-- ORIGINAL MESSAGE --(may be snipped) REPLY: When I was a new ham back in the late 1950's, the FCC issued a number of citations for excess power and the details were printed in QST. As I recall, som
-- ORIGINAL MESSAGE --(may be snipped) REPLY: A bit off topic, but I have always wondered why the FCC thinks it has the power to censor profanity. The Constitution guarantees free speech and the Supr
-- ORIGINAL MESSAGE --(may be snipped) REPLY: I'm sure the folks who got the citations would be interested in your comments. 73, Bill W6WRT _______________________________________________ Amps mailin
-- ORIGINAL MESSAGE --(may be snipped) REPLY: They DID get in your shack. The procedure was this: 1 Park a vehicle nearby with field strength measuring equipment. 2. Take the FS reading on a carrier.
-- ORIGINAL MESSAGE --(may be snipped) REPLY: Quoting from Part 97: 97.103 Station licensee responsibilities. (a) The station licensee is responsible for the proper operation of the station in accord
-- ORIGINAL MESSAGE --(may be snipped) REPLY: That is approximately 17 dB gain, which is more than the FCC rules allow for a commercially built amp. Perhaps the factory "corrected" the gain to make i
I'm thinking of getting an SPE 2K-FA amplifier and I have a question about duty cycle at full power. I understand it will run full 1500 watts on SSB and CW, but not so on RTTY, at least not brick on
-- ORIGINAL MESSAGE --(may be snipped) REPLY: RTTY has no error correction, so the answer unfortunately is yes. Every mode has a tradeoff. Modes with no error correction are faster but need more powe
-- ORIGINAL MESSAGE --(may be snipped) REPLY: The Expert Amps folks did indeed have a good price following Dayton, but it expired on May 26. I was tempted but ended up buying a used one I found onlin
-- ORIGINAL MESSAGE --(may be snipped) REPLY: In order to achieve a wide range of impedance matching, you need to have two of the three elements variable. Variable capacitors are preferred by most de
-- ORIGINAL MESSAGE --(may be snipped) REPLY: 300 ohms is a little high. Most designers use from 50-100 ohms. You need to fine the "sweet spot" for the value. If it is too high, the circuit becomes e
-- ORIGINAL MESSAGE --(may be snipped) REPLY: The 6A10 diode is a good choice for this function. It has a surge rating of 400 amps (!) and should handle anything your amp can throw at it, and they ar
-- ORIGINAL MESSAGE --(may be snipped) REPLY: There is a better way, IMO, to do the conversion although it's too late now for Steve. But for anyone else considering this, it can be done while still u
-- ORIGINAL MESSAGE --(may be snipped) REPLY: Sounds good to me. Where does one get such a supply and what is the cost? Generally, if you change the Ep and increase the Ip to maintain the same power,
-- ORIGINAL MESSAGE --(may be snipped) REPLY: What that means is this: With the amp completely UN-POWERED, you apply a 50 MHz signal at the input and monitor the output. Adjust the neutralizing circu
-- ORIGINAL MESSAGE --(may be snipped) REPLY: If you remove the tube, you are also removing the tube's internal capacitances. Better to leave the tube in place and just remove all voltages from it. E
-- ORIGINAL MESSAGE --(may be snipped) REPLY: A well designed amplifier should be stable without the above loads. Not all amps are but it is a good target to shoot for. 73, Bill W6WRT _______________
Roger, it would help if you could draw a schematic and post it on a website somewhere. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://list
-- ORIGINAL MESSAGE --(may be snipped) REPLY: I agree with Vic's comments 100%. The only way to neutralize with a pi-input circuit that I know of is with a coupling coil from plate tank to input tank
-- ORIGINAL MESSAGE --(may be snipped) -- ORIGINAL MESSAGE --(may be snipped) REPLY: I see a potential problem with that. Having only the single variable capacitor will case a phase shift when adjust