[GreenKeys] CV-89

[Linger, Michael I]

I used the CV-89 converters for several years in the military as well as it was my only converter in ham use in the '70's while in Navy MARS.  I had no troubles at all in the military with them and rarely any trouble with my own units while in MARS, which I used several times a week for RTTY net operations.  I still have several of them and really like them.  These units were designed to operate with a rather large fan unit on the back of them, mainly because they were to be used with their brothers (another CV-89 and a CM-22 comparator unit), all stacked in a rack that runs pretty hot when all turned on.  However, I used my CV-89 units without the fan and by themselves and found they ran with no issues.  I also ran my CV-89(B version) with an outboard simple 3 stage op-amp 741 input limiter at the audio input which enhanced the performance significantly.   The only tubes I ever replaced were the 6x4 rectifier tube, which runs hot regardless of where it is, and occasionally I replaced the 6AQ5 tubes in the keyer circuit.  All the tubes in this unit are available on ebay for cheap, as well as all over the internet at various sites.   Over my 52 years in amateur radio I think I've had nearly every kind of TU they've made in the past, including the ST-8000, ST-8000A, Flesher, DT-600, Heathk 3030, URA-17, CV-116, etc., and all the ST Hal units and all I've kept is my trusty CV-89B's, the ST-6, and my Dovetron MPC-1000CR.  That said, I have to say it's pretty hard to argue with the High-Tech equipment we have today for data communications.  So ask yourself what you want to have fun with and go from there.  If it's the old vintage stuff, don't be afraid to acquire and play with it to make it work for you because you'll learn allot and move on.  If the old stuff is what you like you wouldn't be on this forum asking about archaic things like Teletype!
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