[Amps] Permeability tuned tuning coils, with taps?

[Glen Zook]

There is no power limit of 200-watts for General Class, Advanced Class, or Amateur Extra Class operators in the 28.0 MHz to 28.5 MHz range.  There is a 200-watt power limit for Technician Class and Novice Class on frequencies that those class of operators are allowed below 50.0 MHz.  This is covered in 47 CFR Part 97 Section 97.313(c) which reads as follows:

(c) No station may transmit with a transmitter power output exceeding 200 W PEP:

(1) On the 10.10-10.15 MHz segment;

(2) On the 3.525-3.60 MHz, 7.025-7.125 MHz, 21.025-21.20 MHz, and 28.0-28.5 MHz segment when the control operator is a Novice Class operator or a Technician Class operator; or

(3) The 7.050-7.075 MHz segment when the station is within ITU Regions 1 or 3.
 
Glen, K9STH


Website:  http://k9sth.com



On Wednesday, January 15, 2014 1:05 PM, "Fuqua, Bill L" <wlfuqu00 at uky.edu> wrote:
 
   There used to be a power limit of 200 Watts in the novice/tech+ sub-band on 10 meters regardless of
license class. Is that still in effect?

73
Bill wa4lav
________________________________________
From: Amps [amps-bounces at contesting.com] on behalf of Chris Wilson [chris at chriswilson.tv]
Sent: Wednesday, January 15, 2014 1:24 PM
To: amps at contesting.com
Subject: Re: [Amps] Permeability tuned tuning coils, with taps?

Wednesday, January 15, 2014, 10:22:05 AM, you wrote:


> I vaguely remember seeing a 4 channel, 2-10 MHz, 100 watt output
> commercial amplifier using three 'instant heat' 6146s (actually
> QZ06-20)which used permeability tuning on the PA coils. I think the
> coil had three taps to cover the frequency range: it was driven from
> a nominal 10 watt input SSB packset, and ran from a 12 volt vehicle
> supply, with a germanium transistor DC-DC inverter. The packset was
> mainly germanium transistors, too....That was 50 years ago.....

> 73

> Peter G3RZP

Maybe people wonder why I ask? I have a Henry 2000D RF generator a
friend and I are converting to a 10n meter linear. It's near as damn it
done now, a simple thing for many on here, a challenge for us
beginners, as I had to make the PSU and control stuff from scratch.

I bought two big vac caps off Ebay a while back, new old stock. One
seems fine, the other arcs on test at 50% below its rated DC volatge.
These things are *EXPENSIVE* new. Used ones are a lottery, as are old
stock, as there's no way to test the depression inside them without
doing an HV test, after you've bought the thing. So, I was
looking at how Henry used a brass slug permeability tuned tuning coil
of heavy copper tube, instead of a variable tune capacitor, and a
sheet metal flapper cap for loading. I was wondering if at a later
stage I could plagiarise the design to make a 20 meter or even a 20 / 40
meter version and make a longer coil, with taps
for other frequencies, and just have to use one vac cap for load? I am
in the race car engineering business, so have good fabrication
facilities, the hardware for a bigger brass slug tuned circuit would
be pretty straightforward. Photo of the Henry 2000D deck is at
http://www.gatesgarth.com/henry6.jpg

Thanks everyone.




--
Best regards,
Chris                            mailto:chris at chriswilson.tv

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