[AMRadio] Ranger driving SB220


Peter Markavage manualman at juno.com
Mon Feb 11 20:47:44 EST 2008


There was a great article in Electric Radio (Issue 139, Dec 2000, page
25) on modifying the Ranger screen voltage with a variable control, and
even access from the front panel, without drilling any holes in the front
panel.

Works great.

Pete, wa2cwa

On Mon, 11 Feb 2008 19:44:53 -0500 Gary Blau <gblau at w3am.com> writes:
> You can lower the power in a couple different ways.
> Lower the screen, run the PA on the low HV, attenuate the RF, etc.
> 
> If you're driving an amp there's no advantage to running full power 
> in 
> the Ranger.  In fact, you give up a lot of potential positive peak 
> modulation capability, if that's important to you.
> I vote for lowering the screen and making it adjustable.
> Second would be running the PA on the lower HV rail.
> 
> There are numerous articles on line for modifying the Ranger to do 
> these 
> things.
> 
> g
> 
> Patrick Thompson wrote:
> > How did you go about getting the RF drive from the Ranger down to 
> a level
> > usable by the SB220? I'm thinking about something similar to get 
> to the
> > 200-250 watt carrier level (or 800 to 1000 pep AM). I'm guessing 
> the amp
> > won't need much more than 10-15 watts drive (40 to 60 watts pep 
> AM) leaving
> > a little headroom.
> > 
> > I thought about a homemade pad but that's a lot of heat to throw 
> away. Maybe
> > a 3db pad and turn the drive down a little?
> > 
> > I could lower the screen voltage but it would be nice to have the 
> rig full
> > power when barefoot.
> > 
> > Can you get by with just lowering the drive and microphone gain?
> > 
> > Pat
> > wa4tuk


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