Re: Voltages for Q5 and U8?

Posted by Don Wilhelm-4 on
URL: http://elecraft.85.s1.nabble.com/Voltages-for-Q5-and-U8-tp6825928p6830131.html

The problem will be found either in the bandpass filter on the left end
of the 2 band board, or in the connections between the filter board and
U7  Check the path between U7 pin 4 and the filter board P1 pin 2 and
also between U7 pin 5 and filter board P1 pin 1 - both should have close
to zero ohms resistance.

If that is not the problem, check the capacitor values for C1 through
C10 on the board against the band components chart.

You might check for continuity between the junction of C4 and C5 when
the band is set to Band1 and between the junction of C9 and C10 when set
for Band2 - the relays are latching, so you can set the band and then
remove the filter board to check for continuity.

Do you have the same problem on both bands?  If so, it is probably a
connection problem.  On only one band, I would suspect a wrong component.

73,
Don W3FPR

On 9/25/2011 2:20 PM, K7MH wrote:

> It is the two band board with 40 and 20 meters.
> I have looked over the filter board several times and re-soldered some
> joints just to be sure.
> I will look over it again.
> I used the pre-wound coils but will look them over again and make double
> sure the right one is in the right place.
>
> --
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