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		| Remi Guerner 
 
 
 Joined: 14 Dec 2010
 Posts: 284
 
 
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				|  Posted: Sat Mar 17, 2018 5:55 am    Post subject: GPS antenna cable length |   |  
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				| This is a question for avionics gurus. After one full year of good service, my G5 EFIS with its enabled internal GPS antenna started to display wrong attitude information. After talking to the G3X team at Garmin, a software update fixed the issue, but after reviewing the recorded data of one of my flights, they came back to me and suggested I install an external antenna to improve the GPS reception. So I purchased a GA26C antenna (picture attached). The antenna comes ready for use with an 8 ft cable and BNC connector. I need only 2 ft to install the antenna on top of the instrument panel, therefore my questions: performance wise, is there an inconvenience to install the antenna as it is and attach the loops of extra cable length together? Is it worth cutting the extra length and install a new BNC connector? Would that reduce possible losses and/or susceptibility to electromagnetic interferences ?
 Remi Guerner
 
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		| rlborger(at)mac.com Guest
 
 
 
 
 
 
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				|  Posted: Sat Mar 17, 2018 6:23 am    Post subject: GPS antenna cable length |   |  
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				| Remi,
 Just my 2¢.  If you ask the Garmin folks they will insist that you not shorten the wire.  As such, just loop the excess and tuck it away under your instrument panel.
 
 Many years ago I upgraded an original Garmin to WAAS and the replacement antenna came with about 4 meters of cable.  The instructions forbade any attempt to shorten the cable as it would negatively impact the signal from the antenna.  So even though a meter of cable would have been more than sufficient to go from the Garmin to the antenna perched on the top of the instrument panel, I had to loop the other 3 meters and tuck inside the panel.
 
 I’m going to guess about why.  It may be because many GPS antennas are powered and have electronics associated with the antenna.  The cable length may be to provide proper impedance matching from radio to antenna electronics.  Any other comments are welcome.
 
 Blue skies & tailwinds,
 Bob Borger
 Europa XS Tri, Rotax 914, Airmaster C/S Prop (100 hrs).
 Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP, Hercules Prop.
 3705 Lynchburg Dr.
 Corinth, TX  76208-5331
 Cel: 817-992-1117
 rlborger(at)mac.com
 
 On Mar 17, 2018, at 8:55 AM, Remi Guerner <air.guerner(at)orange.fr> wrote:
 
 
 
 This is a question for avionics gurus. After one full year of good service, my G5 EFIS with its enabled internal GPS antenna started to display wrong attitude information. After talking to the G3X team at Garmin, a software update fixed the issue, but after reviewing the recorded data of one of my flights, they came back to me and suggested I install an external antenna to improve the GPS reception. So I purchased a GA26C antenna (picture attached). The antenna comes ready for use with an 8 ft cable and BNC connector. I need only 2 ft to install the antenna on top of the instrument panel, therefore my questions: performance wise, is there an inconvenience to install the antenna as it is and attach the loops of extra cable length together? Is it worth cutting the extra length and install a new BNC connector? Would that reduce possible losses and/or susceptibility to electromagnetic interferences ?
 
 Remi Guerner
 
 
 Read this topic online here:
 
 http://forums.matronics.com/viewtopic.php?p=478699#478699
 
 
 Attachments:
 
 http://forums.matronics.com//files/p1010978_629.jpg
 
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		| graeme bird 
 
  
 Joined: 15 Jul 2010
 Posts: 434
 
 
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				|  Posted: Sat Mar 17, 2018 7:50 am    Post subject: Re: GPS antenna cable length |   |  
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				| I think you are right, reducing the cable will reduce losses but 8ft is not that significant. The introduction of a connector will introduce impedance mismatches and losses that would probably amount to more. I would leave as is and avoid tight bends in the cable.
 
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 _________________
 Graeme Bird
 kit4 (Wagstaff) TBD
 Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
 Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
 Kit 1 G-UMPY -  Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk
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		| gilles.thesee(at)free.fr Guest
 
 
 
 
 
 
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				|  Posted: Sat Mar 17, 2018 7:54 am    Post subject: GPS antenna cable length |   |  
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				| Le 17/03/2018 à 14:55, Remi Guerner         a écrit :
 
 Hi Remi, 	  | Quote: |  	  |  	  | Quote: |  	  | G5 EFIS with its enabled internal GPS antenna started to display wrong attitude information. After talking to the G3X team at Garmin, a software update fixed the issue, but after reviewing the recorded data of one of my flights, they came back to me and suggested I install an external antenna to improve the GPS reception. So I purchased a GA26C antenna (picture attached). The antenna comes ready for use with an 8 ft cable and BNC connector. I need only 2 ft to install the antenna on top of the instrument panel, therefore my questions: performance wise, is there an inconvenience to install the antenna as it is and attach the loops of extra cable length together? Is it worth cutting the extra length and install a new BNC connector? Would that reduce possible losses and/or susceptibility to electromagnetic interferences ? 
 | 
 | 
 
 Your question seems to imply that you are using a Garmin G5 unit.
 Are you aware of this observations on the A&S Questions and     Answers about this antenna model ?
 
  	  | Quote: |  	  | Can the GA-26C be used             as a remote antenna for the Garmin G5? No, for the Garmin G5, you will need the GA 35 WAAS GPS.
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 That being said, how about first trying an antenna as-is before     undertaking any surgery on the coax ?
 
 --
 Amicalement,
 Gilles
 http://contrails.free.fr
 
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		| Burrilla 
 
 
 Joined: 25 Apr 2015
 Posts: 189
 
 
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				|  Posted: Sat Mar 17, 2018 8:00 am    Post subject: GPS antenna cable length |   |  
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				| Before you cut anything try it in your new position and ensure it has the desired improvement.
 If you can terminate with the correct, crimped connector, then you wont introduce any additional impedance change or effects and it will reduce the amount of cable clutter behind the panel, it can become a bit of a nightmare with some devices.
 
 If you cannot terminate with the right tools for the job, I suggest leave alone and loosely coil the cable, don’t crush or kink the coax as that will change the impedance.
 
 Thats what I would do.
 
 Alan
 
 
  	  | Quote: |  	  | On 17 Mar 2018, at 13:55, Remi Guerner <air.guerner(at)orange.fr> wrote: 
 
 
 This is a question for avionics gurus. After one full year of good service, my G5 EFIS with its enabled internal GPS antenna started to display wrong attitude information. After talking to the G3X team at Garmin, a software update fixed the issue, but after reviewing the recorded data of one of my flights, they came back to me and suggested I install an external antenna to improve the GPS reception. So I purchased a GA26C antenna (picture attached). The antenna comes ready for use with an 8 ft cable and BNC connector. I need only 2 ft to install the antenna on top of the instrument panel, therefore my questions: performance wise, is there an inconvenience to install the antenna as it is and attach the loops of extra cable length together? Is it worth cutting the extra length and install a new BNC connector? Would that reduce possible losses and/or susceptibility to electromagnetic interferences ?
 
 Remi Guerner
 
 
 
 
 Read this topic online here:
 
 http://forums.matronics.com/viewtopic.php?p=478699#478699
 
 
 
 
 Attachments:
 
 http://forums.matronics.com//files/p1010978_629.jpg
 
 
 
 
 
 
 
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		| Remi Guerner 
 
 
 Joined: 14 Dec 2010
 Posts: 284
 
 
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				|  Posted: Sat Mar 17, 2018 11:58 am    Post subject: Re: GPS antenna cable length |   |  
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				| Bonjour Gilles, 
 [quote]Can the GA-26C be used             as a remote antenna for the Garmin G5?
 No, for the Garmin G5, you will need the GA 35 WAAS GPS.
 
 The G5 Manual recommends the GA26C among others for non certified G5 installation.
 A Waas antenna is required only for certified aircraft only but the cost is not the same.
 
 [quote]
 That being said, how about first trying an antenna as-is before     undertaking any surgery on the coax ?
 
 On the Europa you need to remove the whole panel module to do that.
 So better do it right on the first try!
 
 Remi
 
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		| gilles.thesee(at)free.fr Guest
 
 
 
 
 
 
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				|  Posted: Sat Mar 17, 2018 12:33 pm    Post subject: GPS antenna cable length |   |  
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				| Le 17/03/2018 à 20:58, Remi Guerner a écrit :
  	  | Quote: |  	  | The G5 Manual recommends the GA26C among others for non certified G5 installation.
 
 | 
 Understand.
 
  	  | Quote: |  	  | On the Europa you need to remove the whole panel module to do that.
 
 | 
 Ouch !
 Any slack in the wiring to allow behind-the-panel access without too
 much hassle ?
 
 
  	  | Quote: |  	  | So better do it right on the first try! 
 | 
 Then as advised, keeping the excess length neatly stored in a loop seems
 the way to go.
 Please note that to minimize interference issues, the smaller the area
 of the loop the better. That is while preserving safe bending radius for
 the coax.
 You can also twist the loop in a figure 8 without stressing the coax.
 See https://support.agleader.com/kb_upload/image/coax4.jpg.
 
 All the best,
 --
 Best regards,
 Gilles
 http://contrails.free.fr
 http://lapierre.skunkworks.free.fr
 
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		| gilles.thesee(at)free.fr Guest
 
 
 
 
 
 
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				|  Posted: Sat Mar 17, 2018 12:38 pm    Post subject: GPS antenna cable length |   |  
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				|  	  | Quote: |  	  | Please note that to minimize interference issues, the smaller the area of the loop the better. That is while preserving safe bending radius
 for the coax.
 
 | 
 Hi again,
 Here is a picture to illustrate the above :
 http://www.mglavionics.com/kb/article/AA-00220/0/Can-I-shorten-the-GPS-Antenna-cable.html
 
 Hope this helps,
 --
 Best regards,
 Gilles
 http://contrails.free.fr
 http://lapierre.skunkworks.free.fr
 
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		| Remi Guerner 
 
 
 Joined: 14 Dec 2010
 Posts: 284
 
 
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				|  Posted: Sun Mar 18, 2018 12:13 am    Post subject: Re: GPS antenna cable length |   |  
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				| Thanks to all who have responded to my question. I will install the antenna with its full length cable bundled as recommended by MGL.
Remi[/quote]
 
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		| peterz(at)zutrasoft.com Guest
 
 
 
 
 
 
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				|  Posted: Sun Mar 18, 2018 3:48 am    Post subject: GPS antenna cable length |   |  
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				| Dumb question for the avionics experts: why not simply install the active gps antenna wart on top of the removable instrument panel on the glare shield and shorten the cable and terminate with a new matched connector using the correct crimper? Is there a magnetomer integrated into that "antenna"?
 Thx,
 Pete
 
 
  	  | Quote: |  	  | On Mar 18, 2018, at 4:13 AM, Remi Guerner <air.guerner(at)orange.fr> wrote: 
 
 
 Thanks to all who have responded to my question. I will install the antenna with its full length cable bundled as recommended by MGL.
 Remi
 | 
 
 
 
 
 Read this topic online here:
 
 http://forums.matronics.com/viewtopic.php?p=478720#478720
 
 
 
 
 
 
 
 
 
 [/quote]
 
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		| AirEupora 
 
 
 Joined: 01 Nov 2009
 Posts: 186
 Location: Dixon, CA
 
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				|  Posted: Sun Mar 18, 2018 6:31 am    Post subject: Re: GPS antenna cable length |   |  
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				| I installed the Garmin 430W in my Europa and it came with the eight foot cable.  I was told not to coil it.  I place the antenna just above the Hat Rack on the D bulkhead, inside,  then place the cable around the edge under the co-pilot's door ledge and then under the baggage floor then up to the antenna.  The 430 has worked beautifully.
 
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		| budyerly(at)msn.com Guest
 
 
 
 
 
 
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				|  Posted: Sun Mar 18, 2018 7:20 am    Post subject: GPS antenna cable length |   |  
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				| Hi Remi, 
Panel mounted EFIS units with internal GPS antennas are prone to interference depending on installation.
 
 I’ve always used an external antenna in my practice.  I mount them to a metal inverted hat shape to the top inside of the panel.  Early WAAS GPS antennas (those less expensive much lighter plastic type) work better when attached to a  metal surface. The large, heavy Garmin types have a metal base so a simple fiberglass mount in the panel works OK.   The Europa, being fiberglass, does not impede radio signals but the surrounding metal globs around these items do.  The proximity of other receiver antennas for some reason do not seem to bother one another.  Go figure.
 
 As far as antennas, I have always made my own BNC cables and connectors and never have had a problem once ohmed out.  RG 58/400 cable is fairly bulky and are easy to make to proper length.  Manufacturers normally resist allowing amateurs  to modify their cables for obvious reasons, but if you have the tools and know how, shortening a cable is perfectly fine.  I just prefer to remake the cable completely.  The small S type connectors and antenna wire, I coil up (because it is a small flexible  wire) and I place the coil in the panel away from the GPS antenna and all is fine as long as the coiled antenna wire is not wound around the antenna.  (I put mine along side the EFIS unit as its metal case should prevent interference.)    If you coil your  antenna wire, just use care where you put the coil.    Between the Garmin/Blue Mountain/EFIS of choice and the altimeter has always worked for me.  Be flexible, because if it doesn’t work in one spot it may in another.  Too bad the panel has to go in and out  if you are wrong.
 
 Electronics do go out of calibration from time to time, so a recalibration of altimeter, airspeed and EFIS systems are necessary over the life of an EFIS/NAV unit.  It just costs money and time, but not extra weight.
 
 Best Regards,
 Bud Yerly
 
 Sent from  Mail for Windows 10
 
 From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of Remi Guerner <air.guerner(at)orange.fr>
 Sent: Saturday, March 17, 2018 9:55:43 AM
 To: europa-list(at)matronics.com
 Subject: GPS antenna cable length
 
 
 --> Europa-List message posted by: "Remi Guerner" <air.guerner(at)orange.fr>
 
 This is a question for avionics gurus. After one full year of good service, my G5 EFIS with its enabled internal GPS antenna started to display wrong attitude information. After talking to the G3X team at Garmin, a software update fixed the issue, but after  reviewing the recorded data of one of my flights, they came back to me and suggested I install an external antenna to improve the GPS reception. So I purchased a GA26C antenna (picture attached). The antenna comes ready for use with an 8 ft cable and BNC connector.  I need only 2 ft to install the antenna on top of the instrument panel, therefore my questions: performance wise, is there an inconvenience to install the antenna as it is and attach the loops of extra cable length together? Is it worth cutting the extra length  and install a new BNC connector? Would that reduce possible losses and/or susceptibility to electromagnetic interferences ?
 
 Remi Guerner
 
 
 
 
 Read this topic online here:
 
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		| Remi Guerner 
 
 
 Joined: 14 Dec 2010
 Posts: 284
 
 
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				|  Posted: Sun Mar 18, 2018 12:31 pm    Post subject: Re: GPS antenna cable length |   |  
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				| Thank you Bud for sharing your experience. I take note of the idea of a metal plate under the antenna.
 Regards
 Remi[/quote]
 
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		| h&jeuropa 
 
 
 Joined: 07 Nov 2006
 Posts: 654
 
 
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				|  Posted: Mon Mar 19, 2018 8:42 am    Post subject: Re: GPS antenna cable length |   |  
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				| Remi,
 GPS antennas contain not only a GPS receiver but also an amplifier.  The length of coax is specified to reduce the signal strength to the proper level for the device processing and displaying the information, such as your G5.
 
 Jim Butcher
 
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		| rampil 
 
 
 Joined: 04 May 2007
 Posts: 870
 
 
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				|  Posted: Fri Mar 30, 2018 11:17 am    Post subject: Re: GPS antenna cable length |   |  
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				| I will put on my EE hat and surmise that the reason that Garmin
advises against chopping your cable is a simple one.
 GPS RF is on the north side of 1.5 GHz. Quality cable like RG400
 double braid is essential as is perfection in creating the tiny crimp
 connections.  If you do not have the equipment and expertise
 to do the work, don’t even try it. These are not your father’s
 PL-259/SO-239 radio shack connectors. A bad connection will
 have more attenuation than a few feet of RG400.
 
 The dc voltage to the preamp is not a relevent factor, as
 a rusty nail could carry that.
 
 Yes, I think we have all heard that trope about specific cable lengths.
 It is, IMHO, just marketing nonsense with no technical basis, since A) the
 lengths are no where near a tuned wavelength Feedline, and B) All
 modern receivers have AGC(automatic gain control).
 
 Full disclosure: I despise GARMIN avionics for their abysmal
 Human factors design and their absurd data pricing.
 
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 _________________
 Ira N224XS
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		| budyerly(at)msn.com Guest
 
 
 
 
 
 
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				|  Posted: Sun Apr 01, 2018 5:22 pm    Post subject: GPS antenna cable length |   |  
				| 
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				| Don’t sugar coat it Ira, 
I find it refreshing to use the Garmin as they are soooo intuitive:
 Here are some easy to use notes for you.
 
 Easy to use steps for Garmin 430 Navigation for nonprogrammers.
 Garmin 430 Changes to Nav Page
 Steps:
 Clear if not on the Primary Nav Page
 Menu Push to get on primary Page
 Large Knob Rotate to select desired data field
 Small Knob Rotate to select field desired
 Enter Press
 
 START ALL OVER AGAIN BECAUSE IT IS NOT THE DESIRED PAGE OR FIELD!
 
 To enter waypoint for Nav:
 Steps:
 FPL Press
 Small Knob Rotate to select Flight Plan Catalogue Page
 Enter Press
 Right Knob Rotate to select Create New Flight Plan?
 Enter Press
 Small Knob Rotate for number/letter
 Large Knob Rotate to select next letter/number
 Check correct input with proper ICAO catalogue
 Enter Press
 Repeat for next item,
 Repeat,
 Repeat
 Enter Press
 Check Flight Plan items for accuracy
 Menu Press
 Small Knob Rotate to select item Activate Flight Plan?
 Enter Press
 Are you sure?
 Enter Press
 
 RECHARGE AIRCRAFT BATTERY OR REFUEL AIRCRAFT AFTER COMPLETING NAV INPUT!
 
 Change a Frequency from the Memory is only seven steps:
 1) Turn the large right knob to select the WPT Page Group.
 2) Turn the small right knob to select the Airport Frequencies Page
 3) Press the small right knob to place the cursor on the airport identifier field desired.
 4) Use the small and large right knobs to enter the identifier of the desired airport.
 5) Press the ENT Key when assured the data request is correct.
 6) Turn the large right knob to highlight the desired frequency.
 7) Press the ENT Key to place the highlighted frequency in the standby COM Window field.
 
 PULL OUT FROM UNUSUAL ATTITUDE!
 
 
 Regards,
 Bud
 
 Sent from  Mail for Windows 10
 
 From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of rampil <ira.rampil(at)gmail.com>
 Sent: Friday, March 30, 2018 3:17:41 PM
 To: europa-list(at)matronics.com
 Subject: Re: GPS antenna cable length
 
 
 --> Europa-List message posted by: "rampil" <ira.rampil(at)gmail.com>
 
 I will put on my EE hat and surmise that the reason that Garmin
 advises against chopping your cable is a simple one.
 GPS RF is on the north side of 1.5 GHz. Quality cable like RG400
 double braid is essential as is perfection in creating the tiny crimp
 connections.  If you do not have the equipment and expertise
 to do the work, don’t even try it. These are not your father’s
 PL-259/SO-239 radio shack connectors. A bad connection will
 have more attenuation than a few feet of RG400.
 
 The dc voltage to the preamp is not a relevent factor, as
 a rusty nail could carry that.
 
 Yes, I think we have all heard that trope about specific cable lengths.
 It is, IMHO, just marketing nonsense with no technical basis, since A) the
 lengths are no where near a tuned wavelength Feedline, and B) All
 modern receivers have AGC(automatic gain control).
 
 Full disclosure: I despise GARMIN avionics for their abysmal
 Human factors design and their absurd data pricing.
 
 --------
 Ira N224XS
 
 
 
 
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