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10-06-2010, 06:21 PM
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Join Date: Jun 2007
Location: Rhode Island
Posts: 937
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Radio Ops Without Antenna Connected
Just finishing up panel wiring, but without wings on yet, some antennas are not yet connected. Is there any risk to running radios without all antennas connected? I'm not talking about transmitting here, just powering the radios on and checking local interfaces with ARINC & EFIS, etc. I checked Garmin's documentation and couldn't find anything about this. Just want to make sure that this isn't "so obvious" that they don't even list it (yeah right)!
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Highest Regards,
Noah F, RV-7A
All men dream, but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men? for they may act their dream with open eyes, to make it possible. -T.E. Lawrence
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10-06-2010, 06:25 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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I am no expert, but as I understand it, as long as you do not transmit, it should not be a problem----at least to the radio.
Dont know how the rest of the little magic boxes of electrons will react.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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10-06-2010, 06:48 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Right
No problem running the radios without antenna.
Do NOT, however, key the transmitter without the antenna. That can blow the output power section.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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10-06-2010, 07:05 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,667
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As long as the 330 is not the ES model it's ok, but keep it in stby anyway.
Everything else should be ok, make sure you know how to recognize if the comm is transmitting in case you have a "stuck mic" situation.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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10-06-2010, 07:14 PM
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Join Date: Sep 2010
Location: Airdrie AB Canada
Posts: 172
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Quote:
Originally Posted by Noah
Just finishing up panel wiring, but without wings on yet, some antennas are not yet connected. Is there any risk to running radios without all antennas connected? I'm not talking about transmitting here, just powering the radios on and checking local interfaces with ARINC & EFIS, etc. I checked Garmin's documentation and couldn't find anything about this. Just want to make sure that this isn't "so obvious" that they don't even list it (yeah right)!
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Powering on your radio will not have any ill side effects on your system. But, as stated in the previous post do not transmit. The radio wave will be reflected back to your transceiver and cause serious damage. Better off to connect your antenna just as a precaution in case of a stuck ptt. |
10-06-2010, 07:41 PM
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Join Date: Jun 2007
Location: Rhode Island
Posts: 937
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Good point on the stuck mic, guys. I will definitely connect my com antenna temporarily, "just in case". Appreciate the quick responses.
__________________
Highest Regards,
Noah F, RV-7A
All men dream, but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men? for they may act their dream with open eyes, to make it possible. -T.E. Lawrence
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10-06-2010, 07:42 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,667
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Actually most modern low power comms (10W) are relatively immune to the output damage caused by an open antenna, not recommended mind you but chances are no damage will result from short term transmitting with an open antenna. On "Vintage" radios transmitting into an open antenna could certainly fry the output if done for to long.
The higher the power the more likely the damage, it can still be a problem on higher power (20W+) comms. The 330 for instance is 250W output, it can be damaged rather quickly if the antenna is not there, so keep it in stdby just to be sure it's not talking to anyone.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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