|[AMRadio] Golden Gate|
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,
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