[Amps] 160m mod to SB220

[kg7hf at comcast.net]

>oh yes!  in fact virtually 100% of the freqs are outside the ham bands 
>and  probably 50% are outside the capes of the 220 which are set for 
>the ham bands. 



I don't think there are any mars frequencies that fall inside the amateur frequencies. 







What happens when you try to tune up the SB-220 on one of the mars frequencies? 



I would think you can easily tune the SB-220 to say 3.501Mhz, using the "factory" tune up settings and procedure into a dummy load.   Once it is in tune, start moving down in frequency a little at a teme, retuning the amp as you go.   You'll have to "play" with the dial settings because they are not going to match the normal values.   



Paul, kg7hf 





------------------------------ 

Message: 2 
Date: Tue, 17 Feb 2009 14:25:54 -0600 
From: chas <chasm at texas.net> 
Subject: Re: [Amps] 160m  mod to SB220 
To: Pete Smith <n4zr at contesting.com> 
Message-ID: <499B1D52.5020304 at texas.net> 
Content-Type: text/plain; charset=ISO-8859-1; format=flowed 

Pete Smith wrote: 
> Hi Chas - I routinely run my basically unmodified SB-220 on 12 and 17 
> meters, using the 10 and 15 meter bandswitch positions.  Is MARS now 
> using frequencies so far outside the ham bands that the SB-220 really 
> won't cover? 
> 

oh yes!  in fact virtually 100% of the freqs are outside the ham bands 
and  probably 50% are outside the capes of the 220 which are set for 
the ham bands. 

> I'm interested too in what you unearth about the 160 mod. 

so far, it is a LOT of work unless you are into home brewing<G>. 
best toe in the water paper is RMeasures' 1989 QST piece which you can 
find at http://www.somis.org/add-160m.html 

thanks for the reply 
chas.k5dam 


------------------------------