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Old 17th July 2008, 01:51 AM   #1
Studio1 is offline Studio1  New Zealand
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Default 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?
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Old 17th July 2008, 02:35 AM   #2
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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.

Click the image to open in full size.
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Old 17th July 2008, 08:47 AM   #3
Colt45 is offline Colt45  Serbia
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well it's going to have to be linear, and ~100MHz... so... 829B.

Good luck finding a kit. haha.
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Old 17th July 2008, 12:05 PM   #4
Zen Mod is offline Zen Mod  Serbia
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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.

Click the image to open in full size.

that's Fred

Click the image to open in full size.
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Old 17th July 2008, 12:25 PM   #5
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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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