Recent content by AudioShockwav

You should be able to get there, don't forget the channel arrangement is slightly mixed up in the original 23 channel frequency assignment. Not only the alpha channels, there's is the mix up around channel 23 with the frequencies not in numerical order. 73 Jeff

Me, I still prefer bipolar transistors but most of them are gone, that's primarily why I have old stuff. There are guys building with switching mosfets and they seem to have a handle on them, there are now amps using them close to the KW range. Hg is about the only source for 12 volt stuff and...

The 1446 it is a good transistor, it's actually a VHF transistor that works very well at HF frequencies around 28 MHz. Rated at VHF frequencies for @70 watts it produces about 25% more at 28 MHz. In the past the MRF 492 I considered to be the top of the transistor pile before the Toshiba 2879...

Merry Christmas and Happy DX 73 Jeff

If I had to choose I would take the magnum amp. Better bias if it's one of the original gray magnum amps with the wrap around heat sink. 73 Jeff

No, it's the same as a dx-250 with a different faceplate, the Black Widow 350 is the dx-350 different face. Here is the list from cbtricks. 73 Jeff

Ok, I been super busy but I found this very old thread, it is littered with bantering back and forth but contains some really deep digging into the 2n2999 / diode mods. If you can stand digging through it to find the nuggets. It started with how to do the mod them progressed...

I noticed that the OP is in Germany, I have no idea what the legality is running low power FM. 73 Jeff

It's a violation if you are blocking a licensed FM broadcast station, we can run 100 watts ERP on a LPFM station here in the us but it still requires a license, and at the moment they are not accepting new applications. 73 Jeff

Here's the NB thread https://www.worldwidedx.com/threads/cobra-29-ltd-classic-schottky-diode-mod.228657/ The subject radio was a 29 but the info is useful. There's another one about the low noise transistor used to enhance RX a 2n2999 or something I can't remember right now. If I find that one...

There's a thread about NB diodes here somewhere that has some information.... Let me look 73 Jeff

Buttermilk biscuits, ya I remember The Big man just dropped this hammer on the northwest tip And I'm reading the mail 4-10 4-10 I been waiting to key this duck pluckin Johnson. Put it on you later, I got to go to the mine The Man in the cold lakes with this big Johnson is 10-7 73 Jeff

The parts come in a kit from RF Parts, NFB2 is for a two transistor amp, I don't know the current cost. Keep the leads as short as possible. Adding negative feedback will help with this but it's no substitute for a properly biased amp. 73 Jeff