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1. 03:25 PM - SL30/SL40 transmit/receive lockout? (Troy Scott)
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| Subject: | SL30/SL40 transmit/receive lockout? |
--> Avionics-List message posted by: "Troy Scott" <tscott1217@bellsouth.net>
Gentlemen,
I'm about to install an Apollo SL30 nav-com and an Apollo SL40 com into the
same panel using no audio panel. The plan is to use Bob's AeroElectric
Audio Isolation Amplifier and a transmit selector switch labeled Transmit
SL30 / Transmit SL40. I can't find anything in the installation manuals
about a transmit/receive lockout feature to shut off the receiver in one
while the other is transmitting. I'm concerned about this because I read in
the instruction manual for a radio of a different brand (ICOM A200) that
when using two in the same airplane (even with separate antennas) this
transmit/receive interconnect must be accomplished in order to avoid damage
to the receiver sections of the radios. Shed some light here, please!
I spoke with a fellow at GarminAT tech support. He said he knew of no such
feature in these units. Even after I stressed that my concern is for the
receiver sections of the units, he indicated that the problem being
addressed in the ICOM A200 manual is probably related to possible audio
feedback and that audio feedback can somehow expose the OTHER radio's
receiver section to damage?!?!???. However, I'm still confused and
unconvinced. How can AUDIO isolation of the two units protect the RECEIVER
section of one radio from the radiated energy from the other radio's
transmitter?
Regards,
Troy Scott
tscott1217@bellsouth.net
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