Very strange. Any thoughts???????? The pair of holes next to V17 is for mounting the socket for the KHz. Please see schematic below. The cathode of the 12BA6 is grounded to enable the oscillator for calibration. This was done either of two ways: 1. An extra position on the Tune-Operate switch A pull-on switch on the back of the RF gain pot. I believe that this was the method when the calibrator was added as a field modification.
The output was a "gimmick" cap So, as I understand it: 1. The unit will work transmit, receive, etc. Am I correct on both counts? Swan must not have made many c units. There is virtually no information on them on the internet lots of info on the but not the c. Last edited by artdecoradios on Feb Wed 26, am, edited 1 time in total. Re: Question involving Swan c Transceiver by radiotechnician » Feb Wed 26, am here is power supply data. Re: Question involving Swan c Transceiver by Jthorusen » Feb Thu 27, am Greetings to Artdecoradios and the Forum: To answer your question, yes, the radio will work without the xtal calibrator tube or circuit installed.
However, you do not mention whether or not the xtal socket is installed. In any event, I would have a look under the chassis and make sure that someone did not stop the modification job halfway through and leave some wiring hanging. You might have some fireworks if they did.
And it has the mentioned tube installed. It has a trimmer one the left and a coil on the right. You mentioned a calibration via pulling the rf gain pot. Mine does this. Do you have any more info on the calibration technique used? If you are asking how to calibrate the calibrator Khz oscillator, then you would need to monitor it with an accurate frequency counter or couple a signal out of it to mix with an off-air WWV signal as received in a general coverage receiver.
In the former case, the calibrator accuracy will be roughly the same as the accuracy of the frequency counter time base; in the latter case, zero-beating the calibrator with WWV will get you quite close, subject only to propagation induced errors involving the WWV signal.
If you are asking how to use the calibrator to calibrate the Swan dial readout, one energizes the calibrator circuit by pulling out the RF gain knob to close the attached switch. One then adjusts the "Dial Set" knob on the front panel of the Swan for zero beat.
For example, let us suppose that you are interested in operating near the high end of 40 meters. If you wished to operate closer to the center of the band, you would set the VFO to KHz and again adjust for zero beat there.
From one end to the other of the ham bands, the VFO is unlikely to closely track its dial markings. However, in any given KHz segment, it will be pretty close, so setting the dial to zero beat the calibrator reference signal at the closest KHz multiple to where you will be operating will ensure maximum accuracy. Be sure that you use the appropriate dial hairline for the sideband in use; LSB lower side band for 40 and 80 meters, and USB upper side band for everything else.
Of course, don't forget to turn off the calibrator push in the RF gain knob after you have made the adjustment or you will have a strong, annoying "birdie" every KHz across the band.
I hope this answers your question. Regards, Jim T. And yes it did answer my question. I had set the dial with a freq counter and was not sure as to why I would need a second calibration for it.
Specs Manuals 0 Reviews 1 Prices 2 Compare. Login or Register to upload images. General characteristics HAM bands 80m 40m 20m 15m 10m Frequency stability? Tuning steps? Receiver system? Image rejection? Audio output?
Form factor Unknown Manufactured Between and 19xx. QRZ Machines, Inc. You can transmit and receive on all 5 bands with your transceiver, and when used with the Mark I linear amplifier, you're at the legal power limit Switch in the Mode outboard VFO and you're all set for separate transmit and receive operation.
Yet this complete home station, with proven Swan performance, reliability and craftsmanship is yours for substantially less than any other comparable equipment. Setting new standards for the industry. This three- transistor converter furnishes a quick way to receive ham television signals on MHz. Here is a simple converter for the MHz ham TV band. The two rf stages arc conventional quarter-wave trough-line circuits. The mixer-cscillator also uses trough-line circuits. Tfie AF transistor U.
S, equivalent is Amperex 2X has a collector capacitance of only 1 pF and a comparatively high collector resistance so it loads the high Q circuits very little. It is advisable to use button mica or other UHF capacitors for coupling and decoupling. Disc ceramics can be used il they; are modified slightly. Heat one side of the capacitor to crack off the ceramic and unsolder one lead. Then place the bare, tinned side of the capacitor against a tinned part of the chassis while heating the chassis from the other side.
This makes a very good VHF capacitor, though you may break a few capacitors doing it. The third transistor in the converter is a self-oscillating mixer. A voltage variation of 2 volts causes a frequency drift of only kHz a TV signal is about 4. The 0,8 pF capacitor between the emitter and collector maintains oscillation.
The collector current of the oscillator-mixer is 4. The if signal obtained after the mixing process is filtered out by L6 and the 6 pF capacitor and fed by a link to he input of a TV receiver tuned to channel 2 MHz in the U. L6 is damped with a 2. The coaxial connectors were spaced off the chassis a little to prevent their interfering with the quarter wave lines. It was translated by Jos.
Schematic of the simple MHz converter for ham TV. Put your signal where it counts. Employs 4 operating elements on 10 meters, 3 operating elements on 15 meters, 3 operating elements on 20 meters.
Constructed of heavy-wall aluminum for maximum strength-Rated for full power. Silect Six Meter Converter.
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