All, This is a simple balun question. I wish to make a 100 watt 50 Ohm to about 25 Ohm balun for 2 to 50 MHz, I realize that spread may be too large and both ends may not perform well. The input is c
All, I have a 40 year old rig with intermittants. What is a good way to clean contacts, pots, and connectors? I presume this is what are the most effective solutions? Thanks - Dan ___________________
I have to say I am very confused reading Amidon ferrite core specs. http://www.amidoncorp.com/aai_ferritecores.htm As an example in the paragraph description material 61 and 67 cores are good for tra
Should mix 67 support a 1.8 to 55 MHz 1200 watt transformer? On this topic: 1. What physical form should be used? 2. What is a reasonable turns on the 50 Ohm side (to start design). Dan _____________
All, This question is regards to a 3 to 30 MHz 'driver amp' in an SB104. If I disconnect the input from the driver amp and examine it, the input is clean. However when the input is connected to the d
This is a follow up after an additional experiment. I disconnected the source RF circuit (C board) from the driver amp and replaced it with a 50 Ohm signal generator. The driver amp output was clean
Does anyone have any idea on how to do this on a Tek 7904? These models do not bring the deflector circuits out. _______________________________________________ Amps mailing list Amps@contesting.com
All, I have an older transistor based transceiver. I have separated the circuit and substituted an external signal generator in place of the internal circuit. The circuit drives a mixer, by varying t
Thanks Will, One quick follow up: Can the RF gain of a stage be inductor collector and capacitor emmiter biased transistor be changed by varying the capacitor value? Thanks - Dan ____________________
The topic area is the SB104(A) HF oscillator and amplifier 'D' board. The first question is can the output of the oscillators be varied by changing the emitter RF bypass cap value? I believe it can.
All, I am taking an interest in the filters used in the SB-104 and A. There a several sets of these filters used in many places in the 104(A) design. There are also two different styles, one is a CL
All, I am on a quest to 'analyze' the original 104 G board. This was replaced by the 104a that was completely redesigned. This board has a bad rep as being a poor performer, I would like to figure ou
All, I have been repairing an 8405a and have noticed something about the probe sampling diodes. The HP sampling diodes have a peculiar curve that other diodes do not seem to have. They have a very sh
All, I am building an EB-104 kit. My question is: What is the best way to attach a copper heat spreader to an aluminum heat sink? My plan is to lap the surfaces on a precision granite machinist block
Interesting discussion. I bought a machinist setup granite a few years back. It will work well for this. It is not particularly large, about 12X18 inches and 4 inches thick. Sand paper and elbow grea
All, I would like to use a Tek 575 to test several MRF-150 devices. The issue seem to be the gate bias and gate step are coupled. That is the bias range increases with the bias step value. The result
All, I acquired a 577 D2 that was partially disassembled. The large vertical board on the right side of the instrument was removed. There are about 10 connections to that board (or perhaps elsewhere)
Good morning all, This is a follow up question for the main board wiring on a Tek 577 D2. Pin 510 is near the center of the main board. It has a two wires, one yellow and one green. Which wire is tow
I have one. These are very nice meters. Dan - kb0qil _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
The topic is a Murch Transmatch 2000. It is in 'better' condition with no signs of internal arcing, etc. The background: I am tuning a long wire, about 100 feet long. I tune with either a 0 dbm gener