[Elecraft] I'm Stuck!

Mon Jan 6 21:41:07 2003

Tks Roy.  Ugg on L33 -- L33 is a bear!  Mine came pre-wound.  I went and
bought a low-end frequency counter today (brand is bellMerit, and it has a
20Mhz counter as well as other multimeter functions) but the resolution is
not good enough and the frequency bounces between 11.98 MHz and 12.10 MHz,
and I found that the position probe leads (standard multimeter type probe
leads) affects the reading, and also when I put the probe on TP3 the
frequency readout on the K2 goes down!  So I am going to take it back.

They also had a frequency counter of the type that has a BNC connector on
it; a hand-held model that goes up to 1.3GHz.  Do you happen to know if I
can use that instead? Maybe make a probe for the BNC connector like I made
for the control board with the 10pf cap near the tip?  The counter is
about twice as much.

73, Martin

> Nope, no answer. I going to call Elecraft later this week and get an
> answer from them. I don't thinks it's the 4mhz because I tinkered with
> the settings on that and still couldn't get within specs. Calibrated to
> WWV after that and no luck. I think L33 is the culprit. Will let you
> know what I find. Roy
>
> -----Original Message-----
> From: Martin Crundall [mailto:[email protected]]
> Sent: Monday, January 06, 2003 3:28 PM
> To: [email protected]
> Cc: [email protected]
> Subject: Re: [Elecraft] I'm Stuck!
>
>
> Roy;
>
>    Did you get an answer to this?  I didn't see one from the list --
> maybe
> they sent an answer direct to you?
>
>    I am building K2 #3021 and have EXACTLY the same readings -- a 3.39
> gap.  I don't have an external frequency counter so can't calibrate the
> 4mhz oscillator, so I put it down to that and I'm plowing on.  But if
> it's an indication that I've done something wrong, I'd prefer to fix it.
>  I'm going to pick up a frequency counter at Abletronics today.
>
>    73, Martin
>
>> Hi,
>> I am in the process of building my k2, sn 2884 and have reached the
>> final alignment and test. I decided it was a good time to install the
>> stability mod so that's what I did. After doing so, I ran the CAL FCTR
>> and that's where I ran into problems. Before mod: 4916.94 - 49.26 =
>> 4.48; after mod 4917.12 - 4913.73 = 3.39. I added an 82pf cap across
>> c174 and the result was 4917.08 - 4913.35 = 3.73,not much improvement.
>> I added a 200pf (max size recommended) and I get
>> 4917.00 - 4913.27 = 3.73. I calibrated the internal counter to WWV and
>> am confident
>> that it's right on. I've rechecked the component values and they're
>> correct and I marked the old xtals when I removed them so I know
>> they're not back in the circuit. Any ideas guys??? Could I take my old
>> L33 toroid and wind a higher inductance coil?
>> thx
>> Roy Vickers
>>
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