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From TV sweep tubes? Not likely. . This is roughly what I've measured on the air.

060920@...> wrote: Drake I <http://www.w8ji.com/transmitter_splatter.htm>. It #### Tony.... W8JI has mentioned his findings on the Collins AND the drakes several times now on.... 'amps'. It's buried

wrote: to gnd without benefit of a HV fuse. like ur plywood box.... you shoulda been using 1 kv-6A diodes [400A surge] like a 6A10.... the 0nly diode worth buying these days. current from the 240 V

My shack is not much larger than yours, Jim. My Harris RF-110A is sitting in the bathroom. There is a large cooling fan in the ceiling to pull the hot air into the attic. The Harris is no-tune, 1.8-30

wrote: that The mustard. bolted right to the chassis IS 99.99% of the stabilty secret. have zero L. ### WIDE straps do have zero L. I measure ZERO L o

insulator,,, I will. The original Plywood Box amplifier used 150a-pk, 2.5A avg diodes in a FWB > and the diodes survived at least 4 flashovers to gnd without benefit of a HV fuse. ### All as you are

wrote: than ### I learn something new every day ! I never tried remoting a blower. I had been told that a lot of the noise was from the actual airflow through the tube itself, so never tried it. ###

Alternative topologies, and using higher voltage devices make things much easier. Common-emitter can be troublesome. We ended up going common-drain (simple source followers), running 28V, and using a

wrote: see moon it opens does not adequate

Jim... pentalab wrote: There is NO mention of Drake or T4XC on that entire web page that I posted the quote from <http://www.w8ji.com/transmitter_splatter.htm>. It just ain't there. 73, Tony W4ZT

wrote: ### W8JI, ALSO claimed in the same sentence, -52db for a Drake T4XC ! I owned 4 of em yrs ago... and I got the same results as the ARRL lab did... a paltry -30 db pep... or just -26db compared

I suspect you would be better off with a 300 watt amplifier running closer to class A with transformer feed back, Most RF transistors have internal emitter resistors to balance the parallel cells.

Hey, I tried to put the NFB into a solid state amp once, being used as a driver for commercial HF SSB. It was not so easy. Assuming a pair of NPN transistors delivering 100 watts at 30MHz, running

tnx, Tony. Since adding RF-NFB to a transistor amplifier is as simple as adding unbypassed R to the emitter leads, it puzzles me why Ham transceiver manufacturers don't wake up and start building

R L Measures wrote: <snip> Tom says the following: "IM3 levels of -30 dB are really very poor. An old KWM2 I tested was -47 dB using ARRL standards. Compared to something like an IC-756, the Collins

Well right now I dont have any "official test lab" figures, however W8JI has measured (if you trust him, I do in this case) -47 dB. Myself I have measured a KWM-2 compared to a FT-1000D, KWM-2 was

What is the total IMD of a KWM-2 ? R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Jim, I use the 10 kW version from Array Solutions. Checked it with the scope on the R&S dummyload @ 6 kW on 80, 40 and 20. Seems to be right on the money. Cheers, Dick