[Boatanchors] Modern AM Modulation techniques

[rbethman]

On 10/5/2015 6:58 PM, Rob Atkinson wrote:
> I was mistaken about the RF module details--the text at the link I
> posted said 64 modules for a 50 KW rig in levels of 100 to 1000 watts
> each and 8 FETs per board.
>
> I don't know much at all about the  smaller solid state rigs.  I think
> they may be pulse width modulated.  I have read about that but like a
> lot of technical stuff, for me reading and understanding can happen,
> but no retention unless I am applying it.  So I can't explain PWM now
> at all.
>
> One thing about broadcast rigs that makes them easier to work out than
> ham rigs is that they only have to work on one frequency.   The guy
> who has been making and selling the ham solid state AM transmitters
> has managed to get one to work on 160 and 75 and now, 75 and 40, but
> the 40 meter part was as I understand it, a challenge.   I don't know
> enough about it to know what the technical hurdles were but it seems
> that the class D rigs are easier to design and build on low
> frequencies.
>
> 73
>
> Rob
> K5UJ
All,

The smaller Solid State transceivers are listed as meeting FCC Type B.

The Manual lists SSB as "Balanced" for modulation, FM as "Reactance", 
then finally AM as "Low Level".

The TS-2000 is no bigger than a 40 CH CB!.  It requires a 24A 13.8VDC 
power source.  It covers 160 through 10 mtrs, then they list it covering 
6 mtrs through 432MHz, (or as they put it - 70cm!).  The only portion 
that "could" be in it would be the 23cm, (or 1.2 through 1.4GHz.), but 
that module is not in mine and is no longer available.

The insides are all surface mount technology!  This is why I went into 
surface mount equipment!  I will be hanged if I'll ever spend $75 an 
hour for labor plus whatever the parts are.

I will continue to move with the technology.  The Amplifier is still all 
tube type.

Things are just getting lighter in terms of the SS portions.

I'm still hanging on to my HRO-50 and an SP-600 for receivers. Whether I 
get to finishing restoration of the R-390A Blue Striper or not, I really 
don't know yet.  I'd like to.

Regards, Bob - N0DGN
[ Old Sarge ]