The AADE instrument is more than adequate for all practical purposes. It's nice to have variable frequency option, but in any case, at the higher frequencies, the influence of unpredictable strays in
Well, well! I didn't fall far from Jack's report. It's a god toy, fit for a technician's or ham's bench! Nobody is going to sell you a space quality instrument for that amount and one item not mentio
1)Yeah, if you call 9.99 to 10.09 anything ! And then you DON'T even guess how much stray inductance you added when you soldered it in with unknown length pigtails!! 2) Rauch is right! That , when yo
He's not such an idiot as it may seem! Eons ago, I had an amplifier built from 16 sweep tubes (6KD60 in parallel; it had an output impedance of about 600 ohms. That was quite easily matched to 50 ohm
Most probably you have an oscillation problem! If what is said is true, you have a power gain of 24dB. Way too much for a single stage! Given that the amplification factor of the FET's is very much d
That's true. Electrolytics are based on organic chemicals in the "sauce" and these degrade with time, albeit it takes quite a time to happen. At a time in the mists of the past a number of us were ma
Not quite right: Intermodulation products are extraneous signals generated by mixing two or more signals among themselves: they appear at very definite frequencies in the spectrum and are perfectly c
This definition dates from AM times with "plate" modulation. The modulation system allowed the supply voltage to vary from 0 for 0% instantaneous modulation o twice the supply voltage (four time inst
You get about 18 dB power gain out of it which is quite right for a FET amplifier of this kind. The problem lies most likely with the transformer itself: the 43 material in the core is optimized for
Guys, the problem is more pernicious than that! The problem is in the way the transformers are WOUND! Efficient high power transformers are wound using transmission line coupling, not flux link coupl
First of all the guy INSULATED the FET's from the heatsink! You can see the mica insulators of the side plate where the transistors are mounted. He also used a WIDE copper strip to connect the drains
Hi guys: Read this especially the passage about #43 material: Following is a list of large size Ferrite Beads (FB), Ferrite Toroidal Cores (FT), and Split Ferrite Cores (2X), all of which are extensi
I don't think it's envy. if a manufacturer puts on the market- especially a consumer product the relevant documentation should be made available to the owners: Panasonic, Canon and others make theirs
yeees, that true in a way. but how you cope with something like the fact that Heath is DEAD? Who is the beneficiary of the intellectual knowledge of a defunct company? Usually, a company is required
If the guy is so accident prone he shouldn't use a screwdriver. Seriously guys: are you radio amateurs or what? Using that reasoning, you should not use a power plug on a cord!! Alex 4Z5KS Horsefeath
Thank you for it Carl, it's a beautiful site. I made a resolution to help the guy: I am going to send him every file I have so that it won't get lost. Please, guys, do the same! It's appalling how mu
...Point is, the 1dB compression point can be 5-10 dB below our usual operating conditions. it has more to do with low level amplifiers than with high power ones. low level amplifiers have to cope wi
None of these apply! All these resistors are meant to do is lower the Q of the suppressor inductance and dissipate the harmonic energy involved. Their stability is of no concern, since the circuit is
A number of factors conspire. First, the materials are a big stumbling block. The porosity of the materials is the main issue: the bigger the tube, the more stringent the requirement becomes and the
Even so, the GRC 106 linear amplifier had a linear regulator to feed 2 4CX250, 26 VDC filaments, in parallel with no problems. There are types of linear regulators that don't latch up at start condit