Guide :Radio Communications : 19 DX III 40-Channels Base CB Radio

President mckinly ssb/am model with mb8719 pll chip.

Fault finding need help..transmitt carier on am normal 4 watts no modulation on am and no modulation on ssb usb/lsb.receive is alright.checked mic insert -inside mic etc and other end mic plug all ok their.

Research, Knowledge and Information :


MB8719 & RCI8719 PLL - OoCities


... clarifier,and audio mods for radios that have the mb8719 or RCI8719 PLL. ... PRESIDENT WASINGTON AND McKINLEY ... Locate pin 10 of the mb8719 chip.Cut the ...
Read More At : www.oocities.org...

CB PLL Modifications List - pedrokv.com


Single Conversion AM/SSB US models: ... President P400/Mckinley ... The only way to modify this radio is to replace the RCI8719 PLL with the older MB8719 PLL.The ...
Read More At : www.pedrokv.com...

Extra Channel mods for the MB8719 PLL - Angelfire


Extra Channel mods for the MB8719 PLL. ... PRESIDENT WASINGTON AND McKINLEY AND P400 1) ... Locate pin 10 of the mb8719 chip.Cut the trace that is connected to it. 4) ...
Read More At : www.angelfire.com...

Cobra 148 Replacing the MB8719 PLL | Radioaficion Ham Radio


cobra cb radio 148 Replacing the MB8719 PLL chip with an ... Cobra CB Radio MODEL(s ... to allow continuous 100% duty cycle operation in both CW and SSB modes.
Read More At : www.radioaficion.com...

MB8719 - Galaxy Mb8719 - Phase Lock Loop Rci8719


Galaxy MB8719 - Phase Lock Loop RCI8719. ... President Radios; ... A 6-pin binary programmable chip the MB8719 has proven reliable in AM/SSB radios in the U.S. and ...
Read More At : www.wearecb.com...

Secret CB Volume Ten


Secret CB Volume Ten Documentation Project ... (1010002) with MB8719 PLL: 15. ... President McKinley (1011001) ...
Read More At : www.cbtricks.com...

President Mckinley CB Radio - OzCBRadios.com


President McKinley AM/SSB cb radio. Skip to Content; Jump to ... AM/USB/LSB: PLL: MB8719 Fujitsu: Channels: 18: Rig Report: Manual: CB Action No. 18. McKinley Owner's .
Read More At : www.ozcbradios.com...

President / Uniden Secret CB Index By Model


President / Uniden Secret CB Index By Model ... with MB8719 PLL "VSB-1" Installation: 10. 15. ... President Service Bulletins : Teddy ...
Read More At : www.cbtricks.com...

Suggested Questions And Answer :


President mckinly ssb/am model with mb8719 pll chip.


It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.
Read More At : 19 DX III 40-Channels Base CB Radio...

Pll chip in cobra 148 is gone out


No.
Read More At : 148 GTL 120-Channels Base CB Radio...

148gtl, Taiwan when you modulate the meter swings backwards


In the back is where power mods have been added...It sounds like a swing kit 1/2 watt deadkey to 25 watts which is a powerful modulation exceeding 100%. Its a 220uf capacitor in place of a jumper J1 or J(x) J something in some radios. if you replace the jumper and remove the capacitor 220uf or 470uf one.(near finals it will return to around 4 watt dead key) The result of 4 watts is modulation is flat;where if you adjust it to 2 1/4 watt to say 20 watts it will be very loud and modulation is at 100%.
Read More At : 148 GTL 120-Channels Base CB Radio...

I just unsodered the pll chip on my cobra 25 ltd classic and popped it out and dont remember which way it goes back in and the only way for me to know is how the cobra lettering faces, is it the top of the cobra lettering that faces the front, can someone help please


On the circuit board where your chip was you will see that there is an indentation on one end...your chip also has one....you follow?
Read More At : 25 LTD 40-Channels Base CB Radio...

Cobra 25 ltd will not transmit it will on pa mode and it recieves i replaced the final pll chip audio chip.can you help


There is the problem. a $150 repair bill for a $ 25.00 problem. After you put in this new IC did you put it on a scope to check it out.How about a frequency counter to make sure you were on the right frequency? take it to a tech and let him fix it .
Read More At : 25 LTD 40-Channels Base CB Radio...

Cobrba 148 gtl TX


Thanks sharcnet i just going through the steps in my head trying to figure out what I would do if it was on my bench ..Between the two of us we'll figure it out!!!..... Dean
Read More At : 148 GTL 120-Channels Base CB Radio...

It will not turn on - Cobra 19 DX III 40-Channels Base CB Radio


Check the power going to the power wires. for dc voltage. then if good check the fuse in power wire. if good check the ground for good connection. if good check to see if you have at least 5amps of dc pwr going into the radio. if good has the radio been hooked up backwards. or even just sparked ground or + wire, if so contact us for repairs. that could have blown the protection diode. and will not let the unit turn on. or may have a burnt trace on the board to the switch.
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No power to cb ? - Cobra 19 DX III 40-Channels Base CB Radio


If the fuse is O.K. it could be that the input diode is burned....this is to protect in case of the radio being hooked up powerwise the wires have been reversed. Usually RED is 12 Volt POS. If you open the radio look where the power cord comes in....you will see the diode and I found usually at the Right side of the chassis, that is right rear with component side up. It is usually burned and if you replace it you'll be in business ! ! Goo0d luck.
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Droped channel to 17 and frequency counter don't work?


Sounds like a connection is coming loose inside. take it to a CB shop and see if they can spot it. Should be an easy fix, no more than 20 or 30 dollars
Read More At : DX- 88HL Base CB Radio...

On channel 26 all I hear is Russian. Is there a bad chip in channel 26? Can you replace the channel 26 chip with one that picks up English?


Channel 26 is NOT controled by a crystal,but by a PLL chip and no you can't just remove one channel...You would have to remove the channel chip itself and replace it with another.These radios are surface mount technology and are not meant to be delt with in that fashion. Take it to a good qualified tech. That person should be able to help to some degree.
Read More At : 79-290 120-Channels Base CB Radio...

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