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Messages - The Radio Shop

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706
CB Radio Repair manuals and documentation / Re: B&K 2040 service manual
« on: August 26, 2013, 07:20:58 AM »
B&K 1040 manual

Added the schematic modified by Lazarus

707
How CB radio works / Re: Understanding how CB radio works
« on: August 26, 2013, 07:18:26 AM »
Thanks bro. Will get back to this one day lol.

708
How CB radio works / Re: Controlled Carrier Stuff
« on: August 22, 2013, 10:23:22 AM »
Hey Tommy.
Good to see ya around. Sort of dead here but trying to get it to pick up a bit.

709
Want Adds / Re: Wanted the Digital display for a kenwood TS 820s
« on: August 04, 2013, 08:15:15 PM »
Hi Paul and welcome to the site. I will ask around here and see if any of my buds have one.

710
Signal Generators / Re: B&K 2040 thread
« on: August 03, 2013, 06:39:44 AM »
I think the varactor diode is tost. At least  it is not changing the voltage to the VCO. Have to rob one from a cobra 29 and try

711
CB Radio Repair Forum / Re: R27 receiver
« on: July 06, 2013, 09:40:55 AM »
Got my new 12AT7's in. Going to try and get back on this today.

712
Shop Talk / Re: Shop tour
« on: July 02, 2013, 04:23:12 PM »
and some more old stuff

713
Shop Talk / Re: Shop tour
« on: July 02, 2013, 04:15:09 PM »
more

714
Shop Talk / Shop tour
« on: July 02, 2013, 04:13:37 PM »
Just posting my stuff here.

715
CB Radio Repair Forum / Re: R27 receiver
« on: July 01, 2013, 10:20:06 AM »
So checked the tubes and dont think the problem is with them. My tube tester says 40% but installed 2 new 12AT7 in the unit and does the same thing. No difference.  I now have 3 units here with this problem.

716
Signal Generators / B&K 2040 thread
« on: July 01, 2013, 10:14:04 AM »
I picked up another B&K 2040 a whilke back I need to get going.
Last time I tested this unit it produced a wide signal on the output and no matter where you set the channel display out it was the same.  However the 455kc section operates as designed.

Someone added a multi 6 position switch to take this unit out of the normal band.  Most likely it has a VCO problem as the 2 10.240 oscilators are working.
I will be poosting my findings in this thread and have attached the service manual.

717
CB Radio Repair Forum / Re: R27 receiver
« on: June 28, 2013, 09:35:05 PM »
Quote from: Lazarus on June 28, 2013, 09:23:57 PM
it makes no sense to me, the red trace on the top looks like just a dirtier version of the green trace on the bottom, plus both scope pics look almost identical, i'm lost bro there should be alot more difference in the two signals, and all of em say 5.xxMhz, it makes no sense, looks like the VFO is all thats working in these pics,

BINGO!

The scopes counter is reading 5 MHz from bother oscilators. There is very little difference in the two signals.
Now remember. I disconnected the 2 oscilators from the mixer and from each other.  I am not sure if this is causing the oscilators to run away or what is going on.  But, My guess is there is something wrong with the 31.4 MHz oscilator circuit.

718
CB Radio Repair Forum / Re: R27 receiver
« on: June 28, 2013, 05:07:56 PM »
Now tell me,
What do you see? :D

719
CB Radio Repair Forum / Re: R27 receiver
« on: June 28, 2013, 05:06:56 PM »
Another test mate.
I have seperated the 2 oscilators. Disconnected from input.
Channel 1 on scope is at top and you will see chan 1 data connected to the 31 meg osc.

Channel 2 is on bottom.
It is connected to the 4 to 5 meg osc.
You will see channel 2 oscilator dat in second pic

720
CB Radio Repair Forum / Re: R27 receiver
« on: June 28, 2013, 04:43:54 PM »
Ok Laz.These 2 were taken at C14 and C22 juntion. First one is channel 23, second one is channel 1

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