[Boatanchors] Modern AM Modulation techniques

[Rob Atkinson]

Hi Gary,

I heard that getting an old Gates MW1 on 160 would be hard to do.
for this reason I have avoided the broadcast solid state rigs. (Not
that I have offers to take free transmitters coming in every day.)


On Mon, Oct 5, 2015 at 7:32 PM, Gary Peterson <kzerocx at rap.midco.net> wrote:
>
> One of the last great tube rigs was the Collins 828E-1 (later Continental 315R-1), both known as the “Power Rock.”  Pulse width modulated.  Sounded absolutely super.  Extremely reliable.  I loved that transmitter.
>

Those were rigs with a tube final and a single tube doing switching
right?  The last 1 KW tube rig Collins made (hybrid solid state) was a
PWM rig that ran a pair of 3-500Z in the final and had a single 3-500Z
switching the final.  I have no idea how that worked but I heard the
h.v. from the supply was around 8 KV!

Bob, a ham in Penn Yan PA (forget his callsign) has one on 160.  He is
a broadcast engineer and knows the rig.

> None of the solid state transmitters that I have dealt with are damaged by running into a funky load.  They just quietly fold back if a capacitor shorts out in the antenna coupler at the tower.
>

Maybe this was a problem early on and eventually they made them fold
back.  I always heard that they'd dump off the air if the vswr on the
line got much above 1.2:1

73

Rob
K5UJ