Edward Knobloch wrote:
Hi,

No real pitfall with a modern amp, as long as you get one
rated for continuous duty a.m. operation.
You need tubes with a lot of plate dissipation rating,
since a.m. linear is inefficent, maybe 25% carrier efficiency.
Look for a linear with ceramic tubes, a big blower
and a heavy-duty power supply.

You may need an rf power attenuator between the Ranger
and the linear. Most modern linear amps
produce 1500W peak output with only about 65w peak drive.
Your Ranger will produce 160W pep output in a.m. mode
(at 40W carrier). The linear will be producing 375W carrier,
at legal limit, so it will be almost 10dB more output
than the barefoot Ranger. With no modulation,
the linear's power input will be about 1,500 Watts
(assuming 25% efficiency).
A lot of heat will be dissipted from the linear's plates,
about 1,125 Watts.

A T-network made of 3 each 100W lightbulbs may be an OK
rf attenuator at the linear's input, so you don't overdrive it.

73,
Ed Knobloch

Ed
Thanx - this is one of the most usefull replys I have gotten on this
subject.

Lazy Senior

Now I don't want to get you guys too far off track...but.... wouldn't a guy
better spend his time and money on the antenna??? All of the discussions on
power out and S units etc assume that some reasonable portion of his output
is actually being radiated......:)

Hey Lazy Senior... what is you antenna?


K3PID
Ron H.

Ron H wrote:


Hey Lazy Senior... what is you antenna?


K3PID
Ron H.




Ron
Aint nothing wrong with my antennas. I use a 75mtr loop at 60 ft for 75
and 40 mtrs. its fed with open feeders. A 160 mtr L with 24 radials, and
a beam at 50 ft for 20-10 mtrs. I also live on a high hill......

I have a solidstate linear which I use with my modern equiptment. Aint
nothing wrong with higher power. If 40 watts carrier is good, 375 watts
is really good. :

Lazy Senior