vertical, using the formula: V = sqrt( S^2 - R^2) The U.S. National Geodetic Survey NGS (Gerald L. Mader) gives the following information at its WWW home page www.ngs.noaa.gov/ANTCAL/images/summary.html: A GPS geodetic solution for a baseline provides the vector between the phase centers of the antennas at either end of the baseline. xcn?J-Fl_k.^-=mekZ?%kK1?Ro7n`{(^bDQ FhgTt/:[Cb{/BYk9L8JCDYP)9 This category only includes cookies that ensures basic functionalities and security features of the website. If a Trimble antenna is used with a very long cable run that has, for example, a 20 dB loss, then the system gain is only 30 dB, so Gain Amplification should be Enabled. Trimble provides two GNSS antennas for geodetic applications. R8 GNSS/SPS88x Internal. A helix based, triple-frequency L-band antenna ideal for UAV applications due to its lightweight, small form factor and low power consumption design. Providing individual antenna calibrations. To get a precise check, you could pick a point that you can measure to, set up the antenna beside a fixed level rod, and fuss with getting a level on another tripod set to that height, read the rod, then set the level at the ARP height, read rod, and subtract rod readings. Both solutions deliver long term performance with proven accuracy and reliability. 0000014979 00000 n This is typically measured from a ground marker or the mounting point of the antenna. All other trademarks are the property of their respective owners. 0000017708 00000 n A compact, single-frequency antenna designed for aerial, land and marine applications. The Trimble GA810 antenna has been redesigned to support centimeter-level marine applications. Alignment reliability and pole tip position reliability, especially during movement of the antenna while the pole tip is stationary, relies completely on the antenna height being correct. 0000016783 00000 n 0000014521 00000 n Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. 0000021087 00000 n Refer to the following diagram where (1) is the Zephyr antenna, (2) is the corrected height to APC and (3) is the uncorrected height. To download the most recent antenna models, go to www.trimble.com/trimbleconfiguration_ts.asp. :#5nsOQ`1aB i%*Qt?Sfv"zX| 0000076000 00000 n It offers sub-centimeter phase center accuracy and superior signal tracking of current and near-future GNSS signals. 0000059591 00000 n To change the GNSS antenna height during an integrated survey you must change the current target height. 0000033152 00000 n The user can't do anything about the satellite phase center; however it is modeled to a great extent within the higher accuracy orbital ephemerides. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. When processing data from different receiver or antenna types together, the antenna phase center offsets are very important. From mark to "center of bumper" is a slant height. The Trimble AG25 antennas are designed to support centimeter-level land platforms like agriculture and logistic vehicles. If you deviate from the selected measurement method, you will have to manually correct the antenna height. The R10 has an extendable measure point. One thing I do is tighten up the tolerances first: tighten up the number of points created with the project settings>computations>Surface>breakline approximation parameters. The software automatically adds the appropriate offset value for the Measurement method you select when you enter the Antenna height value. 0000021888 00000 n Click Antenna Query to interrogate a supported antenna for its model and serial number. You can also use the offset values shown as a reference if your local regulations require you to manually calculate the APC height as a check for fieldbook purposes. Designed for applications in high shock and vibration environments like machine-control up to 75g shock and 20.4g RMS, the Zephyr Rugged is available in two versions with 5/8 mast mounting and with 3 mast clamp. These cookies do not store any personal information. trailer R8 GNSS/SPS88x. Necessary cookies are absolutely essential for the website to function properly. If this receiver is mounted on a tripod, measure the height to the bottom of the groove between the gray base and the white top of the antenna, and select Center of bumper in the Measured to field. Click the L1 Model Calibration or L2 Model Calibration button to view the offsets and the elevation-dependent tracking biases: These antenna calibrations are automatically used by the receiver when the correct antenna type is selected. The actual Antenna Phase Centers for L1 and L2 frequencies are points (or clouds) in space, typically above the Mechanical Antenna Phase Center. Trimble has developed leading high-precision solutions to ensure you operate successfully in all conditions. 0000042911 00000 n Comprehensive GNSS support, including GPS Modernization signals, GLONASS, BeiDou and Galileo You also have the option to opt-out of these cookies. To do so, the following is required: Note - Trimble strongly recommends that you do not edit the default files in the IGSConfig folder. Use these settings to define the antenna being used by the receiver. These cookies track visitors across websites and collect information to provide customized ads. You may receive more antenna information from external sources. ^.rxE"q35 h ;X@+Oaw[7A&N p`~k>L',B!8rX,:v -_]-P+ ZF=-.nl*[\@:2:-K],\VEj+w{Ez2To1 (3) is the corrected height to the APC from the ground mark, (4) is the uncorrected height, measured using a tape or measuring rod from the ground mark to the tip of the lever, (4) is the uncorrected height measured using a tape or measuring rod from the ground mark to the tip of the lever. In this paper, five different type antennas are applied. Trimbles GNSS Division provides high-precision GNSS modules for positioning and navigation solutions that serve a broad range of applications in agriculture, construction, mining, aviation, marine, and industrial automation. Re: antenna phase center offset of the TDC150. Analytical cookies are used to understand how visitors interact with the website. During installation, updates, or automatic downloads, Trimble 4D Control Server checks whether the default files to be downloaded already exist and how old they are. This folder contains a file called antennas.xml, which defines the antennas supported by Trimble software; and it contains at least two ANTEX (.atx) files, which provide absolute, elevation and azimuth dependent antenna corrections. Enter this value in the Antenna height field and set the Measured to field to Bottom of antenna. If this antenna is mounted on a tripod, measure the height to the join between the gray and white plastics on the antenna. However, be beware of the fact that the receiver module which will use this ANTEX file needs it at its local computer. You can use the geometry report command to check the specific values. See individual antenna specification sheets for full list of frequencies tracked and additional features. In the first experiment three GPS antennas have been used; two Leica GS15, and one Trimble R8-Model 3. Our GNSS Antenna table allows you compare Trimble models to find the best fit for your application. If this antenna is mounted on a tripod, measure the height to the bottom of the plastic housing. 0000021804 00000 n 60158-00. Therefore, the file must reside there. 0000078046 00000 n These average phase center locations are a weighted average of all the individual phase centers for each of the measurements included in the solution. The Trimble Zephyr 3 antennas offer full support for current and near-future GNSS signals including GPS, GLONASS, Galileo, BeiDou, OmniSTAR, Trimble RTX, and SABS. 0000014380 00000 n 0000058868 00000 n yHEvqZ.3fuW*VQk[R,qh"*T C&wWW #="O}>.L:DP>,)pIav1W:-!\b[4#/WlC%R N'z%KM|eCmx#V>o'pI8 &M !CC8_S2_-^i`iC"zl? In this paper, GPS observational data are applied to determine the offsets and variations of the GPS receivers' antennas of the Trimble, Leica and Ashtech GPS receivers. To evaluate the effect of antenna phase center offset and its variation on the baseline solution, three field experiments have been performed. Use the System Properties to access the Station Information. Os valores para a correo do erro de centro de fase da antena so os PCO (Phase Center Offset) e PCV (Phase Center Variation). If the Zephyr 3 Base antenna is mounted on a tripod, measure the height to the bottom of the notch on the side of the antenna. Back in the office, users can seamlessly process data with Trimble Business Center software. There are many measure points for trimble gear. where: V = vertical component, S = measured slant height (in this example 16.8 cm), and R = radial component (from antenna.ini), For the 5800/R8 receiver: In order to achieve results with millimeter accuracy these values must be considered carefully. When measuring or staking out points using IMU tilt compensation, make very sure the entered antenna height and measurement method is correct. 0000021735 00000 n Measure the height to three different underside notches around the perimeter of the groundplane. If you want to know the offsets between the Antenna Reference Point and the various Antenna Phase Centers, Trimble recommends using the Configuration Toolbox software. If the local files are older than the files to be installed, they are automatically overwritten. 0000001601 00000 n The RINEX converter will then correctly adjust the height down to ARP. You must be logged in to your SurveyorConnect account to submit your location to the map. The data collector will adjust for slope to each point. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Note - Trimble 4D Control Server assumes and requires antenna calibrations used in the system to be absolute, because IGS products, such as their Ultra Rapid Orbits, are based on absolute calibrations. 0000021622 00000 n This website uses cookies to improve your experience while you navigate through the website. For the Bottom of notch measurement method when the antenna is on a tripod, refer to the following diagram where: (5) is the uncorrected height from the ground mark to the underside of the notch. endstream endobj 27 0 obj <1\\dW, )/V 2>> endobj 28 0 obj )/Name(^^8N-#`&!\rT)/Prop_Build<>/Filter<>/PubSec<>>>/Reference[<>/Type/SigRef>>]/SubFilter/adbe.pkcs7.detached/Type/Sig>>>>/Type/Catalog/ViewerPreferences<>>> endobj 29 0 obj <> endobj 30 0 obj <>/Font<>>>/Fields 19 0 R/SigFlags 2>> endobj 31 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 32 0 obj [33 0 R 34 0 R 35 0 R 36 0 R 37 0 R 38 0 R 39 0 R 40 0 R] endobj 33 0 obj <>stream All rights reserved. 0000058413 00000 n In some instances, the terminology Nominal Antenna Phase Center may also be used, particularly when this point is at an arbitrary location or a location meant to coincide with similar antennas. The L1/L2 can be measured to the bottom of a notch. Size: 14.9cm (D) x 9.8cm (H) Mount: '' - 11 thread mount or 3 x M8 threaded surface mount. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Different antennas may have antenna phase centers differing by several centimeters. U8L.]As3 )J&X,&cuTd@cKHk~G;ZqtDkh#*We\0`>>v qF3'o @ck'H~@-g>kb=yP(N5P$B9ZwMrN ;tKQ8:dDd/" pI0uq(!i7"C*[MqQB8d2YN=3\By]p^ 1MHngJ }T However, the local environment around the antenna can introduce both azimuth and elevation variations from the ideally measured phase patterns Two types of antenna calibrations exist, the relative antenna calibrations which are determined by field measurements relatively with respect to a reference antenna and absolute calibrations. compact design. On the other hand, organizations such as NGS (U.S. National Geodetic Survey) or IFE (Institute for Geodesy) may have calibrated additional antenna types. Combined with rugged durability, the Trimble Zephyr 3 antenna will be a long-term investment. In addition, the antenna model accounts for elevation-dependent biases of the antenna, so that the satellite tracking is corrected at various elevation angles. 0000042220 00000 n A new reference system, IGS20, was released on 2 October 2022, replacing the previous IGS14 reference system. The Zephyr Rover minimizes multipath and offers robust low elevation tracking and millimeter phase center repeatability. Above the ARP is the Mechanical Antenna Phase Center, this is the physical point on the surface of the antenna element where the Antenna Phase Center electronics reside. 0000032850 00000 n If this antenna is mounted on a tripod, measure the height from the ground mark to the top of the notch protruding from the side of the antenna. 0000040265 00000 n 0000039565 00000 n 0000032665 00000 n Almost all GPS antennas currently in use are azimuthally symmetric and the dominant phase variation occurs with elevation. The entered antenna height and antenna measurement method values are only applied when setting the GNSS receiver up as a base station, since the CMR or RTCM correction message outputs the coordinate of the base stations Mechanical Antenna Phase Center. The height output from the receiver does not account for this offset; the Antenna Phase Center (APC) height is always given. Refer to the following diagram where (1) is the Tornado antenna, (2) is the corrected height to APC and (3) is the uncorrected height. R8 GNSS/SPS88x. NGS offers complete, downloadable files of absolute antenna calibrations in both ANTEX and ANTINFO formats. Trimble recommends using the default antenna models. Any measurement method to a point on the outside edge of the antenna, unless explicitly stated in the description, is assumed to be a slant height. For TDC150 with the internal antenna, two APC offset measurement methods are supported. The height output from the receiver does not account for this offset; the Antenna Phase Center (APC) height is always given. Measure the height to three different underside notches around the perimeter of the groundplane. These cookies will be stored in your browser only with your consent. 0000057821 00000 n ~K;7_*I}pzg]P,;%>3T|!J Trimble AG25 Using antenna files for antenna calibrations, www.ngs.noaa.gov/ANTCAL/images/summary.html. .C+W{SlD8m5/ K9:( Store the antenna corrections in an ANTEX file with extension .atx. In this case, if you did measure vertically to the center of bumper, the manual correction to APC would be S + additional vertical offset: In this case, to obtain the correct antenna height in the RINEX file, you should manually correct the antenna height to APC, enter that height in the antenna height entry of the RINEX converter and then select APC as the measurement method. Trimble Access field software provides specialized and customized workflows to make surveying tasks quicker and easier while enabling teams to communicate vital information between field and office in real time. 3. Antenna Phase Biases for R8 GNSS/SPS88x Internal (t6725010.ife) Antenna Phase Biases for R8 GNSS/SPS88x Internalt6725010.ife Antenna Offsets (mm) Band Northing Easting Up 2D Spin Error L1 0.9 -0.4 19.8 1.0 2.0 L2 -0.9 -0.4 8.5 1.0 2.0 Raw File (t6725010.ife) V = sqrt( (0.168 * 0.168) - (0.091 * 0.091) ) = 0.141, V is now vertical to the center of the bumper. When the antennas at opposite ends of relatively short baselines are identical, these variations should cancel out and no effect is seen. Refer to the following diagram where (1) is the Microcentered L1/L2 antenna, (2) is the groundplane, (3) is the underside of the notch and (4) is the top of the notch. If you are using a fixed height tripod, you can measure the height to the bottom of the antenna housing and select Bottom of antenna mount in the Measured to field. When processing data from different receiver or antenna types together, the antenna phase center offsets are very important. The software automatically adds the appropriate offset value for the Measurement method you select when you enter the Antenna height value. Gsk Finance Hub Europe , Wojewdztwo wielkopolskie, Pozna, ulica Pastelowa, 2: photos, address, and phone number, opening hours, photos, and user reviews on Yandex Maps. When I look at the base station information (for the CORS) the broadcast antenna type comes up as ADV NULL antenna with an antenna offset value (the value almost matches the L1 offset of the CORS antenna) . Refer to the tables below for standard prism to antenna offset values for the Trimble R8 and R10. We have access to a RTK network (single base stations). 0000014905 00000 n Also see: Antenna Phase Centers 2009, Trimble Navigation Limited. We also use third-party cookies that help us analyze and understand how you use this website. We also use third-party cookies that help us analyze and understand how you use this website. 0000057574 00000 n This setting is only applied at the base station in the generation of correction messages (CMR or RTCM). APC =0.141 + 0.010 = 0.151. The AV59 is a highly robust antenna with rugged 8-hole bulkhead mounting with rubber o-ring sealing for aerial, land, and marine applications. You can also use the offset values shown as a reference if your local regulations require you to manually calculate the APC height as a check for fieldbook purposes. Necessary cookies are absolutely essential for the website to function properly. IGS_antennas.atx provides the approved antenna corrections supplied by IGS. By clicking Accept, you consent to the use of ALL the cookies. This setting is only applied at the base station in the generation of correction messages (CMR or RTCM). Change the horizontal and vertical tolerance to be 0.001 to get more points. A high-performing lightweight GNSS rover antenna optimized for precision RTK and roving applications. mean phase center offset of every antenna. Trimble Survey Controller is a trademark of Trimble Navigation Limited. These can be found under the "Access Calibrations for All Antennas" menu above. 0000082566 00000 n Make sure that the antenna calibration provides absolute antenna phase center corrections. The R8 Model 2 tracks GPS and GLONASS constellations. Instead, the location of the phase center is a function of the direction from which it receives a signal. Please do not submit your actual street address, just a city, town or regional location. Setting the correct antenna type slightly improves the accuracy of the GNSS receiver, since the L1 and L2 Antenna Phase Center offsets are known and accounted for. Antenna Name. Part Number. Trimble_antennas.atx at least provides two non-IGS antenna types ( Unknown External and ADVNULLANTENNA ), which can be used, if the actual antenna type is unknown. Refer to the following diagram where (1) is the Trimble R10 receiver, (2) is the bottom of the antenna mount, (3) is the bottom of the quick release, (4) is the corrected height to the APC from the bottom of the pole.
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