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Re: [Amps] Ameritron ALS 500M

To: <>
Subject: Re: [Amps] Ameritron ALS 500M
From: "Peter Voelpel" <>
Date: Thu, 3 Dec 2015 18:27:24 +0100
List-post: <">>
As far I remember IMD3 measured -26dB at ARRL lab.


-----Original Message-----
From: Amps [] On Behalf Of Jim Thomson
Sent: Donnerstag, 3. Dezember 2015 13:51
To: Jim W7RY;
Subject: Re: [Amps] Ameritron ALS 500M

###  I stand corrected.   It appears it consists of  2 x 100w modules, with 
a splitter and combiner.
As per usual, kenwood doesn't even mention  TX  IMD...on their spec sheet.

Jim   VE7RF

-----Original Message----- 
From: Jim W7RY
Sent: Thursday, December 03, 2015 12:11 AM
To: Jim Thomson ;
Subject: Re: [Amps] Ameritron ALS 500M

Jim....Better look at the Kenwood TS-480H. 200 watts, 12 volts.

Jim W7RY

-----Original Message----- 
From: Jim Thomson
Sent: Saturday, November 28, 2015 4:43 PM
Subject: [Amps] Ameritron ALS 500M

Date: Tue, 24 Nov 2015 11:09:33 -0500
From: "Mike Feher" <>
To: "'Al Kozakiewicz'" <>, <>
Subject: Re: [Amps] Ameritron ALS 500M

Al -

Interesting comment. It will be easy enough to measure the two tone IMD as a
function of voltage. I assume the higher order ones will not matter as they
should be pretty far down, but, possibly the first and 2nd order may be
worth a look. It is interesting that almost all HF radios in the 100 to 200
watt class are solid state running off of 12 volts. I know in those the 12
volts is not regulated or preset to any specific value. In fact, I also have
a Kenwood TR-450SAT with matching PS-30 power supply. That is about the
worst supply I have ever seen as far as regulation goes. I would think your
comment would apply to all those rigs as well. 73 - Mike

Mike B. Feher, N4FS

##  don't count on it.   it's the higher order IMD that causes all the
problems, like the IMD 7-19.     The ALS-500 is a mobile amp.  The premise
is, in a mobile setup,  signals are not going to be loud anyway, with typ
vert antennas........ vs a yagi on  a tower.

##  There is no 200 watt xcvrs that run on 12 vdc.   They are all 30 vdc or
50 vdc.

Jim   VE7RF

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