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Search found 11 matches
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Topic: Portable MW antenna?
AmRadiant

Replies: 7
Views: 12186
PostForum: AM transmitters   Posted: Fri May 12, 2006 8:48 am   Subject: Portable MW antenna?
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!
Topic: Portable MW antenna?
AmRadiant

Replies: 7
Views: 12186
PostForum: AM transmitters   Posted: Fri May 12, 2006 8:41 am   Subject: Portable MW antenna?
many thanks for suggests, I've see some interesting objects, too
Topic: Portable MW antenna?
AmRadiant

Replies: 7
Views: 12186
PostForum: AM transmitters   Posted: Thu May 11, 2006 8:32 am   Subject: Portable MW antenna?
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.
Topic: Portable MW antenna?
AmRadiant

Replies: 7
Views: 12186
PostForum: AM transmitters   Posted: Tue May 09, 2006 11:06 am   Subject: Portable MW antenna?
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 ou ...
Topic: AM broadcast amplifier
AmRadiant

Replies: 7
Views: 15714
PostForum: Schematics - help and ideas   Posted: Thu Mar 09, 2006 10:06 am   Subject: AM broadcast amplifier
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 ap ...
Topic: AM broadcast amplifier
AmRadiant

Replies: 7
Views: 15714
PostForum: Schematics - help and ideas   Posted: Tue Mar 07, 2006 12:10 pm   Subject: AM broadcast amplifier


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 ...
Topic: AM broadcast amplifier
AmRadiant

Replies: 7
Views: 15714
PostForum: Schematics - help and ideas   Posted: Mon Feb 13, 2006 6:03 pm   Subject: AM broadcast amplifier
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 capacit ...
Topic: AM broadcast amplifier
AmRadiant

Replies: 7
Views: 15714
PostForum: Schematics - help and ideas   Posted: Thu Feb 09, 2006 5:34 pm   Subject: AM broadcast amplifier

(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 t ...
Topic: AM broadcast amplifier
AmRadiant

Replies: 7
Views: 15714
PostForum: Schematics - help and ideas   Posted: Thu Feb 09, 2006 10:56 am   Subject: AM broadcast amplifier
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 ...
Topic: fm amplifiers
AmRadiant

Replies: 2
Views: 7026
PostForum: Schematics - help and ideas   Posted: Thu Feb 09, 2006 10:16 am   Subject: Re: fm amplifiers
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? whe ...
Topic: Home Brew ISOTRON
AmRadiant

Replies: 12
Views: 84221
PostForum: AM transmitters   Posted: Thu Feb 02, 2006 10:42 am   Subject: Re: New ISOTRON
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 reduc ...
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