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aaaron(at)tvp.com.au
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 Posted: Tue Mar 20, 2007 2:23 am Post subject: Progressive loss of radio quality |
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My friend has a cozy (fibreglas construction) with an icom a200 (i think) tranceiver. When he transmits the initial quality is good but if the transmission continues for many seconds it degrades to the point of being unreadable. Is this likely to be an antenna grounding issue, a factor related to it being a glass plane or a fault with the radio? Any thoughts appreciated.
allan
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nuckollsr(at)cox.net
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| Posted: Tue Mar 20, 2007 5:21 am Post subject: Progressive loss of radio quality |
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At 09:22 PM 3/20/2007 +1100, you wrote:
| Quote: |
My friend has a cozy (fibreglas construction) with an icom a200 (i think)
tranceiver. When he transmits the initial quality is good but if the
transmission continues for many seconds it degrades to the point of being
unreadable. Is this likely to be an antenna grounding issue, a factor
related to it being a glass plane or a fault with the radio? Any thoughts
appreciated.
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if it has anything to do with local RF getting back
into the radio, a dummy load check will show this up.
Put this device on the transceiver's feedline.
http://www.aeroelectric.com/Pictures/Tools/DummyLoad.jpg
Listen on adjacent airplane or handheld while transmitting
on subject radio. If the problem goes away when the antenna
is out of the loop, then the investigation will focus
outside the radio.
Is this a new condition or has it existed since day-one?
Bob . . .
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N6030X(at)DaveMorris.com
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| Posted: Tue Mar 20, 2007 5:36 am Post subject: Progressive loss of radio quality |
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It could be that the SWR on the antenna is so high that the
transmitter is protecting itself by reducing power. I don't know
about the A200 but a lot of modern transmitters have that
feature. Make sure all connectors are good and that the coax isn't
shorted somewhere.
Dave Morris
At 05:22 AM 3/20/2007, you wrote:
| Quote: |
My friend has a cozy (fibreglas construction) with an icom a200 (i
think) tranceiver. When he transmits the initial quality is good but
if the transmission continues for many seconds it degrades to the
point of being unreadable. Is this likely to be an antenna grounding
issue, a factor related to it being a glass plane or a fault with
the radio? Any thoughts appreciated.
allan
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http://www.matronics.com/Navigator?AeroElectric-List |
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