[Boatanchors] 6AG7 160 meter rag chew ideas needed

[Bry Carling]

You may want to add two reuierments - no drift or FM-ing!
You will find it a lot easier with crystal control.

If you want the simplest method I would put a CARBON microphone element in the cathode 
to modulate this oscillator. There are plenty of designs for a rig like this already on the web. 
I would choose the one with a PI Network output.

For stability and to all arrive on the same frequency, you will do far better with a crystal than 
with a tuned LC oscillator. I have crystals available for the popular AM frequencies at 1885 
and 1985 kHz etc. If your club wants to make a group buy I will give them a reduced price. 
Contact me off the list.

Now here are some designs you can use. The ones that don't show AM voice usage, you can 
simply add a carbon button element from an old phone into the cathode circuit and you will be 
surprised how well it works. If you want to build a "proper modulator" that is going to take at 
least one more tube. Or at least a transformer to introduce audio from an external amplified  
audio source into the plate supply line.

At the bottom of thios page is a nice 5763 design that will work with your 6AG7 tubes.
Carbon mic goes into the jack marked "KEY."
http://dpnwritings.nfshost.com/ej/w9ves/


VE3BDB has some excellent writings on the topic, with a useful schematic here:
http://www.qsl.net/ve3bdb/onetube.html

I hope that helps.

Also if anyone is in FLorida we are doing an AM net this morning on 7290 kHz at 10 a.m.

73 - Brian "Bry" Carling, AF4K


On 16 Nov 2013 at 8:16, Wa4uso at aol.com wrote:

From:           	Wa4uso at aol.com

> I need ideas on how to put together a club  winter time building
> project 
> using one 6AG7 as a power oscillator. The  requirements are:
> 
> A - Keep it simple (low power, 1 - 2 watt  max.)
> 
> B - To function in the AM phone section of 160
> 
> C - Would  like to screen or suppressor modulate 
> 
> D - Does not have to be xtal  control
> 
> E - Need to couple to a random wire antenna
> 
> F - power  supplies and modulators are not a problem
> 
> G - parts are not a  problem
> 
> Please forward any ideas, circuits or links
> tnx 73 de wa4uso  Darrell  
> 
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