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Messages - W7TFO

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Technical Central / Re: interstage transformers
« on: September 04, 2013, 12:05:21 PM »
Indeed, you are always welcome here, questions or not 8)

What you have asked is beyond the scope of most of us here, hence no replies :-X.

First off, one needs to clarify at what frequency your transformer is operating at; AF or RF.

There are some very highly versed technical minds on another forum,

I'd take my question there and be ready for an onslaught of diatribe :o.

73 DG

Technical Central / Re: rf choke values
« on: August 21, 2013, 08:48:44 PM »
I'm such an old-school dinosaur I never even thought about a ferrite in the works...

With them, I'm of no use.



Technical Central / Re: rf choke values
« on: August 21, 2013, 07:27:10 AM »
The choke value is not only rated in uH, but also for a resonance point, usually relative to the distributed capacitance across it.

This is why you find some RF chokes having different-sized pies wound on it: to reduce the 'solenoid' effect of a single winding at particular frequencies.

If self-resonance occurs at a particular frequency, it will cease to perform the isolation function.  If it is handling power, such as in a plate circuit, it will probably burn and be damaged.


Antennas / Re: Torroids..can I use stranded wire instead of solid?
« on: June 30, 2013, 10:05:20 AM »
I have seen many such transformers wound with stranded for both power and RF use.

There may be a slight difference in performance, testing will get it closer to your target.


PRE-WW2, Gear / Off to a good start
« on: June 14, 2013, 10:55:46 AM »
Welcome to the newest ham forum out there!

Let's see photos and stories about radio equipment from the halcyon days before 1942.


Not be picky, but RCA wouldn't have a thing to do with Eimac in the time period.

That pub was from Eitel-McCullough directly.


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