H-mode mixers

[k6dgw]

A long thread.  As it moved on and sometimes morphed, I was hoping
someone would explain what an H-mode mixer was, how it differed from
other mixers [a diode?  Product detector?  Double balanced?  Don't ask
me to name any more], and why I should care.  Inquiring minds would like
to know.  In the interest of BW on this reflector which is getting big,
maybe a URL would suffice?

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2007 CQP Oct 6-7
- www.cqp.org
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[Brett gazdzinski-2]

Mixers can have a big impact on how a receiver
works, noise, distortion, overload, and other things.

I don't know about the H mode mixer, but I am sure a web
search would give lots of info.
I did a search on single signal direct conversion
receivers and got a boatload of very interesting
info!

I have not paid much attention to 'modern' stuff, I like
to build things with tubes, otherwise you need circuit
boards, odd parts I don't have in the junk box, etc,
but its very interesting to read about!

I have had good luck with a 6BE6 as a mixer, antenna goes
into grid 1 (after a high Q tuned circuit), grid 2
gets the local osc input, and the 4 frequencies come out
the plate. Only the 455KHz passes through the filter on the output.

I would guess, at least in some respects, the more mixers
you have, the more noise, distortion and problems you can have.

Brett
N2DTS





 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Fred Jensen
> Sent: Monday, May 14, 2007 11:02 PM
> To: Elecraft Reflector
> Subject: [Elecraft] H-mode mixers
>
> A long thread.  As it moved on and sometimes morphed, I was hoping
> someone would explain what an H-mode mixer was, how it differed from
> other mixers [a diode?  Product detector?  Double balanced?  
> Don't ask
> me to name any more], and why I should care.  Inquiring minds
> would like
> to know.  In the interest of BW on this reflector which is
> getting big,
> maybe a URL would suffice?
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 2007 CQP Oct 6-7
> - www.cqp.org
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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[dj7mgq]

> to know.  In the interest of BW on this reflector
> which is getting big, maybe a URL would suffice?

http://www.xs4all.nl/~martein/pa3ake/hmode/
http://www.google.de/search?q=%22H+mode+mixer%22&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official

Colin Horrabin, G3SBI “G3SBI’s High Performance Mixer” - G3VA, Technical
Topics – RadCom October 1993

Colin Horrabin, G3SBI “G3SBI’s H-Mode FST3125 Mixer – Constructional
Details” - G3VA, Technical  Topics – RadCom - September 1998

G3SBI, G8KBB, G3OGQ “The CDG2000 HF Transceiver by Colin Horrabin,
G3SBI, Dave Roberts, G8KBB, George Fare, G3OGQ” – RadCom - June-December
2002.

G3SBI, G8KBB, G3OGQ “The CDG2000 HF Transceiver”-
http://www.warc.org.uk/cdg2000

Wes Hayward, W7ZOI, et al                “Experimental Methods in RF
Design” – ARRL – 2003

Peter Rhodes, G3XJP                    “Pic-A-Star. Software Transmitter
and Receiver”  Part 16, RadCom

November 2003.

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