The BC375 which used a 211 oscillator driving a 211 PA, modulated by a pair of 211s, had a parasitic suppressor in the oscillator grid, but no suppressor in the plate, and the PA had none at all. 73
When one is talking of a home station where the situation is relatively stable, it is now not difficult to measure the antenna feed impedance, and then design/build a tuner to allow matching. For an
Jim, MAX-GAIN systems has them in stock, although you may not like the price. http://www.mgs4u.com/index.html I have dealt with them and was very pleased with the service, and I believe they have a g
It's many years since I was taught about induction motors, but I seem to remember that as the volts drops the 'slip' from synchronous speed drops more with load - if you like, the 'mechanical regulat
If you switch at zero voltage, there is no EMF to drive a current through the load impedance. A quarter cycle later, when there is EMF across the load, the current will lead or lag by a factor depend
I think that there is a very good argument in favour of Gerald's (K5GW) suggestion. If the relay went short on switch on, would you know? Not until you tried to turn it off and found that it wouldn't
My gut feeling is that there is a voltage transient at turn off causing the problem. Maybe a Transzorb or MOV would help. Personally, I prefer good old fashioned contactors, although the buzz you som
Not if those ripple current ratings are correct. 73 Peter G3RZP == Message Received: Feb 15 2014, 02:59 AM From: "Carl" <km1h@jeremy.mv.com> To: qrv@kd4e.com, amps@contesting.com Cc: Subject: Re: [A
Yahoo is your friend http://www.benduncanresearch.com/manuals.htm email: bdr@bdr-uk.com Fax: +44 (0)1526 342 869 You can get the operator manual and part service manual. Most of these machines are a
The problem I had with my ACOM 1500 was firstly, a PL259 with a somewhat small centre pin and a SO239 output socket on the amp with a slightly larger socket, plus a power spike out of my FT102 on the
Low audio noise means a big blower running slowly. There was an old professional tx with 16 4CX250B in a distributed amplifier (cabinet 7 foot high, 2 feet wide and 3 feet deep!) that had an external
That depends on what the ground is. I use a 60 foot tower topped off with a 4 ele Steppir, with the directors and reflectors strapped to the boom to give a better capacity hat, and fed as folded unip
Being a folded unipole, it has a high feed impedance - 1200 ohms or more. The current in the radials is measured by taking the ring to which they were all connected and using a 250mA thermoammeter be
Collins S-Line. Even some of the mighty expensive rigs have pretty crappy IM figures.< SM5BSZ has done some work on this, and let me use some of his data for my presentation at the RSGB Convention la
Karl-Arne I am not so sure. Admittedly, requirements for spurious emissions for the amateur services got pushed in as a result of the work of TG1/3 'tidying matters up for all services', formed after
small hours in VHF events.< Sounds like the definition we had of a broadcaster - 'It is better to send than to receive'... 73 Peter G3RZP _______________________________________________ Amps mailing
Rules I heard early on and adopted: 1. Never wear jewellery - rings, bracelets, neck chains etc when working on live equipment at any voltage. 2. Never wear rings when soldering - a drop of molten so
much faster than normal.< Some 40 odd years ago, I was in a bar (surprise!) drinking with some railway train drivers (Diesel-electrics). The conversation got around to: "Ere, you know summat abaht e
Whether it's worthwhile electrically depends on the frequency. At 144MHz, the skin depth is 0.2 mil (0.0002 inch) and you need about 5 skin depths to keep 99% of the current in the silver, or about 1
One skin depth is 2.6 divided by the square root of the frequency in MHz - that's the answer in thousandths of an inch. (ITT 'Reference data for Radio Engineers') So at 10 GHz, one skin depth is 26 m