[Elecraft] Mod for AM?

Thu Aug 14 16:07:01 2003

Trevor is absolutely correct.  A Timtronized Ranger, for example, can 
produce AM audio that anyone can be proud of.  If you're interested in AM, 
I would advise not trying to make a duck of the K2; it isn't an AM rig. 
Get yourself one of the Johnson line.  They're great rigs when properly 
cared for.

best wishes,

dave belsley, w1euy

--On Thursday, August 14, 2003 12:38 PM -0700 Trevor Jacobs 
<[email protected]> wrote:

> I beg to differ! A Johnson Ranger, Viking II, Desk KW, etc. can generate
> VERY clean AM!  Also, you can pick up an old Viking II at swap meets for
> under $200. Now, you most likely will have to put a bit of work into it,
> but that's half of the fun with vintage gear. As far as modern rigs
> generating cleaner AM, that's just not true. A corectly set up plate
> modulated rig is far superior, and sounds 1000% better! Most (99%) of the
> solid state rigs I hear on the air are undermodulated, and sound like the
> guy is talking through a toilet paper tube! There are the exceptions, but
> they are rare. Randy KK7TV has an Icom 781 sounding very good, but it
> took a lot of outboard processing to achive this. AND, we're not talking
> about this WIDE BAND stuff, 6 KHz bandwidth is plenty to sound good on
> AM. Don't nock the older gear just because you may have heard a guy on
> the air that didn't have his set up correctly. The old tube rigs aren't
> "Plug and Play". You really have to RTFM and learn how to set it up
> properly or you will sound bad and splatter, but then what's the excuse
> of the SSBers that splatter up and down the band? Same thing...RTFM and
> get a scope to check your modulation. Oh, and speaking of drift, my
> Ranger stays very stable after about a 30 minute warm up...
>
> 73's Trev KG6CYN
> http://www.qsl.net/kg6cyn
>
> ----- Original Message -----
> From: "Mychael Morohovich AA3WF" <[email protected]>
> To: "Elecraft reflector" <[email protected]>
> Sent: Thursday, August 14, 2003 11:11 AM
> Subject: Re: [Elecraft] Mod for AM?
>
>
> Forwarded to this list at the request of  WB6TMY By AA3WF
> --------------------------------------------------------------------
>
> Dear Stuart & Mychael,
>
> Thanks for replying to my appeal for help & also, thank you for your
> advice.  At work I am unable to reply to the list, so perhaps one of you
> can forward my reply.
>
> I have considered Johnson Callengers, Rangers etc.
>
># 1 They are expensive, #2 They are god-awful obsolete monstrosities that
> overmodulate buckshot up and down the band and drift.  I just don't want
> one in my house at any price.
>
> A modern SSB rig such as the Kenwood TS850 can generate AM that is stable
> and clean without overmodulation.  If it is amplified sufficiently this is
> GREATLY preferable!  Remember AM operates at approximately a 9 dB
> disadvantage compared to SSB, so to get 100 Watts PEP you must multiply
> the power to (8X) 800 Watts PEP.  Johnson Rangers do not "cut-it"
> powerwise. When you get into Globe King 500's or Johnson 500's you make
> the drift + buckshot even more unacceptable!
>
> Any side band rig is an AM generator if the carrier is not properly
> nulled, the problem is that to open up the rig and do this is very
> inconvient and until carefully returned to proper settings makes the rig
> unuseable for SSB.  Yes, generating a carrier + one sideband is THE WAY
> TO GO!  Besides giving drift free and buckshot free operation, it reduces
> spectrum use.
>
> So I say, once again, does anyone have a mod to easily detune the carrier
> null and restore it on a K2?  Perhaps an external pair of wires with a
> toggle switch?
>
> Anyone?
>
> Thanks,
>
> TR WB6TMY
>
>
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----------------------------------
David A. Belsley
Professor of Economics