--Original Message-- From: jeff millar <wa1hco@adelphia.net> To: Steve Thompson <g8gsq@qsl.net>; amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 17 May 2002 02:48 Subject: R
Sorry for the delayed reply. Haven't seen it much since I moved away from Milcomms. VHF handheld and pouch radios used to drive us nuts - the output stage was driven hard to maximise efficiency, then
Don't be too hard on me Jeff - I was only passing on my best recollection of an article I read that offered an explanation for things I'd seen in practice. Also, I think I wrote ...**maybe** even noi
Here's a message received from a guy I knew at university aeons ago. He reads the archives but is not a subscriber. I'm not sending it because it carries any personal baggage for me but because it's
You've lived a sheltered life :-) But seriously, I can't remember seeing it in either amateur or broadcast gear where the operating conditions for the transmitter are fairly benign. I've seen it regu
--Original Message-- From: Tom Rauch <w8ji@contesting.com> To: amps@contesting.com <amps@contesting.com>; Steve Thompson <g8gsq@qsl.net> To: <amps@contesting.com> Date: 23 May 2002 07:07 Subject: Re:
Don't know where you buy them over there, but Philips (now BC compts) have VR25 and VR37 5% ranges rated at .25W/1600VDC and .5W/3500VDC respectively. Catalogue values here are 1.2-10M for VR25 and 1
If 1kW 'forward' results in 10W coming out of the 'forward' line, doesn't 10W also end up in the terminating resistor on the 'reverse' line? The coupling spec. is 20dB nominal from 100MHz upwards - I
The forward and reverse lines don't know which way round they are, they both pick up forward and reverse power from the through line. The reverse output delivers the coupled reverse power in isolatio
snip I find it helps to consider this as two separate issues: What the readings tell you - two things, the degree of mismatch at the output of the meter (relative to the meter Zo) and the amount of p
1% power, but 10% voltage or current. Agreed - and I thought your measurements demonstrated the reality very well. To give an example of what I was meaning to convey, consider measuring a VSWR which
The directional coupler is the section of transmission line, and reflections occur at its output end. It doesn't matter whether or not there's any more transmission line downstream - there's just an
Suhner rates 174 good for 250W cw at 30MHz, 20 deg. C. That presumably gets it up to rated max. temp. of 70 deg. C so you can work out the temp. rise for your conditions. Steve
Doesn't the 'usual' construction use a coax throught the current transformer, with one end of the outer disconnected so you get the continuity of transmission line impedance while also getting the cu