Recent content by Plumber-G

I like my 2970n2 but be careful they heat up really fast when you get a case of ratchet jaw <GRIN>

Friend of mine just acquired a Montgomery wards 773 CB, unit has low audio but pretty good carrier. wanted to get schematic or manual to see if I can boost the audio. Thanks for any help

I tested the one I have and it started diminish the signal at 33 mhz and completely stopped it at 38 mhz on the low end it never diminished or stopped. I know I am not using the proper terminology but I think you get the idea<GRIN> Fun Experiment tonight...... Beats watching TV

Captain, I assume to test a filter I would induce a signal from the signal generator to the input of the filter and connect the output to a dummy load with a sampler to the oscilloscope ?? then increase / decrease the frequency to see were the filter stops output?? Is a dummy load necessary...

I have a barkers and williams and never used it how would i test it? Opened the case to see what was in it? Not much except a few coils

I have the N2 and it does very nicely 200w on AM, played with it and you can crank it up to about 300w but then you cant turn it down below 100w, also gets pretty hot if you do that. For the difference in cost I think the N2 has a better cost per watt

I looked at the data sheets between the IRF520N and the IRF530N which I was told was a acceptable replacement, Looks like there is some substantial differences. just for the fun of it I uploaded the datasheets. I also ordered the IRF520N from Mouser

Relay checked out, must be the mosfets??

https://www.el-component.com/mosfets/irf520n Doesn't say it will work in a RF circuit but says replacement. I double checked my work and here is the correct voltages Gate 1.95v Drain 13.2v Source 0v I am measuring with a voltmeter to ground and source is grounded, should have 0 voltage If the...

Hello As Handy Andy said I have a brick <GRIN> But this project won't beat me, once I get it working it will probably wind up in the junk bin. But it is a great learning experience I replaced the mosfet with IRF530N which is supposed to be the replacement for the IRF520N. Now I have absolutely...

Robb thanks for the info found them at jameco for 79 cents each Thanks everyone for your help, will update when i get it together Plumber-G

I think since I have it apart I will pull the mosfets and check them out, just to see whats what. New mosfets are about 15 for the 4 and the unit brand new is $49 + shipping from Italy or Hong Kong. Does anyone know of a better pallet amp to install in a old base station?? I also have a 13 amp...

Milkman suggested a mod to increase power output, What should the power be before the mod?? These are my original outputs into a dummy load input 3.5 watts swings to 6 watts Amp output carrier only 9 watts Amp out with 1000Hz modulation 18 watts Thanks Plumber-G

D6 checked out Do you think I should pull and check the mosfets and check?? If I pull them I guess I should replace them?? Thanks Plumber-G

Diode D6 looks a little iffy rest of diodes checked out fine Power on recieve Gate (-0.12) Drain 13.2v Source 0 Power on transmit on Gate (-1.95) Drain 13.2v Source 0