JT Croteau wrote:
On Feb 5, 2008 11:06 AM, Jose HF Silva <[EMAIL PROTECTED]> 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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