[AMRadio] Golden Gate


Geoff/W5OMR ars.w5omr at gmail.com
Tue Feb 5 11:47:02 EST 2008


JT Croteau wrote:
> On Feb 5, 2008 11:06 AM, Jose HF Silva <zehelmer at yahoo.com> wrote:
>   
>> Is that circuit just the (screen) Modulator?
>>     
>
> Don't believe so.  The talk I've seen about it indicates it's a full
> transmitter originally for mobiles out in the SF Bay Area (hence the
> name). It seemed to be quite popular in the area.  It used 1/2 of a
> 12AT7 for a crystal oscillator driving a 6146 and screen modulated by
> the other half of the 12AT7.

I found a thread about the Golden Gate (or something similar) via 
Google...  the thing culminated with this posting:

> On Dec 9 2007, 7:15 am, "W7CXA"  wrote:
> > I am looking for information on a 3 tube 75 meter am transmitter 
> that was around about 1958.  Two of the tubes were 6146, one for 
> modulator and one
> > for final.  I cant remember what the oscillator was.
> > J. Andy Thompson
> > W7CXA
> > Yakima, WA
>
>
> Back in the 50's there was a very popular TWO tube mobile transmitter 
> used by several mobile operators on 3995...  Developed by Bob Carter,
> W6NTU who lived up on the side of Mt. Hamilton near San Jose... It 
> used a12AT7 driving a sweep tube... Several of the fellows in addition
> to a variant of sweep tubes, used a 6146 and an occasional 2E26 in the 
> final as well depending on available plate voltage...  Half of the
> 12AT7 was the Oscillator, the other half was modulator...  Carter 
> Modulation transmitters were very popular due to their simplicity and
> performance.  When loaded a bit on the heavy side, the audio sounded 
> quite good... 
>
> Go to:http://www.geocities.com/ResearchTriangle/Lab/4513/carter.html
> For a bit of History and a schematic of the transmitter... 
>
> Remember load that lil sucker fairly heavy with very little 
> perceptible plate dip for best audio results...
> Good Luck  de Grady K6IXA


-- 
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)

--
73 = Best Regards,
-Geoff/W5OMR



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