[Boatanchors] W2EWL VFO range? New Question

[David C. Hallam]

Sine the topic is phasing SSB rigs, I am going to ask for ideas with a 
Johnson Pacemaker I am refurbishing. Johnson went a different route in 
the Pacemaker. The SSB signal was generated at a different frequency on 
each band and then mixed with Johnson's standard vfo, 3-3.5 MHz.

My problem lies in the RF phasing circuit. On some bands, particularly 
40 & 20, I am getting harmonic output from the crystal oscillator. On 40 
the oscillator is 4 MHz and 20 is 11 MHz. Each of the 5 crystal 
oscillators has its own tuned circuit, slug tuned coil and capacitor. 
Johnson says to tune each oscillator to maximum output OR 1.5V RF 
whichever is less.

With the harmonic content of the oscillator, I can not get the required 
90 degree phase shift. for the balanced modulator. The coils and 
capacitors are a bear to get to and I have not measured the inductance 
or capacitance of the components. I have tried different crystals.

Ideas?

David
KW4DH

On 3/22/2011 12:31 PM, Robert Nickels wrote:
> On 3/22/2011 10:48 AM, D C *Mac* Macdonald wrote:
>> 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).
>>
> These basic phasing rigs are a great learning experience and I have to
> admire you guys who tackled such a project back in the Eisenhower era!
>
> 73, Bob W9RAN
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