FM transmitter / PA

Studio1 · 17th July 2008, 01:51 AM

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.

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.

that's Fred

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.

17th July 2008, 01:51 AM	#1
Studio1 diyAudio Member Join Date: Jul 2008	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?

17th July 2008, 12:25 PM	#5
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	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. __________________ Frank

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17th July 2008, 02:35 AM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	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.

17th July 2008, 08:47 AM	#3
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	well it's going to have to be linear, and ~100MHz... so... 829B. Good luck finding a kit. haha.

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