Re: {Collins} KWM-2



A simple notch filter at the receiver input tuned to approx 9500 should be
sufficient h to completely eliminate your problem.

Denny AE6C

On Sat, Jun 13, 2009 at 2:13 PM, W9HAK <W9HAK@xxxxxxxxxxxxx> wrote:

> richard pumphrey wrote:
>
>> I have a query regarding 40 meter night time reception.  I appear to be
>> getting an image at night.  Careful turning of the exciter turning gets rid
>> of most of it, but it still is in the background.  Is this normal?  If not,
>> how can I fix it?  Otherwise, good receiver and transmitter.   Richard
>> wn9ddv
>>
>>
>>      _______________________________________________
>> SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
>> http://www.collinsradio.org/membership/
>>
>>
>>  NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
>>  SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
>>  1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
>>  ------------------------------------------------------------------------
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database:
>> 270.12.67/2173 - Release Date: 06/13/09 05:53:00
>>
>>
>>
> Hello Richard,
>
> My 75S3 receiver also has a low level heterodyne on 40 meters. I have
> tracked it to a short wave station in Florida. The frequency is 9505 khz,
> and this is passing through the receiver and mixing with the 40 meter
> crystal output to the first mixer. From here it passes through the rest of
> the receiver and is heard as a faint note.
>
> Go to   http://en.wikipedia.org/wiki/WYFR   and scroll down to
> frequencies. Look for 9505 khz and check the time schedule.
>
> Tuning the pto has no effect on the heterodyne, in fact you can pull the
> 6AU6 and the heterodyne is still present. This station has a 100,000 watt
> output. It goes off the air at 11:45 pm CTD and presto the heterodyne is
> gone.
>
> Detuning the preselect reduces the level but it also reduces the desired
> signal.
> With the narrow cw filter, 200 cps, it is very noticeable so I try to stay
> in the wider passband. Try listening just as they are going off 9505 khz and
> see if your problem also goes away.
>
> I don't know how S Line users near them can operate on 40 meters if the
> signal is so strong in Indiana it passes through various tuned circuits.
>
> Smith Bradford
> W9HAK
>
> _______________________________________________
> SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> http://www.collinsradio.org/membership/
>
>
> NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
>  SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
>  1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
>
>






This archive was generated by a fusion of Pipermail (Mailman edition) and MHonArc.