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I need some info on negative voltage power systems. I ran into a very complicated power supply system that I had to install. This system was engineered by a guy that designed microwave systems and has alot of the components powered by a negative voltage. The thing I could not understand is...

I recently got 8 of these and don't need them all. Labels say Motorola HF/SSB automatic antenna tuner....modelT1961a These are automatic HF antenna tuners for a long wire antenna. They come in a weather proof box with coax connector/power at the bottom and long wire connector at the top...

I have a working 800 to 900 meg single band cellular BDA for sale. This is a working BDA that was pulled out of service because it was single band ( didn't work with Blackberries) Gain is 60db with built in ALC to prevent oscillation. PM for more details

I have 2 CSI controller/patch I want to sell. First one is a CSI model 8300R repeater controller and duplex interconnect. Great for a tone board or phone patch The other one is a CSI MicroPatch model 9800D....Multi mode interconnect...untested and missing top pannel. Has built in dtmf...

I have 2 sinclair model q4220e duplexers for sale. Will tune up between 800 and 960 meg ( might tune lower or higher...possible 700mhz to 1 gig ) and can handle up to 45 mhz separation. Low insertion loss RES-LOK cavities with low insertion loss ( under 1db) Can be tuned to desired freq with...

I looking into whats available for diplexer schematics for cellular freqs. I need to diplex uplink and downlink GSM cellular frequencies. If anyone has any ideas please post em. Any and all links or ideas are welcome

I posted this at another forum ...but once again, no one was really interested in checking it out. Its kinda a crappy video, but basically I am using an Anritzu to check the input tuning of a snowcap 4 pill. I think the input tuning ( stock before me adjusting) had a return loss of about 1.9...

I posted this video on another forum.....but it seems that nobody was really interested. Hopefully someone will be interested in checking it out here. In this video, I am sweeping a rotten old Drake filter. There is no label or indication of what type of filter it is. I used the Anritzu Site...

1 pill 1446 Switchable class ab/class c Switchable low pass filter... cutoff at aprox 50mhz LED power/modulation bar graph display meter made out of 7 leds..... display is adjustable inside the amp. Rx pre amp Automatic ssb Its made to be mounted under a radio.... the size is only 2 3/4...

I need a schematic for a Zetron 35a micro controller. If anyone has one please let me know asap. Thanks in advance

I'm looking for a schematic for a Zetron 35a micro controller. Thanks in advance

So here is one that I have been pondering over in my mind... These mosfets (erf2030) by ekl that seem to becoming fairly popular latly have interested me since they came out a while back. This is my thoughts on the subject.... In most circumstances fets are used in an exact oposet way than how...

We are looking to expand and get alot more stock and try out some different stuff than we already do Basically, I was just curious whats selling good at all the other shops?.....especially the ones in the US We now have a real big showroom and want to get into online sales as well (not many on...

I know there are quite a few hams on this site and alot of guys into sideband as well-- I was wondering if there was anyone out there thats been playing around with ESSB--enhanced single sideband-- or anyone that is using a higher bandwidth on ssb I got to hear what it sounds like a few months...

Does Dave still make those "Rod Of God" antennas? If so what do they usually go for? Also-- looks like there is a glass capacitor of some sort close to the coil-- how strong is this? Any other info on these is appreciated Thanks in advance

I was told that a long time ago there was a tech that worked with Bill Good at his shop that was named Justin-- i was just curious if that was you i was re reading the thread about the 50 watt cobra-- after disscussing this with a few others, Bill Good was supposed to have a similar mod I was...

I keep running into these old trw transistors latly-- always the same one-- guess they must have been cheap in the 80's Anyhow looking for some specs on it-- output,volts, power in etc Its an old TRW 9803 any and all info is much appreciated

Has anyone tried or heard how these Northpoint radios sound? Does anyone have any feedback on these or does anyone own one?

I need a schematic or service manual for a B&K 1040 service master thanks Bushwacker

Just wondering if anyone has ever talked to anyone famous on the cb over the years-- I've hear a few stories-- one that comes to mind is a guy I know talked to Johnny Cash back in the early 80's-- he was driving down the highway talking to the driver of Johnny Cash's bus-- after talking for many...