[Boatanchors] W2EWL VFO range?

[Jim]

This thread got me traveling down memory lane.
I had a CE-20A+BC-457VFO in the early 70's.
Curiosity got me and I went to the BAMA site to refresh the ole gray cells 
on the frequency multiplier scheme in the VFO.

The station band change procedure was as follows:
Set the 75A3 to correct band/Frequency.
Select the bans switch on the VFO
Crank the VFO tuning dial to the approximate frequency
Set the band switches on the 20A
Turn off the HV to the amp.  (PP 811A's)
Change the grid coil.
Change the Plate coil.
Switch in the dummy load.
Tune the CE 20A
Tune the amplifier.
Select an antenna
Tune the open wire tuner.

WHEW!!!!!!

Hope the DX station is still there.....

Jim






>
> SSB signal generated at 9 MC/s and BC-457's VFO covered 4.0 - 5.3.
>
> Single conversion could theortically cover 3.7-5.0 with a subtraction
> mixing scheme and 13.0 - 14.3 by using an addition mixing simply
> by tuning the final (IIRC).
>
> Practically, 5.0 - 5.3 gave 80m coverage of 4.0 - 3.7. Note the
> reversal of tuning direction.
>
> On 20m, 5.0 - 5.3 gave coverage of 14.0 - 14.3.
>
> I suspect that the problem of 3rd harmonics is a result of the
> builder using too much L in the output tank and not enough C
> resulting in Q that is too low.
>
>
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * Oklahoma City, OK *
> * USAF, Ret (61-81) *
> * * * * * * * * * * *
>
>
>
>
>
>
>
>> From: james.liles at comcast.net
>> To: boatanchors at mailman.qth.net
>> Date: Tue, 22 Mar 2011 08:09:04 -0700
>> Subject: [Boatanchors] W2EWL VFO range?
>>
>> Hi Bob:
>>
>> What was the heterodyne scheme used with the W2EWL --- what was the VFO
>> range? Kindest regards Jim K9AXN
>>
>> Message: 8
>> Date: Mon, 21 Mar 2011 22:20:32 -0500
>> From: Robert Nickels <ranickel at comcast.net>
>> Subject: Re: [Boatanchors] OT: Ignorance :))
>> To: boatanchors at mailman.qth.net
>> Message-ID: <4D881580.4040203 at comcast.net>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> On 3/21/2011 9:24 PM, D C *Mac* Macdonald wrote:
>> > Carl, I also started with the W2EWL "Cheap
>> > and Easy S.S.B." rig that I built in 1962
>> >
>> You can take a look at mine and even hear some audio from it (albeit a
>> little off-frequency) here:
>>
>> http://www.vintagessb.net/w9ran.htm#cheap
>>
>> Scroll down to the bottom of the page. I had a lot of fun finishing it
>> up and getting it going, but have not been able to overcome 3rd harmonic
>> VFO problems on 20 meters, thus it's working on 75 only at this time.
>> While there are compromises, I give Anthony Vitale a lot of credit for
>> turning the Dome/Norgaard design into a practical transmitter that could
>> be built by lot of average hams (and was!)
>>
>> 73, Bob W9RAN
>>
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html