Hi All,
I like to inform you that following the K3 1st mixer replacement with a 2T
H-Mode Mixer, as previously announced, a 2T H-Mode Mixer is now available for
the Sub RX.
Following K3 owners request, a mod relative to a diplexer termination fot the
xtal filters bank is available. This is
Hi Gian,
Did you find that your diplexer termination for the filters also prevented
the changing input impedance of HAGC controlled amp Q1 from changing the
Group Delay Variations of the filters, especially the narrower filters?
My apology for not replying to your last email, will explain
: Geoffrey Mackenzie-Kennedy lx...@pt.lu
A: Giancarlo Moda i7...@yahoo.com
Cc: Elecraft Discussion List elecraft@mailman.qth.net
Inviato: Lunedì 14 Maggio 2012 22:56
Oggetto: Re: [Elecraft] K3 H-Mode Mixer Main Sub RX plus other mods
Hi Gian,
Did you find that your diplexer termination for the filters
G'day,
Anyone out there using the K3 H mode mixer. Interested in your
observations.
Regards,
Mike VP8NO
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Hello Mike,
Happy New Year to you, and I hope that Father Christmas was good to you!
Forgive my ignorance, but what is the K3 H Mode mixer, and which type of
switches does it use?
I have been using H Mode mixers in my homebrewed receivers since 1994 with
useful results. For example my most
(Message: 44)
Date: Sat, 07 Jan 2012 10:28:39 -0300
From: Mike Harris mike.har...@cwimail.fk
Subject: [Elecraft] K3 H Mode Mixer
To: Elecraft@mailman.qth.net
Message-ID: 4f084887.5040...@cwimail.fk
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
G'day,
Anyone out there using the K3 H
Hi Jack,
again thanks a lot for the circuit diagram and description of converter.
Thanks for the link to the F6CTE software. I am not using PSK ... I am a
chatter...hi
I believe if something is old it does not mean is not good ... we can always
modify it...hi
73
Gian
I7SWX
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Hi Jack,
OK for everything. I do not know the Bruhan#39;s VLF converter but I guess I
understood how it maybe made.
I have used an MC4066 for an SSB demodulator in my modified FT726R. The Ron is
very high, on the hundreds ohm. I have also used the 74HC4066 to replace it and
also used it as a
Here's the schematic. I purchased it in 1983. I was wrong he used a
74HC4066
http://elecraft.365791.n2.nabble.com/file/n6898162/scan0014.jpg
-
Jack WA9FVP
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Sent from the Elecraft
Here's the circuir description. Again, I was wrong, he called it a balanced
mixer, not a ring mixer.
http://elecraft.365791.n2.nabble.com/file/n6898183/scan0013.jpg
-
Jack WA9FVP
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http://elecraft.365791.n2.nabble.com/K3-H-Mode-Mixer-tp6889343p6898183.html
Hi Jack,
thanks for the circuit diagram and info on the converter. You should not
feel sorry if you did not remember the right IC p/n and type of mixer20
years of space are a long time to remember small particulars...hi
Thanks again for the discussion and best 73
Gian
I7SWX
--
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I still use the Burhans converter along with my K3 to copy VLF. I'm feeding
the converter into the receive input on my K3. Lately I have been using the
MULTIPSK software by F6CTE to decode MSK in the 300KHz range. It's abit out
of the realm of Ham Radio but it's something I've done for years.
Hi Jack,
tank for your question.
Basically the difference between the Ring Mixer and the H-Mode Mixer is:
1) In the ring mixer the mixing is performed by the semiconductors (diodes
or fets)
2) In the H-Mode Mixer the mixing is performed by the transformers. The
semiconductors (FET
The reason that I ask is because I have a Bruhan's VLF converter that uses,
what he called, a ring mixer. The Burhan's converter has a MC4066 analog
switch where the control inputs of two fet switches are inverted and the
other two are non inverted. When I saw the schematic of the H mode mixer,
Thank you very much for your comments.
Wayne recognized interesting results when we reported yhe MDS, DR and IP3
comparison figures. We have to appreciate his comment “A few K3 users in
extremely high-signal environments might benefit from a few extra dB of
dynamic range, at the cost of a
N0OKS wrote:
The price of the H mode mixer is about $193, delivered.
Could someone please post a link to where this mixer is offered for sale?
I'd be potentially interested in adapting it for other radios, not the K3.
Thanks 73,
Barry N1EU
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Hi Barry,
If you are interested in a 2T H-Mode Mixer to modify other equipment, a
different parts kit to be assembled is available.
I have studied and applied mods to different commercial equipment:.. ICOM
(IC751, 761, 765, 781, 775, YAESU (FT1000MP-MK-Field, FT920), KENWOOD
(TS850, TS940),
What's the difference between an H mode mixer and a ring mixer?
-
Jack WA9FVP
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Sent from the Elecraft mailing list archive at Nabble.com.
The price of the H mode mixer is about $193, delivered.
I am surprised there have been no comments on the value of swapping
out the original mixer board for the H Mode mixer.
It appears there is a performance improvement.
But is the improvement really a big deal?
The K3 is at the top of the
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