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Author Topic: Homebrew 6m Receiver?  (Read 4949 times)
KC2VDM
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Posts: 145




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« on: April 04, 2012, 03:15:02 PM »

Has anyone built their own 6m AM receiver? I'll soon be in possession of a 6m AM transmitter from a friend of mine, and have been real anxious to build a simple receiver. Google hasn't turned up much. I'd like to build it using vacuum tubes if i could. I've got plenty of tubes that I could probably use. I've also got a handful of transformers.

If anyone has any idea's or knows of any articles, I'd like to hear them.

Thanks
-Alex
KC2VDM
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JAHAM2BE
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« Reply #1 on: April 04, 2012, 03:59:56 PM »

"An Ultra-Simple Receiver For 6 Meters" by Charles Kitchin:

http://www.arrl.org/files/file/Technology/tis/info/pdf/9712039.pdf

It's a regen design that can also superregenerate (so it can receive CW, SSB, AM, and FM). It uses JFETs. I built this receiver and the audio gain seemed somewhat low (testing with a local signal source) and I never actually heard any signals on it. That's probably more due to my poor antenna and lack of activity on the band rather than any problems with the receiver itself. It's a bit of a pain to get it oscillating (layout is critical and the common-gate Colpitts topology isn't always easy to get oscillating). The author later published an updated version with a Hartley-style tapped inductor, in "New Super-Regenerative Circuits for Amateur VHF and UHF Experimentation” (September/October 2000 QEX).
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WB6BYU
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« Reply #2 on: April 04, 2012, 04:50:49 PM »

You might check JF1OZL's web page:

http://www.intio.or.jp/jf10zl/

He has a couple circuits for 6m AM transceivers that you could borrow the
receiver circuits from.

For a tube circuit you could build a converter to use in front of a SW receiver,
or even an AM BC receiver.  (With a 50 MHz crystal you could tune 50.550 to
51.700 MHz on the main tuning dial of the latter.)

There are further links to 6m receivers (and many other circuits) on PG1N's page:
http://www.pg1n.nl/articles.php?lng=nl&pg=144

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KC9KEP
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« Reply #3 on: April 06, 2012, 04:29:20 AM »

Hello,

I've built Kitchin's receiver for 2-meters .. probably similar to the 6 meter design.

As he stated in the 2-meter literature, it is an experimental rig and requires
some careful tweaking when tuning.

I thought it was a fantastic design, doing all that he had professed.

Yes, it is weak in the audio volume department, but that's easily fixable
with another stage of gain.

I was able to pick up the local 2-meter repeaters and aircraft, no problem.

I even found an online recording of a seminar that he had directed about the design.

Sorry, but I didn't post any photo's :-(

73!

--KC9KEP
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KC2VDM
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« Reply #4 on: April 06, 2012, 09:30:56 AM »

I like Kitchins design also, I think I'll give that one a shot sometime. Thanks for the help guys.
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JAHAM2BE
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« Reply #5 on: April 06, 2012, 08:10:55 PM »

I even found an online recording of a seminar that he had directed about the design.

Is that the following seminar, or did you hear a different one?

http://www.archive.org/details/UpdatingClassicRegenerativeAndSuperRegenerativeCircuits

Quote from: KC2VDM
I like Kitchins design also, I think I'll give that one a shot sometime.

Just don't give up if it doesn't oscillate at first. I built the receiver once with a sloppy layout and it didn't oscillate. I rebuilt the whole thing with inputs separated from outputs and shorter leads, and it started oscillating. If you can hunt up the later article from 2000 that uses a tapped coil, that one should reportedly oscillate more easily.
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K1ZJH
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« Reply #6 on: April 07, 2012, 08:56:17 AM »

If you want tubes, why not a tube converter into an inexpensive ham receiver??

My first homebrew project for six meters was a 6J6 dual triode working as a tuneable oscillator
and mixer section into an old Lafayette KT-200. It worked fine for AM! As a young kid I was amazed
to hear stations in Florida banging into my CT QTH!

Pete
« Last Edit: April 14, 2012, 06:40:11 AM by K1ZJH » Logged
KB1GMX
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Posts: 786




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« Reply #7 on: April 07, 2012, 09:00:59 AM »

I have but  there is an easier way.

Ramsey sells a superhet kit for the 108-136mhz aircraft band.
it would is a trivial task to mod it for 50-51mhz.

I just did that to make a portable 6m am rx.  Works well.

The mod is to alter the input tuned circuits for 6M and the tuned
circuit for the NE602 LO (1 coil). 

The result is a sensitive AM 6M RX that has selectivity far better
than a regen.


Allison
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N2LXM
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Posts: 74




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« Reply #8 on: April 07, 2012, 04:12:46 PM »

Check out Alltronics.com, look under Amateur Radio, Part number 92A067. It an Sic Meter FSK receiver. I purchase one a few years ago to build a Six Meter monitor. I changed the crystal, took the audio off before the FSK circuit, added Squelch and audio. Worked well for what I needed at the time. And for $10.00 most of the work is all ready done for you.
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KB1GMX
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« Reply #9 on: April 07, 2012, 07:29:55 PM »

The board noted by N2LXM is a FM receiver.  Incredible price and all but
will not receive AM well.

The Ramsey kit is a aircraft band AM receiver.


Allison
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N2LXM
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Posts: 74




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« Reply #10 on: April 08, 2012, 07:33:48 AM »

Yes the receiver as purchase is FM. But I took out the Discriminator and built a simple AM detector and BFO so I could monitor a local beacon. Nice little radio for the money.
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