Excellent observation.
----- Original Message -----
From: "Mike Bryce" <prosolar@sssnet.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, February 18, 2012 10:42 AM
Subject: Re: [TenTec] Some progress made! --Omni D low to no power
Scott, Rick,
Good going Scott...
Now, I'm just wondering here. Like Rick, I thought at once the crystal
filter was fubar. Then I sat back and tried to remember when the last time
I saw a bad filter when doing all the repairs I've done.
That's NOT saying that they don't go bad. I didn't believe in Big Foot
either, until I married his sister. But that's another story when the kids
go to sleep.
They do go out of specifications.
However, if the filter was (is?) open, then there would be no receive as
the filter is in the receive chain. An open filter would have killed the
receiver.
The receiver is working correctly right?
If you have the optional 1.8khz filter, swap it with the suspect one.
yeah, it's way too tight for ssb, but it will work. Or if you don't have
it, use the .01 jumper Rich mentioned.
Scott,
if you're seeing a dc short to ground on the TX mixer OUTPUT there's a red
flag. A bucket of them as a matter of fact. The output is capacitor
coupled. The INPUT to the TX Mixer WILL be at DC ground.
On the LLD, the output will show a DC short to ground and the INPUT should
not.
Now the inputs and outputs are run through the bandpass filter board and
the tuned circuits are at DC ground. You MAY be seeing those when you
checked. Flip the band switch to either 160 or 80 meters as though
sections of the bandpass filters are NOT at dc ground and check the input
and output of the TX Mixer and LLD
Keep us posted..
mike, wb8vge
On Feb 18, 2012, at 6:59 AM, Rick - DJ0IP / NJ0IP wrote:
BRAVO Scott, you are getting close.
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|