Search results

What are some of the ways people know of building a simple signal jammer? An old radio on a car battery does not count, unless it uses a 555 timer triggered by the signal meter to key the radio for 60 seconds after the agitator keys up. We have a real winner around us let me tell you.

Hello all. Does anyone know where to get transmit and receive crystals for these old beauties? I need them for channel 28 and maybe channel 35. What are the trans / receive frequencies for these crystals? Also does anyone know of a way to lower the carrier on these old radios?? Thanks in...

Does anyone know what would cause a CPI CP 2000 Base to transmit on AM while in LSB and receive in LSB mode? In am mode it will only deadkey with no audio but receives in am fine. Thanks for any help on this rare bird.

Has anyone here attempted to use a NVIS, (Near Vertical Incidence Skywave) antenna on 10 or 11 meters? If so what was it? A dipole close to the ground? How close? how well and often did it work? Really interested in trying this and I am going to but was just curious.

Just curious if anyone has any experience with building a home brew 1.1 balun for a quad that can handle higher power, say 10KW. I know you can buy them and I have built smaller ones for various antennas. I would rather build this one as well. I am planning on building a 4 element quad for 10/11...

Checking interest. I have a 6x2sc2879 joker amplifier that I am thinking about selling. It has a large heatsink, smart fan (2 speed) and regulated class AB biasing. The amp is less than a month old and has been keyed a few times to test it. It is super clean in appearance and its signal as well...

Why not start a discussion about the various bias designs, filtering and just basic theory based around transistorized RF amplifiers. Swap ideas, schematics etc. etc. I will start off with my first intro into it. How many of you guys use a transistor to turn on the bias supply at keyup...