Ilkka, I use an HP 778D 20dB directional coupler for this application. 1kW applied yields 10W at the -20dB decoupled port, then I just use an ordinary 20W attenuator (Bird, Narda, HP, whatever -- lot
Hi Ilka, I've used this specific model (778D) for several years at 1 kW PEP SSB or CW without any ill effects. There's nothing active in it, and the internal pass-through conductor is large; I cannot
[Steve Katz] Isn't the reverse line termination power diminished by the return loss? That is, if VSWR = 2.0, then reverse line power would be 10W reduced by 10dB, or 1W? -WB2WIK/6 [Steve Katz] You m
A standard Eimac SK-1900 socket fits the 8122. They are readily available from Eimac distributors such as Richardson Electronics, and from some resellers including http://www.tubes4u.com -WB2WIK/6 "E
amplifier called a Mark-IV. Did the same thing for both, e.g., relocated the tube sockets down below the chassis using aluminum standoffs, and added ~+5V cathode bias using a 50W (or maybe it was 10
There's been a great deal of speculation and advice on here regarding this, but in reality, a simple answer to the simple question has been provided. There are absolutely 12V, 120A "off the shelf" po
they run about a dollar per Watt. I would say they are _very_ RF quiet, since their primary applications are powering large telecommunications systems which need to meet not only FCC Part 15 Class (
It's been 20+ years since I mucked with a Mark 1 but as I recall it had the power supply and RF components all on the same chassis. They improved that a lot when they went to the Mark II, which had a
You can go grab this one yourself at: http://www.svetlana.com/graphics/products/pdf/5CX1500A.pdf/ 73 de WB2WIK/6 "Each success only buys an admission ticket to a more difficult problem." -- Henry Kis
Yep...try this one: http://www.svetlana.com/docs/products/metal/5CX1500A.html For some reason, the .pdf URL would not link, although when you get to the 5CX1500A data sheet (above), then click on the
All the comments relating to RG174's power handling ability seem silly to me. The real weakness in the application is that the cable is so fragile that merely soldering to its center conductor can ov