Another "voice in the wilderness" comes here. I would rather say that 75 - 80 dB of receiver adjacent channel suppression, IM or phase noise limited, can handle more than 95% of today's SSB signals.
I am trying to find out what you are trying to do. "I redid the neutralizing circuit and instead of a hard wired feed off the anode through a blocking cap to the neutralizing cap, I setup a single ad
If you are using the SK-640 sockets, which lack integral screen bypass capacitors, what kind of other screen bypass do you use? Be advised that attempting linear operation of the 4X150 on 50 MHz usin
"Grounded screen" will work as it did in the Collins 204F-1 and the 208U-3/10 amplifiers,which were neutralized despite using liberal grid swamping. The electron transit time input losses at 50 MHz f
Series-resonant screen bypassing works, and was not unusual in the days of the 4-125A or 4-250A 50 and 144 MHz amplifiers. It can however be difficult to adjust especially if there are 4 tubes. 73/ K
The 30S-1 is grounded-grid, not only grounded-screen, and also is cathode-driven. It uses RF negative feedback which is a very different animal compared to neutralization. The preivously referenced C
In my opinion, the spurs are not generated in the amplifier, and not from any external signals that are picked up from the antenna, and they are not reradiated. Instead, the mechanism is the same tha
The TB5/2500 is a medium mu industrial heating power triode which works best as a Class C amplifier or oscillator. To use it as an AB2 GG amplifier would probably require impractical drive levels. A
The confusion of "Morse" and "CW" is quite typical for amateur radio, where homemade definitions abound. From the beginning, "CW" was a technical feature of the transmitter to discern it from a trans
As an ardent researcher of the world-wide regulatory history of amateur radio, I have to present a slightly dissenting opinion. The language K8RI is referring to is most probably the preamble to the
This was written almost 50 years ago, and gives some food for thought even today: "Homebrew Kilowatt Dear 73, Did you ever write an article that you later wished you had not written? I have written s
First, I share your views that this question should be addressed from the efficiency aspect. Heat that is not generated does not need to be cooled away. But, if this is not possible,my vote is for us
Oxide cathode tubes like the 8877 are not considered rebuildable, only thoriated tungsten filament cathode types are. Some 25 years ago, Econco ran a quality tube rebuilding service, that rebuilt my
Well, I am with Manfred, and I believe the professional transmitter world also is.' Looking at what is offered to the commercial and military markets, they all use the distributed amplifier and hybri
Quite interesting discussions. I would say that the major areas of improvement would be: 1) Better IMD, which could best be accomplished by adaptive predistorsion. I just took a look at the new gener
The FCC could perhaps take note of the Swedish example of "no-test" HF and VHF access. Currently, anyone that pays the equivalent of $30 and signs a statement that they will use the transmitter for "
I find the work of K1JJ quite interesting. Adjacent channel suppression in the order of 75 dB for voice signals is very good, and represents probably the best what reasonably may be realised In this
Just my 0.02: A lot of commercial and military users and systems also have stringent linearity requirements. One is the output stages of modern mobile telephony base stations and repeaters for indoor
The rise of the man-made noise floor is a real problem, but I do not hold my breath for the Authorities to increase the legal power limit for these reasons. On the contrary, I foresee quite severe po
There is a relationship between SWR bandwidth, and Q which is valid for "simple" circuits and for limited excursions from the center frequency. It uses the limit of |X| = R of the input impedance, an