[Boatanchors] W2EWL VFO range?

[D C *Mac* Macdonald]

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
> 
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