Looking for an HF (3-30 MHz) Coupler for rf measurements. HB or commercial will do. Accuracy is not important but flatness would be a concern. 30dB port would do. Any suggestions ? I think I found o
Looking for an HF (3-30 MHz) Coupler for rf measurements. HB or commercial will do. Accuracy is not important but flatness would be a concern. 30dB port would do. Any suggestions ? I found an articl
Seems I responded to the OP only. Oops. N4GA has an article on his site for a 50dB sampler: http://www.n4ga.com/50db-hf-rf-sampler/ This article goes takes a somewhat unusual path to get to the chee
From an amplifier heating standpoint it probably makes very little difference what power level you use with an Elecraft KPA1500. See the Elecraft post on efficiency in the link below. I am not an am
I may be able to energize the filaments for a brief period with the RF deck bottom up to get a direct reading from the socket bottoms. There won't be any blower though, during that few seconds. If
Lots of reading, LOTS of help from others here. This should be the last bit of questions I have the need of help with. When doing the like reverse plate load simulation test. I have been told, and h
The 3-500Z is an excellent tube, but 1500 W isn't reasonably available out of a pair, even at increased plate voltage. I don't know about that, there are guys (free banders) on YouTube that have no
The reason is that you need to communicate with vintage radio people. I've never owned a DX100 but my experience with classic transmitters is that manufacturers made fairly significant changes over p
I could use assistance from anyone who knows this Drake Amplifier and it's power supply. 1st I have advertized widely for an original one to buy - nothing.2ndly I did get a 'home built' power supply
Hi Rick and Jeanne Paquette: Please remove me from this list and group. _______________________________________________ Here everything is "self serve." http://lists.contesting.com/mailman/listi
I bet it's expensive! But, if you're looking for a legal limit amp, this looks impressive. Software upgradable too. https://qrznow.com/rf-kit-rf2k-s-amp-ham-radio-amplifier-legal-limit-hamvention-202
Alton McConnell via Amps wrote: (in part) I suspect that we might need to find a HW 100 or 101 (tube type finals) to use as an exciter until we get this issue tracked down. What do professiona
Alton McConnell via Amps wrote: (in part) I suspect that we might need to find a HW 100 or 101 (tube type finals) to use as an exciter until we get this issue tracked down. What do professiona
Possible stupid question alert. Why not measure filament current instead of voltage? Then you do not have to worry about accounting for losses in the filament path or the position of the voltmeter c
Another much cheaper alternative is to just use a separate bias or screen supply depending on which one has failed. However since my transformer has a 4.6k ohm short from the 105 V winding to the HV
An interesting point, Steve. If I understand you, youre saying that if a modern diode in a series string approaches reverse breakdown, it will start to conduct, thus shifting its overload voltage to
Hi steve@nr4m.com: You should think about the power supply has L1 and L2 as it's power input. If it is 120. Volts or if it is 240. Volts it doesn't matter an appropriate THREE pin plug is correct
Should HV be held off on a 8877 until the heater warm-up timer expires? -- Ron W4BIN - Understanding is much better than knowing how.MX _______________________________________________ Amps mailing l
On 3/1/23 10:51 AM, Victor Rosenthal 4X6GP wrote, in part: If one of these isn't big enough, then you need to replace both of them with a bigger one. (higher ampage contactors) So true, when we ge
Electrons are produced when the filament wire is heated above 2200 ^o C. Adding small amounts of thorium to the tungsten in the filament wire *reduces this temperature substantially*, to about 1700 ^