So it's still about 320mA and 1.5 volts across the bypass cap. If Q =150, 3 watts in the choke, Q=75, 6 watts in the choke, etc. Actually, depending on the bypass cap and the length of leads, it coul
The automatic test gear we had at work testing RF ICs would wear out signal generator attenuators in 6 to 9 months. Turned out cheaper to use external electronically controlled attenuators from HP an
Presence of a glitch resistor is a 'given', Carl. I have one in the power supply: it has to be effective since it's nichrome and we all know that nichrome is the magic answer to all evils! An 80 ohm,
Carl, Do they suppress voodoo? 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Two tone testing is indicative, and with the same tone frequencies and power levels, can be a way of comparing transmitters. But as you say, varying the parameters can give wildly variant (and not al
Antenna relay from a Command (ARC5) tx. can be wired for 12 or 24 vdc operation. 73 Peter G3RZP == Message Received: Nov 10 2013, 06:05 PM From: "Carl" <km1h@jeremy.mv.com> To: "Jim Thomson" <jim.tho
N, BNC and TNC always look a bit minimal for power at UHF, but there are ratings for them. A rarer alternative with bigger centre pins is the Type C. However, measurements I have done on multiple ser
Bill, Is it not the case that "Age, experience, cynicism, and an evil outlook on the opposition will generally outperform youth, innocence, ignorance and optimism"? 73 Peter G3RZP ___________________
For a long run down a tower, you need to tape the cable to the tower at about 3 foot intervals to stop things moving. For a crank up, fold over tower, my recommendation is a 5/16 inch diameter 'messe
I don't know if the ones in the Dayton flea market at something around $11 for ten are Amphenol. They are silver plate with Teflon insulation, though, and are good. Otherwise, Amphenol. Especially fo
Passive IMD had been a problem for many years (at least 60!) at multi transmitter/receiver sites - popularly called "rusty bolt effect" when applied to repeaters. It's even worse on ships, especially
To measure radiated power to 95% certainty, ETSI standards allow a +/-6dB tolerance, although most Test Houses can get to within 3dB. I built a reference dipole and bazooka balun for 400 MHz for test
Markku, It may be shown that (i.e. as the books say, it is left as an exercise for the reader!) if you have H<2 as a result of solving the equation H=gwCpgRpRg where g is the mutual conductance, w =
For 10kW PEP out, 600 volts peak to peak on the grid in AB1. At 30 MHz, that's 4.7 Amps of RF into the input capacity! 73 Peter G3RZP == Message Received: Nov 15 2013, 02:44 PM From: donroden@hiwaay.
Actually Bill, the formula was derived using tuned circuits, where Rp = QXLp and Rg = QXLg. As you move off resonance, the impedance and gain naturally drops. However, it is worth keeping the value o
adventure, I called it "The Amplifier From Hell".< With some gear, one is left with unshakeable opinion that at least the mechanical design was done by someone secure in the knowledge that HE would
Gerald, Feedback does change the input impedance, both in terms of real and imaginary components. The equations are certainly in earlier Editions of Terman's 'Radio Engineering', if not the later edi
Isn't it a question of exactly how the circuit Q is defined? Depending on your definition, it can well vary. For example, Q can be frequency/3dB offset frequency or it could be where the phase angle
If the choke is going to get hot, I'd be wary of Q dope, as it may well start melting. I've had decent results with minimal loss of Q with some of the 5 minute epoxy cements. 73 Peter G3RZP == Messag
It could be epoxy and if so, prolonged insertion in boiling water may work. No guarantee. Do NOT use the XYL's best saucepans - trouble is definitely guaranteed if you do! Even if it does work, the s