Hmmm, I guess the instructions below weren't very clear.
The TX driver board's output is over a piece of RG-174 coax with an RCA
Phono plug on the end. It plugs into the input of the final amp (PA) board.
The PA's output is also a coax with an RCA Phono plug and it plugs into the
input of the LPF board.
Simply unplug the PA's plug from the LPF board and tape it with electrical
tape so that it cannot create a short circuit, then unplug the driver cable
from the input of the PA and plug it directly into the LPF board.
Just in case someone decides to use the radio like this for an extended
period of time, you should also unsolder the thick red wire that supplies
the PA with +13vdc (and tape it). That way it won't draw idle current when
in TX.
This actually makes a very nice QRP transceiver!
However, most likely as Jim pointed out, the problem is overdriven audio.
Does the mic gain have any effect on the output power at all?
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Rick -
DJ0IP / NJ0IP
Sent: Saturday, April 04, 2015 10:11 AM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] 540/Triton Transmit Audio Distortion
Bill,
The 540 has an interesting feature.
You can unplug the coax coming from the driver and plug it directly into the
Low Pass Filter. (Of course 'after' unplugging the coax from the finals from
the LPF board).
When you do this, you have a 5w QRP radio.
Try that. This will show you immediately if the trouble is in the final amp
or in one of the earlier stages.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Bill Acito
Sent: Saturday, April 04, 2015 7:42 AM
To: TenTec@contesting.com
Subject: [TenTec] 540/Triton Transmit Audio Distortion
My restoration project continues...
My project 540 has great receive audio, but very distorted transmit audio,
as if it was being overdriven. Power out into a dummy loadlooks good, but on
another receiver I can hear the audio peaks of myvoice but the audio itself
sounds like hash, severely distorted -- like modulated static.I find that if
I move the mic away from my mouth 12-18 inches andspeak low the audio sounds
acceptable on the other receiver.
I have tried a 700 hand mic and a high z Turner 350C with no difference.
What boards should I be looking at? the SSB generator? Finals?
Bill W1PA
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