K2 Cal

[kd1na]

Nick,

I know you got many responses to your question about frequency calibration on the K2.

I just wanted to give you my slant on this.

When I calibrated my K2, I set up the K2 as a counter. On the tip of the counter jumper cable you built, wrap a little piece of bare wire around the banana plug and attach a clip lead to that wire. Plug the cable (along with wire and clip lead into your VCO output test jack on the RF board. Connect the other end of that clip lead to an external frequency counter.

Note the frequency readout on the counter (the actual readout frequency is not critical) and adjust C22 on the Control Board so the K2's frequency counter's readout is exactly the same as the  external counter. Your adjusting the time base on the controller board to match that of the external counter.

Remove the clip lead and wire but leave the counter jumper wire connected to the VCO test jack. Put your K2 on the 7 MHZ band and Run VCO Cal.
When the VCO Cal is completed, run the calibrations for your BFO offsets and if that external frequency counter was working correctly you will be dead on frequency.

Hope this is not too confusing Nick.

73
Dave KD1NA
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[Bob P-2]

Saw a article in FISTS news letter about mods for a K1, Changing USB to LSB,
Does any one have comments if this works and why do it ??.

Mod is remove RFC1 and jumper it, then realign BFO

Bob KC8IPQ

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[Sam Morgan]

Bob P wrote:
>
> Saw a article in FISTS news letter about mods for a K1, Changing USB to
> LSB,
> Does any one have comments if this works and why do it ??.
>
> Mod is remove RFC1 and jumper it, then realign BFO
>
In the article I believe Harry explains his reason for doing this. First note
that he is a JL3 so his band conditions I'm sure aren't the same as here in
Texas. <g>

But for his usage he says the USB to LSB change allows him to "listen to phone
QSO's on high-bands to know how propagations are good or not. And he can be
active on his favorite 12-meter."
--
GB & 73's
KA5OAI
Sam Morgan
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[Don Wilhelm-3]

Bob,

I guess it is worth a try if you really want to do that.  The BFO
frequency must change to the other side of the IF.

One reason I can see for changing USB to LSB is to change the pitch of
the received signal note as you tune upward in frequency.  With USB, the
pitch decreases as you tune upward, and with LSB it increases.
Whichever is better is a personal preference, and some folks don't
really care.  If you are one who does not care, then I suggest that you
leave well enough alone.

73,
Don W3FPR

Bob P wrote:

>
> Saw a article in FISTS news letter about mods for a K1, Changing USB to
> LSB,
> Does any one have comments if this works and why do it ??.
>
> Mod is remove RFC1 and jumper it, then realign BFO
>
> Bob KC8IPQ
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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> Elecraft web page: http://www.elecraft.com
>

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