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
|