I haven't been in on this entire thread, but it seems to me he has a
sideband/mode switching issue. Here's why:
His rcv is OK....Question: Listening on LSB? What about other modes?
Question #2: No output. In what mode? Tune? CW? Different oscillator
frequency than the receive test?
I think he may have a problem with one of the crystals in the sideband
generator board, or possibly a trimmer or switching diode on that same
board, or on the Control board or Mode switch associated with
CW/Tune/LSB/USB.
Needs to run tests on other modes to check that out.
Phil C. Sr.
k4dpk
Phil C. Sr.
k4dpk
_________
----- Original Message -----
From: "Mike Bryce" <prosolar@sssnet.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, February 18, 2012 2:24 PM
Subject: Re: [TenTec] Some progress made! --Omni D low to no
power--CrystalFilter
> Scott,
>
> You see why that was such a head scratcher for me. Rick may have seen a
> filter go bad, but since TT uses the filter for rec and TX, and the rec
> worked just fine. There's something else (no kidding!) wrong.
>
> If the filter was open, then you'd need to be in the shadow of the W1AW
> tower to be able to hear much, if anything.
>
> When you subed in the 1.8 filter, that now points to something else beside
> a bad filter.
>
>
> Does the output on the TX mixer show short when you pull the board from
> the rig? It shouldn't
>
> however plug in the board and the output of the TX mixer goes to the
> bandpass filter. Here, the output of the TX mixer goes the bandpass input.
> On bands 7 mhz and up, the input of the bandpass board will show dc
> continuity. ( the output of the TX mixer goes into the input of the
> bandpass board)
>
> start looking for shorted cables, loose cable, the simple over looked
> things. Use that scope and unplug the TX mixer and see if the signal out
> of the filter pops up, or stays the same.
>
> Keep the group informed
>
> mike, wb8vge
>
>
>
> On Feb 18, 2012, at 2:02 PM, Scott Sheppard wrote:
>
>> So the next stage of the problem would seem to be finding out why teh
>> crystal is baving linke it is...here is the situation:
>>
>> 1. Normal filter left in place
>>
>> -great receive, no problem...
>> -virtually no output at all (as has been beat to death already)
>>
>> 2. Filter removed and jumpered with a .01 capacitor
>>
>> -wide open receive as expected, lots of signals
>> -full power TX at all the stages...100 watts out
>>
>> 3. 1.8 khz filter fitted
>>
>> -receive ok albeit narrower
>> -virtually no TX power at all (as per situation #1)
>>
>>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|