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REFERENCE MATERIAL

Your First Rig
Page 2

A few caveats to watch for with the Kenwood and and particularly the Yaesu line:
Throughout the mid to late 70s illegal activity on frequencies allocated to the Citizens Radio Service was at an all time high. This was fed in part by a peak in the sunspot cycle that occurred just as CB radios became cheaper. At the same time, those interested in illegal activity discovered that with a simple modification, the Yaesu line of HF transceivers could be made to operate on 11 meters. Additionally, with a little more modification, the Kenwood line could be made to do the same thing. Consequently, a number of the Kenwood and Yaesu transceivers manufactured during that period we're converted, more often than not, by operators that had no inhibitions about turning screws and adjusting slugs just to see if they could "get out better". Consequently, prior to purchasing any of these units, a thorough check of each and ever function should be undertaken. Don't hesitate to open the radio up - both manufactures did a remarkable job lashing cable and neatly tucking everything into its place.


Kenwood TS520S


Any disarray should be looked on with suspicion. If a board was replaced at some point, try to find out when and why.

Turn the transceiver on and let it warm up (be sure to turn on the "hv" or "heater" switch, as well - this will power up the tubes. After it's been on for 30 to 45 minutes make a contact on each band, especially 10 and 15 meters, which are most likely to have suffered the effects of any modifications.

Watch the plate current, and after checking the operating manual, check the grid current to make sure it is within specified limits. Check each function of the panel meter.

Finally, disconnect the antenna and attempt to tune in a station on 20 meters. If you are unable to receive any signals on 20 in the middle of the day, have a shop test the unit's receive sensitivity.



Yaesu FT101E

Finally, if you are purchasing it from a dealer, get a warranty - even if its 30 days, it will give you the opportunity to return it for repairs if need be. And, get a manual - preferably the original manual that came with the rig. If you are buying it from a private party, get a little information on the party your dealing with - don't assume just because he or she's a ham that everything will turn out alright.



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MORE GOOD
STUFF


SELECTING A TUBE

RF INPUT CIRCUIT

RF OUTPUT (TANK) CIRCUIT

TRANSFORMER POWER CAPABILITIES

PARTS IS PARTS

ROLLING YOUR OWN - TRANSFORMERS AND CHOKES

POWER SUPPLY PROJECTS

LEGAL LIMIT AMP PROJECT