Tempo one transceiver manual

Please tick the box below to get download link:. For this no need registration. Please take a look at the below related repair forum topics. May be help you to repair. If you are not familiar with electronics, do not attempt to repair! The transmitter uses many common receiver circuits; therefore it is necessary to first correctly align the receiver section. A ohms dummy load must be used on the transceiver during transmitter alignment. Take care to avoid touching high voltage points! For most sensitive indication, connect RF probe to dummy load, or use another receiver and observe its S-meter reading.

Then switch to opposite sideband position, and readjust VR Repeat several times for best result. If there is a marked difference between the two positions, then adjustment of carrier oscillator or crystal filter may be required. The filter is aligned once in receiver alignment, but further alignment in this section transmitting is necessary. Keep drive reduced to a fairly low level for the most accurate determination of the maximum peak.

In order to examine filter characteristics, set function to SSB and connect an A. If output level changes no more than 3 dB, then it is OK. Repeat on reverse sideband. If the two curves do not match, then a slight adjustment of each carrier crystal frequency is necessary to bring the two curves together In their frequency limits. If carrier is too close to kHz filter centre frequency, then high audio frequencies will be attenuated.

If carrier is too far removed, then low frequencies will be attenuated. Carrier frequency adjustment is by TC and TC Set up transmitter on TUNE, but keep level down to safe limit by adjustment of MIC gain control; then adjust driver coils and trimmer condensers for peak in output, as in receiver section alignment.

When replacing the final amplifier valves, it may be necessary to reset the bias to give correct idle current and check neutralization. Using the procedure outlined below will guarantee maximum output and long tube life.

Connect a dummy load to antenna, and set meter to IC. Locate TC3, the neutralization variable capacitor shaft in the final amplifier compartment. Tune up the transceiver at If the dip is not prominent, reduce loading control slightly for better indication. As the PLATE control is rotated the meter should rise equally and smoothly on either side of maximum dip indication. Determine which side of the dip rises abruptly. Using an insulated trimming tool, rotate the neutralization capacitor shaft very slightly in the direction which reduces the current shown on the meter.

Repeat steps 6 and 7 until the meter indicates a smooth and equal rise on either side of the maximum dip point. The final compartment cover must be in place to supply the RF shielding required during the neutralization procedure. The transceiver is controlled by a three position lever switch which is marked "oper", "rec" and "cal".

In the "rec" position the transmitter is disabled. Receiver operation is a simple as selecting your band and mode, and peaking the "Grid" control for maximum. Moving the switch to "oper" will put the transceiver into the transmit condition. If the mode switch in "tune", the carrier output can be controlled with the mic gain control, apply the minimum necessary to produce some output then dip the PA current in the normal way, keeping it below mA.

The PA is tuned up in the normal way with the mode switch in the "tune" position, but care should be taken that it is coupled into as near as 50W as possible, the loading capacitor is very closely spaced and prone to arcing. Relay close on Tx. This is a highly useable radio that can be obtained quite cheaply, is generally easy to repair, and whose performance meets modern standards if properly set up. The only real downside of it is that it lacks top band and the other "WARC" bands , the AM performance is poor - the filter is too narrow for receive, and the transmit quality is poor, being in reality SSB with reinserted carrier, and it takes some juggling with the mic gain and carrier level to get acceptable results.

Performance on SSB and CW is excellent, drift is minimal after about 10 minutes warm-up, and the controls are few and mostly intuitive to use. On - air reports on SSB are always good and the receiver has a very low background noise level, no noticeable sproggies, even on 40m, and sounds excellent.

There is not room to print the full circuit diagram in the newsletter, it spreads across four pages, but if anyone needs a copy please contact the author.

For more information about the FT, Tempo One support your club! C heck out the FT club CD. Subscribe to the Fox Tango. Powered by groups. Carol L. Maher W4CLM. Administrator Fox Tango International. I f you have an item of interest you would like to see added to the Fox Tango Web Site. All rights reserved. Circuit description. Transmitting Section Output of carrier oscillator V, 12AU7 is injected to first grid of Vl07, balanced modulator and audio signal from microphone amplifier to modulating grid of balanced modulator.

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In all, this was a simple and an inexpensive refurb. The TR7 is similar to but in most respects less sophisticated than the IC The frequency display is actually a frequency counter, and setting the operating frequency can be awkward, particularly in split mode. Internally, the radio is built of sparsely-populated circuit boards that utilize only low-level integration. Even so, the TR7 is agreeable to own and operate. The transmitter is capable of producing more than W and can tolerate a high duty cycle in digital modes.

Rear-panel connectivity is excellent and makes it possible to improve the radio without modifying it internally. Repairs appear to be relatively easy. The seller argued that the radio should be working since it was found connected at the SK's station. In fact, it was thoroughly inoperative. Most every stage of the radio was far out of alignment, and some curious mods inhibited operation further.

The rotary switches on the TR-3 and RV-3 needed cleaning. After some attention, the radio functioned, but sensitivity was poor, and output power was low. The problem was traced to the 9-MHz "soup can" IF filter and the "X" section in particular which exhibited a very narrow passband and high insertion loss.

This is evidently a common problem with the TR-3 and early TR-4 caused by aging of the filter crystals. Since replacement filters come at the expense of parts radios, bad filters in this radio are usually thought to be terminal. A solution to the problem is offered by Inrad which sells an inexpensive 9-MHz 4-pole crystal filter kit with characteristics not too different from either of the original filters in the TR-3 soup can.

The filter is unbalanced and has an impedance of Ohms. It can be made to work in the TR-3 with the aid of balun transformers at the input and output. For better performance, two of the Inrad filters could be used. Such a pair can be salvaged from the soup can filter. Switching can be accomplished by means of a reed relay, powered from the filament supply using a rectifier bridge.

The FTSD is a well-built and well-documented if unspectacular transceiver. This version has a digital display but is missing the final amplifier QRP version. One of the segments in the display was intermittent. The problem was corrected by introducing a diode in the power supply line to the display board to prevent display overheating. The only other problem with the radio was the failure of three of the LO crystals.

Replacements were available from Quartslab. The VFO in the FT drifts badly despite any amount of fiddling with the temperature compensation trimmer. CAT control became available with some additional programming. This upgrade turns the radio into a fairly good performer. It has more usable dynamic range than the other radios on this page which is further augmented by the IF notch filter.

All it needs now is a final amplifier. Isolating failures in a radio with multiple problems can be challenging, a point proven by this FTR, which was acquired at a local hamfest as a parts radio. The CPU and display board functioned from the start, but every other subsystem had at least one fault. The main board had also seen some rewiring, not all of it accurate. Much of the case hardware was missing.

On the PLL board, the Replacing the crystal and removing the glue from the area surrounding the circuit did not remedy the problem. Introducing this capacitor, which was left out by Yaesu, caused the oscillator to start reliably.

Next, one of the three shift registers used to form a serial-to-parallel converter was faulty, making it impossible to set the master programmable divider. The shift register is a common part, still widely available. Finally, Yaesu used poor quality headers in this radio, and the connection bringing in the serial data from the controller board was noisy. On the main board, the first transformer on the receiver side was open, preventing reception. Fortunately, the transformer can still be acquired from Yaesu America inexpensively.

One of the diodes used for CW keying was open, and some of the associated wiring was incorrect and had to be altered to match the schematic. This radio uses single-sided pc boards and is a nest of point-to-point wiring. Significant realignment of the receiver and transmitter sections was also required. At first, the final amplifier produced no output. At this point, however, the final amplifier became unstable, drawing full current in all modes and emitting off frequency.

The problem was found to be due to the absence of the shield which is supposed to cover the entire amplifier assembly. Fitting an improvised shield finally let the amplifier run stably, producing rated power without distortion. The all-mode radio now functions properly.

The receiver is relatively sensitive and has a MDS of dBm. It seems to be relatively free of spurs common to early synthesized radios. The radio is a creature of its times, however, replete with potentiometers, trimmers, and transformers requiring attention for proper operation.

I suspect this radio may require frequent adjustment. It would not be a good choice for mobile use. There is little to add to the trove of information available about the Ra on the internet already.

I fabricated new plug-in filter capacitors and replaced C and C before turning it on. The radio was badly misaligned, and the cams were not correctly synchronized.

Several of the slugs were binding. Having solved the aforementioned problems, I found that the 0. The calibration points for the RF filter cans for these bands kept changing. Replacing one can apiece for each band with used cans from Fair Radio Sales remedied the problem. It seems that the mica capacitors inside these cans are beginning to fail.

The radio required no further service and performs admirably. The gear train is smooth and consistent. Of the four radios, the Hammarlund was easily the most interesting to work on. This one turned up in an unusual state. The detector, noise limiter, and audio preamplifier were wired along the lines of the HQx for some reason, different tubes and all.