new K1: no transmit on Band 2

[WB0OEW]

Hello everyone,

I am building a K1, 2 band model, 40 and 15m. VFO and Receiver alignment went smoothly on both bands, seems to be a
nice receiver. Transmit alignment went fine on Band 1, measured full 5W to dummy load. But no joy on Band 2. OUT is
set to 2.0 watts but pressing TUNE mode shows P0.1 always. WPM+ and WPM- has no effect. No power at all measured at
dummy load.

Again: receive OK both bands, xmit ok band 1, no power out on band 2.

Suggestions most appreciated.

Thanks in advance.

73,

Elwood Downey, WB0OEW, Socorro NM


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[Don Wilhelm-4]

Elwood,

First thing to try is to listen for the Xtal oscillator in a receiver
that can tune to 26 MHz.  If the xtal is not oscillating, there is not
much chance that it will either receive or transmit on 15 meters.  
Connect a short antenna to the receiver and place the end close to th
eleft side of the 2 band board.

If the xtal is oscillating, next check the receive for 15 meters. (if
the xtal does not oscillate, fix that first)
Are you certain the receive is actually on 15 meters?  Find a 'weak
signal' that you know is at 15 meters and do the receive alignment first
to get the pre-mix bandpass filter and the RF bandpass filter to their
approximate correct positions, and then try the transmit  alignment again.

If you do not have a real signal generator, you might have a transmitter
that can transmit into a dummy load - attach a short antenna to the K1
and put it in the vicinity of the dummy load with the other transmitter
producing the 15 meter signal.

I hope that helps.  If not, get out your RF Probe (or 'scope) or build
one from the schematic in the K1 manual appendix (Elecraft sells an RF
Probe kit for $10).  The with the RF Probe in hand, follow the steps in
the Transmit Signal Tracing section in the back of the K1 manual.  That
will isolate the problem to the failing stage.

73,
Don W3FPR

Elwood C. Downey wrote:

> Hello everyone,
>
> I am building a K1, 2 band model, 40 and 15m. VFO and Receiver alignment went smoothly on both bands, seems to be a
> nice receiver. Transmit alignment went fine on Band 1, measured full 5W to dummy load. But no joy on Band 2. OUT is
> set to 2.0 watts but pressing TUNE mode shows P0.1 always. WPM+ and WPM- has no effect. No power at all measured at
> dummy load.
>
> Again: receive OK both bands, xmit ok band 1, no power out on band 2.
>
> Suggestions most appreciated.
>
> Thanks in advance.
>
>  

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[WB0OEW]

Hi Don,

Thanks for the reply. I traced until I found good signal entering RF-J7-1 but almost nothing coming out RF-J7-8. I saw
nothing obviously wrong but reheated all the pins to K2 and the surrounding caps. Now everything is running fine. I
must have been optimistic thinking receive was working too.

73,

Elwood


On Mon, July 21, 2008 8:50 am, Don Wilhelm said:
> I hope that helps.  If not, get out your RF Probe (or 'scope)
>
> Elwood C. Downey wrote:
>> Again: receive OK both bands, xmit ok band 1, no power out on band 2.

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