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I'm Stumped- need some help from the group

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Bob & Debbie Fish

I'm Stumped- need some help from the group

Hi Guys,
I was up late last nite trying to solve this thing and failed, it really
has me stumped. It may be obvious to one of you guys that know the radio
better than I. Here goes:

Last weekend, I made some ssb contacts in the WPX contest and all was
well. Good signal reports and my audio was reported in good shape as
well. Then on Tuesday I attempted to check in to a local 80 meter net
and after several attempts with no responders. A guy comes on and says,
"Hey K6GGO, your 500 Hertz high, check your RIT". Well, I checked my RIT
and my XIT and they were both off. So after messing with this thing all
week I am throwing up my hands and asking for help.Here is the data I've
collected:

1) I performed Wayne's procedure for adjusting the 4 mhz master
oscillator (C22). After I adjusted C22, I zero beat WWV and the display
reads 10000.53

2) I measured the output frequency of the transmitter with my frequency
counter and it matches the displayed frequency.

3) Last night I quickly went through the Pll reference oscillator range
test, VCO test, VCO alignment, BFO test, and then ran the VFO
linearization. Still no Joy!

4) Both the xit and rit appear to be working normally and are off.

5) Both VFO's are set for the same frequency and are not set for split
operation.

Its as if the receiver and the transmitter are operating on different
frequecies 500 hz apart (receiver lower) and the display shows only the
transmitter frequeny.
I hope this makes sense!
This is probably going to be a button or something in the wrong position
causing me endless embarassment.

What do you guys think?

Thanks for the bandwidth,

Bob K6GGO
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dave.wilburn

Re: I'm Stumped- need some help from the group

Have you used Spectrogram and gone through your CAL FIL? That is where
I found my frequency shift issue. Take a look at the procedures here.

http://www.n0ss.net/k2_filters_using_gram_v5r17.pdf

David Wilburn
[hidden email]
K4DGW
K2 #5982

Bob Fish wrote:

> Hi Guys,
> I was up late last nite trying to solve this thing and failed, it really
> has me stumped. It may be obvious to one of you guys that know the radio
> better than I. Here goes:
>
> Last weekend, I made some ssb contacts in the WPX contest and all was
> well. Good signal reports and my audio was reported in good shape as
> well. Then on Tuesday I attempted to check in to a local 80 meter net
> and after several attempts with no responders. A guy comes on and says,
> "Hey K6GGO, your 500 Hertz high, check your RIT". Well, I checked my RIT
> and my XIT and they were both off. So after messing with this thing all
> week I am throwing up my hands and asking for help.Here is the data I've
> collected:
>
> 1) I performed Wayne's procedure for adjusting the 4 mhz master
> oscillator (C22). After I adjusted C22, I zero beat WWV and the display
> reads 10000.53
>
> 2) I measured the output frequency of the transmitter with my frequency
> counter and it matches the displayed frequency.
>
> 3) Last night I quickly went through the Pll reference oscillator range
> test, VCO test, VCO alignment, BFO test, and then ran the VFO
> linearization. Still no Joy!
>
> 4) Both the xit and rit appear to be working normally and are off.
>
> 5) Both VFO's are set for the same frequency and are not set for split
> operation.
>
> Its as if the receiver and the transmitter are operating on different
> frequecies 500 hz apart (receiver lower) and the display shows only the
> transmitter frequeny.
> I hope this makes sense!
> This is probably going to be a button or something in the wrong position
> causing me endless embarassment.
>
> What do you guys think?
>
> Thanks for the bandwidth,
>
> Bob K6GGO
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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Don Wilhelm-3

Re: I'm Stumped- need some help from the group

In reply to this post by Bob & Debbie Fish

Bob,

Changing C22 will not change anything in the K2 dynamically, it only
changes the frequency of the 4 MHz reference oscillator. The reference
oscillator is only used for calibration during a run of CAL PLL and CAL FIL.

You must do more - you must make the K2 enter new values in the EEPROM
before any of the K2 frequency display changes - here is how to do that.

After accurately setting the 4 MHz reference oscillator, run CAL PLL to
completion, and then run CAL FIL - you must cycle through EACH of the
BFO settings for each of the modes (USB, LSB, CW, CWr and if set on also
RTTY and RTTYr). For each BFO, make note of the current setting, then
change it up or down and then set it back to whatever it was to start
with - the 'change' will force the new DAC values to be entered into
EEPROM, sorry, but there is no global way to do this EEPROM write, it
must be forced for each BFO, but it only takes a short time to cycle
through all of them.

After you have completed those steps, your K2 dial should read correctly.

73,
Don W3FPR

Bob Fish wrote: