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  1. E

    older XCVR ..hack job... add a new SDR for the IF board

    has anyone thought about adding a new SDR for use as the IF, TS930 others I have been away from the mic and key for a long time. what bothers me is that a Flex3000 cost 1 grand more that the 1500, and all more you get is a 100W PA. Elecraft K3S, the 100 watt PA is 700bucks? Yuc
  2. E

    what is a 'pulse rated' tube?

    OK. a thread about Russian tubes was getting too long. ....................... what is a pulse rated tube? My understanding is.. a pulse tube has 10X or so as much cathode current emission as a 'normal' tube. --> useable as a normal tube as long as you heed normal (CW) limits on the...
  3. E

    noise figure of mixers

    is there someone here that can help me understand the difference between the dsb and ssb noise figures, and more importantly, in a typical situation, which applies. the typical story is that NF is usually about 0.5 db worse than conversion loss. ( hard to put into writing here)...
  4. E

    FM broadcast... tubes for hams

    I have been away from the electronics industry for a long time. A quick internet-search look at commercial FM transmitters shows, power output up to 1KW or so. or I missed some. what's going on at higher powers? what happens to pulled tubes? 3-500 4-400 4-1000 (glass, remember...
  5. E

    very old Icom IC-02AT

    applied 12vdc to an old Icom ic-02at, that was disused for many years. makes static noise, and display flashes '60'. squelch does not quiet. no other response was noticed. is there some secret code, to wake it up?, or its junk?
  6. E

    440 FM rx-noise figure, what is good enough?

    for 440 Mhz FM, suppose you had 5 db of feedline loss, with a preamp, --> noise figure of 7 or 8 db.. in a real situation, is that good enough or not? what would be equivalent sensitivity? 73
  7. E

    tower mounted booster

    does anyone make a combo pre-amp and TX booster for tower mount. the cost of the booster could be offset by using cheap-small coax. extra credit if the coax is used for the DC
  8. E

    Split, with only one VFO dial

    I have been away from the mic for a long time. The last time I used split, it was on a Drake R4-B, T4 ............... with rigs from the modern era (TS-930 and newer) is it possible to go from. rx.vfo A,,,,,tx.vfoA to rx,vfoA,,,,,tx.vfoB and at the same time move the vfo.B to a...
  9. E

    Yagimax, a possible 20m design

    does anyone use the Yagimax program?, here is what I have come up with. ANY comments welcome. I just can't get it better than this at 18 ft boom length 20 meters, dims in feet rf. 34.4... 0 dv. 33.2... 5 di. 32.2 ... 18 which results in, gain of,,,, edge, 14.2 , edge,,,, of 8.52...
  10. E

    what happens to transformers in scrapped transceivers?

    If I came across 4 transformers from junked (for example) TS 520s or 820s . I could build a nice 400w amp from a Russian tube or two.
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