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-   -   FM transmitter / PA (http://www.diyaudio.com/forums/tubes-valves/126489-fm-transmitter-pa.html)

Studio1 17th July 2008 01:51 AM

FM transmitter / PA
 
I have a 7 watt FM PLL exciter that I'd like to drive into a tube amp...

Something between 5 and 50 watts would be ideal. I don't have the workshop facilities at the moment to construct anything so a kit would be a better option.

Can anyone suggest something?

DigitalJunkie 17th July 2008 02:35 AM

An RF tube amp kit? I'm not aware of any. There are some SS kits/modules available.

Perhaps try looking at some of the older HeathKit 2meter amps,it's not too difficult to 're-tune' it to the 3meter (FM broadcast) band.

Aren't you only (legally) allowed around 300mw in NZ?

Edit:
Here's a small ~1W amp,built using a 6AK5. It only needs 10-20mw of drive.

http://i199.photobucket.com/albums/a...p/vhf1watt.gif

Colt45 17th July 2008 08:47 AM

well it's going to have to be linear, and ~100MHz... so... 829B.

Good luck finding a kit. haha. ;)

Zen Mod 17th July 2008 12:05 PM

Quote:

Originally posted by DigitalJunkie
An RF tube amp kit? I'm not aware of any. There are some SS kits/modules available.

Perhaps try looking at some of the older HeathKit 2meter amps,it's not too difficult to 're-tune' it to the 3meter (FM broadcast) band.

Aren't you only (legally) allowed around 300mw in NZ?

Edit:
Here's a small ~1W amp,built using a 6AK5. It only needs 10-20mw of drive.

http://i199.photobucket.com/albums/a...p/vhf1watt.gif


that's Fred ;)

http://choky.on.neobee.net/images/fred_n.jpg

Frank Berry 17th July 2008 12:25 PM

In the past, I have used the PA from an old 160 MHz two-way radio.
I increased the number of turns on the input and output tanks (by nearly 100%) and retuned.
As I recall, I used the PA strip from a Motorola radio and built a new power supply.
It worked well.


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