[TenTec] Some progress made! --Omni D low to no power

[Rick - DJ0IP / NJ0IP]

Mike,

I've seen crystal filters go bad a few times.
It is possible that even with a bad filter there might be enough leakage
around the filter to still hear something in the speaker.

The Triton did not have a second filter option.
There is only one.

I wish the broken Trition I bought for 80 bucks had only had a broken Xtal.
Mine had a blown final.
It never advanced beyond the stage of a 10w QRP rig.
It was a great rig for running off of batteries in emergencies.

I left it and the tornados behind in Oklahoma when I moved back to Germany
last year.

73
Rick, DJ0IP


-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Mike Bryce
Sent: Saturday, February 18, 2012 5:42 PM
To: Discussion of Ten-Tec Equipment
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.
> 

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