Hello,
Hello,
I built this kit back in the 80's consisting of the FME 500 Exciter coupled to the FMA 5K amplifier. Now that my kids are older, I dug this out of the attic for fun. The problem is that I have lost all the documentation for the amplifier and I'm unsure on how to hook up the power. I was only a kid when I built it and I see I have two power connections to the amp. It uses two Motorola MRF134s in what appears to be a push-pull configuration. From my connections it looks like this was set up to work on +/- 12volts. Is this possible? All the schematics I find seem to only use Vcc and gnd for all push pull designs. Also, it doesn't help that I don't know how to identify the D, S and G on the MOSFET package ( http://www.alldatasheet.com/datashee...LA/MRF134.html)
Anybody have any info on this kit or can offer any insight?
Thanks,
tychoc
Yes tychoc, there are what I think are called "balanced" power supplies which indeed present + 12vdc and - 12 vdc with a ground bus right between them with 0 dc. I've seen these kinds of supplies in many professional circuit designs.
Unfortunately that's all I can add to your inquiry because I'm not familiar with Panxis 5k - 10k or the FME exciter. Can you give a greater description of what that combination actually is?
Hi Carl,
These were kits sold in the 80's. The manual for the exciter (i.e., 500mW FM phased locked loop transmitter) is here:
http://part15.us/node/458
Along with this kit, I also bought the FMA-5K/10K, which is a 10 W RF amplifier used as a second stage after the exciter.
Here are some pictures of the two kits that I just took. For the amplifier, there are two wires, one black and one red that should be the power. I just don't see why I would have two separate power connectors if they both supplied +12 volts, on the other hand, I don't want to blow up the transistors either.
http://picasaweb.google.com/tycho.castberg/FMA?feat=directlink
thanks,
tycho
how much does the amp put out?
i would also love to have copies of the paperwork that came with the kit to add to my files 🙂
It puts out max 10 Watts.
-tychoc
Tychoc, I have the info you want; I just have figure how to get it to you.
It was a great FM amp!
Steve
www.radiobrandy.com