[Elecraft] K1-4 Low power output only on 15 meters.

[Don Wilhelm]

Jim,

Either you have a weak 15 meter crystal, or the bandpass filters are not 
properly peaked on 15 meters.
Do you have an RF Probe or a 'scope?  If so, measure the RF voltage at 
P1 pin 6 on the 4 band board.  It should be greater than 70 mV rms or 
200 mV peak to peak.  You can do a preliminary peaking of the pre-mixer 
bandpass in receive while monitoring the RF voltage at this point.

Be certain you are tuning to 15 meters instead of at a higher frequency 
- do the initial peaking during receive while listening to a known 15 
meter signal.  If you do not have a signal generator, use another 
transmitter operating into a dummy load and place the end of a 'hunk of 
wire' antenna close to the dummy load.

On the suspicion that there is some other problem in the RF transmit 
chain limiting the output to 2 watts, do the transmit peaking at 1 watt 
instead of 2 watts.  If the power goes up to 2 watts during the process, 
exit TUNE and reenter to bring the power back down to 1 watt and 
continue to try to find the peak.

73,
Don W3FPR

On 6/11/2013 11:58 PM, Jimithy66 wrote:
> My K1 was a wonderful radio on all bands 40 - 17m.
>
> However 17m saw very little use and 15m was desired..
>
> The 26.050 crystal was replaced with the kit supplied 29.000 MHz
>   crystal for 15m and the K1 realigned on all bands.
>
> All seemed to go well with the receive and transmit alignment
> with the power level set to 2 watts per the manual.
>
> However now the power will not go above 2 watts on 15m..
>
>   All bands go to 5 watts measured on a WM-2 watt meter
> but on 15m the output stops at 2 watts..
>
> 15m programs OK from 0.2 to 2.0 watts output but not higher.
>
> The K1 display reads 5.0 when being set with buttons but
> the K1 power output display reads only around 2.1 or so watts.
> .
>    All frequencies are correct on another receiver.
>
> Am I missing something ?  Any help would be appreciated.
>
> Thank you , 72/73
>
> Jim / W1FMR
>
>
>
>
>
>
>
>   .
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