nuckolls.bob(at)aeroelect
Guest
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 Posted: Mon Sep 23, 2013 11:37 am Post subject: King KX145 pin out, pin 10 (OOPS! IMAGE CORRECTION) |
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| Quote: | | Quote: |
Got a KX145 reception problem in a homebuilt. (Nav not wired for use.)
Transmits beautifully, but only receives up to 1/2 mile.
Bench checked by a shop as AOK.
What is pin 10 on the P401 ? (The antenna is currently connected to ANT only.)
Feels like an antenna problem. Wondering about the unused pin 10... |
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SHOULD HAVE PUT THIS MESSAGE OFF UNTIL AFTER THE SECOND
CUP OF COFFEE THIS MORNING. HERE'S THE CORRECTED IMAGE
FOR THE TWO ANTENNA CONNECTIONS TO THE KX-145 . . .
[img]cid:.0[/img]
| Quote: | It appears that the KX145 is among the first generation
of Nav/Com transceivers wehrein the there is only one
receiver . . . you can either listen to a comm channel
or use it to navigate . . . but not both at the same time.
Later radios were 1-1/2 Nav/Comm indicating that there
is a full-up transmitter-receiver pair PLUS a separate
nav receiver.
The early nav/comms had two antennas too. The first
was the vertical 'whisker' for transmit only; the
second was the horizontal-V for receive only of
either comm or nav.
This explains the pin 10 connection which is the
center conductor of your receive coax. If you're
not connected to that pin, then receive performance
would be VERY poor.
If you don't plan to use the vor feature, then
you can install an antenna relay . . .
[img]cid:.1[/img]
. . . that is wired into your microphone
push to talk switch to let you receive on
the comm-whisker and transfer it to the
trasmitter during talk-time. |
Bob . . .
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