[Boatanchors] W2EWL VFO range?

Tue Mar 22 13:06:12 EDT 2011

I have the manual for a Meissner 150B.  Pub US Signal Corp 1942.
To my surprise the output tank circuit for the 813 final is a true Pi-net.

Thanx
Lloyd Godsey KK7IZ
kk7iz at cox.net
480-620-7145
http://www.antiqueaircraftradios.com/
http://www.antiqueradioarchives.com/

-----Original Message----- 
From: Carl
Sent: Tuesday, March 22, 2011 9:44 AM
To: Jim ; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] W2EWL VFO range?

Jeez, it took you a long time to get out of the 30's! I discovered the
bandswitch, pi-network and parallel tubes in an amp around 1959. A lot safer
than the PP 250TH's I had been using on CW/AM.

The 2 x 250TH's I use on AM these days are in parallel, etc.

Carl
KM1H

----- Original Message ----- 
From: "Jim" <jbrannig at verizon.net>
To: "D C *Mac* Macdonald" <k2gkk at hotmail.com>; <james.liles at comcast.net>;
<boatanchors at mailman.qth.net>
Sent: Tuesday, March 22, 2011 12:23 PM
Subject: Re: [Boatanchors] W2EWL VFO range?

>
> 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
>>>
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