HRO $2395.95 GigaParts: $2399.00 R and L $2399.95 All three show "on order" 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte
Please, I've seen this too many times. It is Harbach Electronics (formerly Harbach Engineering). 73, ... Joe, W4TV _______________________________________________ Amps mailing list Amps@contesting.c
The problem with Alpha and some of the others is that the diodes are not operated with FORWARD bias when in the "on" state. This creates momentary crossover distortion on each RF cycle. In order for
The 400 Volts is used to baas off (reverse bias) the receive path (antenna to transceiver) during transmit. In a 50 Ohm system at 1500W the RF voltage is approximately 275 Volts (RMS) or about 385V
The ALS-1300 is effectively two ALS-600 amplifier boards in parallel with splitter/combiner on the input/output. There are some minor changes in bias and control but they should not effect operation
I don't know that you can say that commercial amps are always designed for higher filament voltages. They are designed to handle a certain minimum line voltage but many areas regularly exceed that a
There is a HUGE difference between the design of the AL-82 and the SB-220, TL-922, L-4B, etc. The AL-82 was designed in a regulatory environment with 1500 W PEP output (about 2300 W DC input) while
The rated plate dissipation for the 8875 (transverse cooled) was 300 Watts - the cooler is not as efficient as the 8874. From the Eimac Data Sheet: The three types differ only in the method of cooli
Carl, There is a big difference between pushing snake oil and being abusive to those who point out that the device is snake oil. When top notch engineers and designers were being harassed and driven
Yes, but it is not a good design for solid state rigs. The bank of resistors only tempers the impedance swings they don't provide the energy storage flywheel of the tuned circuit. Without the flywhe
Greg, Go to the library and get the 1980 (+/-) ARRL Handbook. It has a 160/80/40 meter amplifier project based on a single grid driven 8833. That should give you a good start on your project. I suspe
I would be somewhat concerned about the quality of an amplifier using the 833. Both the Matchlett and RCA data sheets show power outputs in the 200 - 250 W range per tube in "Class B telephony" serv
L7 wattmeter is average reading as can be determined by looking at the schematic in the manual. If I recall correctly, it is identical to the Drake WH-7 (and W4) wattmeters. The sensing point is loca
This is not a "500W" amplifier. This claims to be a 2KW PEP amplifier - in AM PEP is 4 x carrier. In this case an amplifier spec'd for "500W AM" would be 4 x 500 = 2000. 73, ... Joe Subich, W4TV ___
The microHAM Band Decoder has been discontinued for two years. It was replaced by the Station Master which does (after configuration) follow nearly any computer controllable transceiver without the n
If that is an accurate external meter, 700+ W is significantly in excess of the rated output. Ameritron rates the AL-811 for 600W. There are significant changes in the input matching circuits. Compa
Bill, WSJT is a linear mode (multiple tone frequency shift keying) - it does not tolerate clipping/compression well. Since the 3-500 is specified for for 400 mA MAXIMUM you are running it well into c
WSJT may be one tone at a time but that still does not eliminate the need for reasonable linearity unless one wants to generate "clicks" every time the tone shifts. With class C any attack/decay is
The average ham has even less ability to accurately measure the 1 dB compression point on an amplifier than he has of accurately measuring IMD. Most don't have one accurate wattmeters much less two