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Thanks 399 for the above information. Ok let me find out if I got this right. Target Transistor is 2N5770. Monograms Oh Lordy. No simple way to figure Ft. Ft = 900 at 100MHZ I am totaly Lost. Alright. After looking at 4 different manufacturers data sheets got this. 1800 MHZ so HFE =...

Just picked up an early 8719 Washinton base with similar issue. As it turned out. During its life someone put a PE Mod with the final volted. 2 watts. They had a 2sc2166 driving a 2sc1969. The 2sc1969 was bad. Several caps were out of tolerance. The original is a 2sc1306 driving a 2sc1969. I...

Okay, An old thread. Just maybe 399 might have some information ! I purchased off FleaBay a talkback speaker with hookups. Works fine on the Cobra 19 VI which is a test jig for Mosfet finals. Works on an old Uniden Pro 510 that I use as a test fixture for NPN Bipolar transistor finals. But...

:whistle: Thanks a lot ! 399 you obviously know how to read the spec sheets of these transistors. What about the above circuit using a pair of BC347 ? It is hard and to match up transistors. The circuit above with resistors matches the BC347's. Now that I think of it. Pairing 2 2sc1370L ! I...

Old Thread, Maybe might catch 399's attention I have several 858 radios. Just picked up for $20. A Washington Base two push buttons 858 chip. Replaced the 1307. Replaced the AMC diode limiter that had been cut. She works ! Still a Golden Screwdriver but getting better fast. What do you think...

Hi 399, Thanks for taking the time to post the Links. I actually found the first one after posting here. The web page author states raising the Trc 457 power Supply to 14.8 Volts ? Has to be a misprint. The original 3300uf in my Trc 457 was Bulging. I replaced with 5 x 1000 uf. All I had...

The thread is not that old. The wayback machine does not have a copy of the webpage link posted above. I have a working Trc457 Navaho that I just recapped and aligned. I would like to expand the frequency coverage. 80 up 40 down without buying an expensive kit if at all possible. Maybe the...

Funny stories ! Well here is a true recent one. This past Halloween ran out of cigarettes. I was frustrated with a no R/TalkBack/PA audio issue on an old Galaxy 959. Drove to a 24 hr Wallgreen. Now this is supposedly the Heartland State. Propaganda. Its all Phony and learned behavior. Most...

Hi Tramdr, You are quite knowledgeable . Judging by your many U-tube video's I stumbled across. Also numerous posts. Can you part with a copy of the Service Manual? I have a good chunk of it. Unfortunately the person who sent it to me had a computer crash. So missing parts. In my opinion...

My CPI 2000 developed issues. So Im running a ARF 2001 in my little car. Stock no Channels. https://www.facebook.com/pages/Pitbulls-CB-Repair-Shop/236853706487570

Hi, Happy thanksgiving ! I am an old Golden Screwdriver. I have had quite a few radios. The Keepers. My favorite. CPI 2000 Base/Mobile Developed issues a few weeks ago. No go finding a Tech sooo improving my skill sets. Might get it running in a few weeks. Running it in my Car ARF 2001 now...

:mad: Happy thanks giving ! An old thread. Well a Voltage chart. Ok. Changed out AF to NTE 153, changed out audio ic, upgraded voltage regulator. Tx with modulation. No RX, No PA & talk back audio on internal or external speaker. Anybody have a clue? Thanks in advance. 73s John

Hi, Doggedly looking for the service manual for this radio. I have the original Manual with schematic. Willing to pay a reasonable price for the manual. 73s John

Hoiw about a used CPI 400 Mobile..........:)

Hi, Just blocked him on my ebay account. Doe this person have any other accounts on FleeceBay? Best 73s

Hi, On ebay REAL cheap. .01uf 50volt disc capacitors On the + of the speaker solder 1 to ground. Ferite chokes 10 pieces just a few bucks from 3MM and up. ShitShack is expensive. Put these on all + side wiring going to the Alarm station. Place more .o1uf caps on all + terminals. Also .68 ohm...

Synthesiser Board issue ? CPI 2000 Base Mobile Need Help. Waiting for the Sams Photofact #268 for the CPI Mobile 400. Hopefully this will assist in the resurection of my daily drive C.B. ! Am not allowed an Antenna where I live. Perhaps an enthusiast of CPI might have experience and a...

Hi, Willing to pay modest REASONABLE fee for Copy. Not the owners manual. Have one with Schematic. 73s John