PCS-Electronics

MFJ 945E 1.6-60MHz 300W antenna tuner can work in the upper region of MW (1593 and up)?

Do you import Autek antenna analyzer?

Thanks!

many thanks for suggests, I've see some interesting objects, too

maybe I've defeated the law... but my tx 0.8W whit a dummy load in very open space make about 100-120 meters.

Coaxial cable was only 2 meters.

Hello all, it can be a silly question, but I'll try...

What do you think about "portable" antenna for MW? Of course with a tiny fraction of power irradiated (with a tx about 500 mW- 1W out) and 200-300 meters (at best) of rx radius...

With a car, is better a (very) short vertical antenna (1.5 - 2 ...

This is what I'm talking about. Now you're in trouble and want to move more
into non-linear region to prevent overheating?

Yes, you can do that, but modulation quality suffers.
This is why my approach is better.

Eh eh, ok... you are true of course.

I think that for now this is the way (I think ...

With AM you need 4x the carrier power in modulation peaks,
which means you will get 30W/4, which is 7W carrier at best.

Lots of trouble for a result that will likely dissapoint you.

Oh yes, now I've understand what do you mean :o (transistor total failure!)

what do you think about AB class ...

I've make some test with a 2SC2078 with a very ugly and simple mine schema (680 ohm 1W resistor plus 1 KOhm trimmer in series from base to collector, an "rf" choke positive Vcc-collector, 10nF capacitor from cold side of choke and earth, in/out capacitors and a BIG fan)... with 70 mW in I've ...

(CUT)
Its just a bad way to go about it. Its much better to modulate the output
stage directly.

Yes, you are true. But sometimes linear amplifier can be useful, for example with small PART 15 transmitters (100 mW max output) that works good and stable (pll or quartz controlled).

I think that a ...

Can you point me in the right direction? I need a (simple) schema for a not so big power linear amplifier for AM Broadcast... for example... 100mW in 2-5-10 W out.

A class A would be very nice also, maybe with cb final transistor (2SC1969, 2SC2078, or BD135, BD329, ecc..).

I've tried only one work ...

Hi
I am trying to locate plans for a low power !/2 to 1 watt fm.
Also I have a dumb question. Would a 5 watt am amplifier work on fm?
Thanks For any possible help
Ken

5 watt am amplifier? where is? :o

Do you mean AM Broadcast (530-1620 khz) or CB?

I search AM broadcast amplifier projects ...

I have now completed a new Isotron for the lower part of the MW band on a 160mm PVC waste-pipe. SNIP


VERY INTERESTING!

Can you point me in the right direction about frequency vs. lenght reduction loss (from capacitive hat to capacitive hat) vs. efficiency?

My frequency is 1602 khz but I haven ...