[AMRadio] AM worldwide

[ARS W5OMR]

I was referring to those plastic radios and their 100w pee eee pee maximum
output finals.  And, not all of those are the same.  IE: the Kenwood
TS-450S vs the Kenwood TS-2000.
I've had a couple of the 450 rigs, and I have a pair of 2k's.
The 450's have a separate power level control and carrier level control.
You -can- increase the carrier on that rig to 100% output and have the
power level to max, and key the rig in AM and produce a 100w carrier.
Leave the power level up, reduce the carrier level to 20~25w and it looks
good on a 'scope.

The TS-2000, on the other hand, is locked, period, at 25w output on AM.  It
doesn't matter what you do, the  'scope pattern doesn't look anywhere near
'normal', until you cut the carrier down to ~6 or 7w.  Even at that,
driving an amplifier at that low level, you're lucking to get it to 100w
carrier output.
The only saving grace in the 2k is that the final -can- produce 100w pep
output but at a capped off limit of 25w on AM, I'm not so sure that's still
the case.
25w out, with the carrier level adjusted to 25w makes modulating that thing
a chore and introducing compression and processor only makes it sound that
much 'nastier'.

The TS-450S worked GREAT on AM into an amplifier.
The TS-2000 ... eh, not so much.

my .02c

73
W5OMR

On Sat, Aug 25, 2018 at 5:48 AM, Rob Atkinson <ranchorobbo at gmail.com> wrote:

> Geoff was I think, referring to 100 watt pee ee pee plastic radios,
> that have to operate at around 20 or 25 watts carrier, and comparing
> those to the ART13.  It's true-- on AM the ART-13 is 4 times more
> powerful.
>
> There is a guy named Bruce, K7DYY who has a small business called
> Index Laboratories, who makes and sells solid state Class D rigs but
> in my opinion overall, tube rigs are still superior to what he has,
> because they seem to be more robust into ham antenna impedances as
> hams usually do not have nice stable and broad bandwidth (in terms of
> vswr) loads.   I've never owned one, but from what I've read and
> heard, they are fussy to operate but are popular with fellows who no
> longer want to deal with the weight of a high power plate modulated
> tube rig.
>
> 73
>
> Rob
> K5UJ
>
>
> On Fri, Aug 24, 2018 at 8:50 PM W2xj <w2xj at w2xj.net> wrote:
> >
> > You have a point but maybe you don’t. It’s obvious that a typical solid
> state rig with a linear amplifier requires 6 dB headroom when driven in AM
> mode. But that doesn’t make them ‘gutless’. If they can make the FCC limit
> of 1500 watts PEP on SSB then they can do it on AM as well.
> >
> > Actually solid state AM designs have more guts than tubes. Class E
> final, switching modulator and higher efficiency. It’s just that no one
> manufactures such a design for amateur service but they are the norm for
> broadcast.
> >
> > Sent from my iPhone
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to ranchorobbo at gmail.com
>



-- 
Operating your AM rig without a scope is like driving our car at night
without headlights. (~K4KYV)

73 = Best Regards,
-Geoff/W5OMR