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Author Topic: looking CW Side-Tone monitor suggestions!  (Read 1641 times)
KC9KEP
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Posts: 208


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« on: January 25, 2007, 09:07:12 AM »

Hello all!

I was wondering if anyone had some ideas about this ..

I am in the process of setting up my homebrew (tube)
transmitter *and* receiver in the hopes of doing some QSO's.

(I've already successfully used the transmitter, but received by
using my ICOM IC-730 .. now, I want to try a regenerative receiver.)

So far, I have set up a T/R switch that:

1.) Disconnects the antenna from the receiver and routes it to the xmitter
2.) Shorts the antenna input to the receiver
3.) Mutes the receiver by disconnecting the B+ to it

The only question that I have now is how to monitor the CW that
I'm transmitting, so I guess I need a "side-tone monitor".

My current transmitter has a integrated NE-2 bulb oscillator which
kind-of works, but it doesn't represent what I'm actually transmitting,
and it sounds kid of "ratty".

And, I'd like to be able to monitor the receiver and side-tone monitor signal
without using 2-sets of headphones.

There is a circuit in the most recent issue of QST magazine that I just
may try.  It shows a basic 1-tube CW side-tone receiver gizmoe.

Has anyone (alive) had experience doing this, and what is your preferred
method?

73's!

--Tom Nickel

KC9KEP
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VA7CPC
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Posts: 2387




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« Reply #1 on: January 25, 2007, 09:48:04 AM »

This is probably too modern for you, but:

You could use a paddle (or straight key), and a keyer with built-in sidetone generator.  

There are a few solid-state keyer kits on the market (PicoKeyer is a cheap one, and it has a sidetone speaker).  

If you want a "no-transistor" setup, you might find an old tube keyer on eBay that would do the job.

   Charles
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AD5X
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Posts: 1430




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« Reply #2 on: January 25, 2007, 02:15:23 PM »

Can you just not mute the receiver?  I operate cw with a Johnson Ranger and Drake 2B. My T/R switch operated like yours, except that I don't mute the receiver when operating CW.  The Drake 2B AGC is plenty fast enough to control the audio level during transmit.

Phil - AD5X
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KC9KEP
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Posts: 208


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« Reply #3 on: January 25, 2007, 03:35:09 PM »

Thanks for the suggestions, all :-)

I'm unable to mute the receiver as it stands,
unless someone can think of a way ..

The circuit is so simple, that it only has one
tube (a 6C8G dual triode).

Here's what my receiver looks like:

http://www.bignick.net/Morgan_Radio/Radio_3.htm

And, its schematic.

http://www.bignick.net/images/RadioPix/1942_RAH/1942_Regen_Radio_Skizzie.jpg

Here's my transmitter:

http://www.bignick.net/Morgan_Radio/Radio_11.htm

And its schematic.

http://www.bignick.net/images/RadioPix/Xmitter/Xmtr_Schematic.jpg

Thanks again,

--Tom Nickel
KC9KEP
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KE5ITG
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« Reply #4 on: January 29, 2007, 09:47:46 AM »

There is a really neat article on how to build such a side-tone monitor in the latest issue of QEX (January/Febuary), "The Ultimate Sidetone: Make a Vintage Radio Even Better With a Modern, Well-Engineered Sidetone."
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KC9KEP
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« Reply #5 on: January 29, 2007, 04:05:53 PM »

Thanks again for the ideas!

I've subscribed to QEX, so I hope to try their
side tone monitoring techniques!
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