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Post by twister526 on Jul 29, 2010 16:05:34 GMT -5
Could anyone tell me if A Siltronix MOdel P 90 VFO with the number 1 on the back, can be used with a Tram D201A. If so would anyone have that info. Thanks
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Post by cbrown on Aug 2, 2010 8:23:30 GMT -5
I believe the Tram 201A used the same Siltronix VFO number as the Browning, the 90-3 (number 3). Someone correct me if I'm wrong on this.
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Post by Tombstone (R.I.P.) on Aug 2, 2010 10:43:58 GMT -5
According to my partial chart of Siltronix VFO's, cbrown is correct. My chart is for the Tram D201. Don't know if the D201A is the same. My chart states that the D201 needs the VFO's output frequency to be 16.5585 MHZ. The Browning Mark III sideband transmitter needs 16.560 MHZ to operate the oscillator. No matter, The Siltronix Sliders don't have enough output to drive a tube oscillator properly, an amplifier has to be used to avoid problems and without a slider/buffer(amplifier), you'll notice a lower wattage output from the radio. This will damage a Browning eventually but I'm not sure about the Trams, probably the same. I think there's a slug on the back of the Siltronix to trim the output frequency. A little confusing.
Tombstone
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Sandbagger
Administrator/The Boss 
Posts: 6,250 
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Post by Sandbagger on Aug 2, 2010 20:44:05 GMT -5
According to my partial chart of Siltronix VFO's, cbrown is correct. My chart is for the Tram D201. Don't know if the D201A is the same. My chart states that the D201 needs the VFO's output frequency to be 16.5585 MHZ. The Browning Mark III sideband transmitter needs 16.560 MHZ to operate the oscillator. No matter, The Siltronix Sliders don't have enough output to drive a tube oscillator properly, an amplifier has to be used to avoid problems and without a slider/buffer(amplifier), you'll notice a lower wattage output from the radio. This will damage a Browning eventually but I'm not sure about the Trams, probably the same. I think there's a slug on the back of the Siltronix to trim the output frequency. A little confusing. Tombstone The D201 and D201A use the same mixing schemes, so the same VFO will work. The crystal oscillators in the Tram are solid state so I don't think you'll run into the same "low drive" issue as on the Browning. The Tram has a built-in manual tuner/VFO that works fairly well, so I don't see too many out there with external units on them |
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Post by Tombstone (R.I.P.) on Aug 2, 2010 21:46:17 GMT -5
Oops, I thought that the Trams had tube oscillators.
Tombstone
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Sandbagger
Administrator/The Boss
Posts: 6,250
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Post by Sandbagger on Aug 3, 2010 6:24:26 GMT -5
Oops, I thought that the Trams had tube oscillators. Tombstone I guess I should clarify. The crystal oscillators are solid state. The internal VFO is a tube oscillator. |
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