Harvey,
I found that I could adjust the VCO voltage to keep the VCO in lock at
5MHz -- however, I have yet to copy WWV at 5MHz. And, I did get that
'buzz saw' sound when the VCO is not in lock. Good luck -- if you
find you can copy WWV at 5M, please let me know about it.
Mark
On 5/30/06, Harvey Howell <[EMAIL PROTECTED]> wrote:
Thanks Don. I think the VCO voltage is too low at 5000kHz. At 5300 kHz it
reads 1.084 vdc on my Fluke 179. I will have to go back to the adjustment
routine in the K2 manual and see if I can shift all the voltages enough. On
my previous K2 it worked great at 5000kHz. The buzz saw sound to me is like
hearing some internally generated low frequency and nothing else. The
frequency changes a little bit when I attach the DMM lead to R30. Thanks for
your help.
Harvey KN6VP
----- Original Message -----
From: "Don Wilhelm" <[EMAIL PROTECTED]>
To: "Harvey Howell" <[EMAIL PROTECTED]>;
<elecraft@mailman.qth.net>
Sent: Tuesday, May 30, 2006 7:23 AM
Subject: RE: [Elecraft] K60XV Problem
> Harvey,
>
> Re-check the VCO range (voltage on the left end of R30), and be certain
> all
> the ands fall within the proper range. It is normal for the VCO voltage
> to
> become so small below 5300 kHz that the tuning will not continue on down
> to
> 5000 Hz. Also the response of the bandpass filter may fall off quite a
> bit
> at 5000 Hz which will reduce the ability to hear at that frequency.
>
> I cannot speak to your 'buzz-saw' - you will have to be more specific.
>
> 73,
> Don W3FPR
>
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] Behalf Of Harvey Howell
>> Sent: Tuesday, May 30, 2006 9:53 AM
>> To: elecraft@mailman.qth.net
>> Subject: [Elecraft] K60XV Problem
>>
>>
>> Hello everyone. I installed a 60 meter board last night and it
>> seems to have a problem. When I entered 5000 kHz I had what
>> sounds like a loud oscillator sound on the audio. I turned on
>> another radio and had WWV loud and clear at 5000 kHz in that
>> radio. When I increase the frequency the oscillator sound goes
>> away (maybe just beyond my hearing) and I hear a very faint sw
>> station at 5070 kHz. Between 5070 kHz and 5300 kHz I can't hear
>> the buzz saw and I adjusted the trimmers for max power out. I'm
>> not getting any error messages on the display. So far I haven't
>> found any visible assembly errors. Has anyone had this problem
>> before? Any ideas what might be bad? On a previous K2 I built
>> with this option I heard WWV right away at 5000 kHz. Thanks very much.
>>
>> Harvey KN6VP
>
>
>
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>
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