To a degree you are looking at apples and oranges. The AL 572 uses 4 tubes, the RF parts replacement cost is $144 to $239 -depending on the quality - not $60. The Al 80 Tube cost is $139 to $159 Whil
It was mentioned earlier in the thread that the 7th pin was to prevent 807s from being plugged in by mistake. _______________________________________________ Amps mailing list Amps@contesting.com htt
I would put a diode rated for the current in series with each supply on one side and paralleled on the other. Just be sure the supplies are all set for the same voltage. _____________________________
Yes for many years 833s were solid performers in a number of 1KW (output) Am Broadcast transmitter designs. That means at least 4 KW PEP output power or about 5KW pep input. Typical setup two in the
I think more likely they have those wattmeter couplers to fulfill DHS and Pentagon contracts. Look at some of the tactical base stations and there amps for them. _____________________________________
I would respond that the rules have changed and this should not be a concern. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman
probably because they have not updated the design. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
If the device is operated as a class T amplifier, the lower practical frequency limit would be around 40 kilohertz or less. _______________________________________________ Amps mailing list Amps@cont
I agree with Joe Look at the broadcast industry where the TX is usually 24/7 CCS operation. Solid state has replaced tubes on MW up to 2 megawatts in power. ON VHF FM transmitters go to 40 Kw with so
Well, not as flawed as one might think. SS is now less expensive than the almost impossible to find tube TXs. I don't think anyone makes a tube BC TX below 10 KW and you have to go to Eastern Europe
BC band. I do not know the exact power per device but since the newer devices run around a KW, I would say a 100 in a 100KW TX. _______________________________________________ Amps mailing list Amps@
I use an automatic tuner that memorizes frequencies and I can run a THP 2.5K on any frequency without doing anything. The tuner even switches antennas for me. ________________________________________
That is why a good automatic antenna tuner should be used. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
A separate RCV antenna solves that issue which is really not germain to SS vs VT anyway. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
With my Palstar it memorizes frequencies via a freq counter and automatically tunes to the correct settings. I 'calibrated' it by doing lower, mid and high for each band. That works out fine. _______
Look at Palstar. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Depending on modes used, amps today need to do more than older amps. Back when the power limit was 1 KW input amps had to produce nearly half the power that modern amps do. 1500 W out with RTTY, Cw o
Paul It was on this board a while back that someone commented that any amplifier built to be on a desk top was not going to be gutsy enough to do constant power modes indefinitely (or words to that e
It is all about size and weight. A modern SS amp could dispense with the power transformer, though, a reduce both those limitations. _______________________________________________ Amps mailing list
Mine runs just fine. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps