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Messages - giboni

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1
Test Equipment / Re: RF sampler / demodulator for oscilloscope
« on: May 23, 2018, 11:19:45 PM »
 :)

 Looks easy to build. Am going to use a steel electric conduit box to put it in.

Apparently. For lets say 1KW+ on AM. I need to use larger resistors. What value and watts could they be ?

Best John

2
Want Adds / Re: Looking for a Working Communication Service Monitor
« on: November 19, 2015, 12:57:01 AM »
 :) I am familiar with the BK. The Local CB Shop I will make your radio loud snake oil golden screwdriver has one. Actually got a lead on a Ramsey

 Com 3. $300. shipped. Hopefully it is still available.

I want something that I can use on other bands besides 11 meter & free band ::) The BK is a drifter. Just got rid of a drifter.The BK is most

definitely worse than what I just dumped on Ebay. A Com 3 working would be an entry level professional radio service monitor. Let me see if you

answered my other posts !

Best John

3
Manuals / Re: Com Ser Lab BR1000a Service monitor schematics
« on: November 18, 2015, 10:18:11 PM »
Hey. I need new glasses ! But I could see the difference ! Tomorrow will research & keep my fingers crossed. Name address on main unit. Probably the

 builder of the scope. Soooo is the read write switch the secret to using the frequency counter on the unit to check frequencies ? Is their anyway to check

the frequency output of the SG ? Unfortunately. Barely can hear the 1KHZ tone. Not sure if it is modulating the signal. However it does appear to be

 pretty close. I successfully used it to align the IF's of one of my Cobra 139XLR radios. This one is in my car. Whoo. A 3DB improvement. I added a

 ladder filter a few months ago. A few weeks ago repaired a factory defect on the receive. Still. A lot of patience until the unit decided to register 27.1850.

I re-capped this radio also. Sooo. If the SG keeps working. I will not beat it with a baseball bat LOL !

Where do I purchase these oil filled Caps ? The large I guess is 3KV .01uf . What about the small one ? All the other components look OK. Frankly. This

is out of my league. I need something more usable working. I found 600V oil filled for $3.95 each. Shoosh 3KV lets see off to Google !

Best John

Ah time for sleep. Why is oil filled so important ? What about this Tecktronix Scope part ? 5.95 4KV.


4
How CB radio works / Re: The homemade service monitor
« on: November 18, 2015, 11:24:54 AM »
 :o :-X :P :-\ :-*

An old thread. Posted in want section before I saw this. Yesterday in the cold in a little garage I rent. Decided not to hit with a

baseball bat my new used vintage service monitor. I actually thought a few weeks ago. Why not use a CB radio & make a signal

generator etc. Computers. I got plenty of chassis & power supplies. Meters etc. Old Probes. Home made RF probes. yada yada.

multi meters. Does not look like the person completed the thread. Oh well.

5
Want Adds / Looking for a Working Communication Service Monitor
« on: November 18, 2015, 11:13:59 AM »
 :o

Well. Going to keep working on my current Boat Anchor. It is useable. Need something with a Frequency Display LED LCD or dedicated output Jack for a counter. PLL preferred. Something that does not drift by the second.

Need it to service my vintage CB radio collection. Need one with the manual. Price is a major consideration.

Thanks Best John

6
Manuals / Re: Com Ser Lab BR1000a Service monitor schematics
« on: November 17, 2015, 10:38:56 PM »
 :o :o To much work LOL ! Will look for 40 Pins & hope its Plug & Play.

Is their a way to connect an external Freq counter to check the freq out of the Signal Generator ? It appears that is all that is working on my Unit.

Can the internal FC be used to measure frequency of IF or synthesizer outputs ? If so. How do I connect ?

Scope; 450v 47uf both OK. two of the oil filled are Ok. The third with same part numbers is weak. The small oil filled Shot. This could be the issue

on this scope. Photos attached. No obvious Heat related damage.

7
Manuals / Re: Com Ser Lab BR1000a Service monitor schematics
« on: November 17, 2015, 10:30:40 AM »
Hmm I will post later the correct serial number. I think that the scope module on my unit is different. When I upload the pics you can determine.
It is an 8 digit LCD display. Saw the pic on your other webpage Off to Ebay !

Best John

Well my search on Ebay was fruitless. However; What about simply purchasing a cheap 8 digit calculator from Wall Mart ? One with similar

 dimensions ?  Then removing the display from the calculator ? 8 digit 1 line LCD display.

I do not want to remove mine while it is still partially functional. Can you give me the specs off your damaged unit. I will then go to WM & see

 what I can find. I have somewhere old calculators with 8 digits large somewhere. I bet goodwill Salvation Army Thrift is over flowing with these

 calculators.

8
Manuals / Re: Com Ser Lab BR1000a Service monitor schematics
« on: November 16, 2015, 11:17:30 PM »
 :o Almost gave up joining !

Yesterday started taking apart my unit. Just as I thought. Scope assembly is separate. Looked very clean inside the scope unit. No heat markings.

 Careful visual inspection. No burned resistors or anything visual. Eletrolytic Caps look good. Checked the plastic connector on main unit. AC

going to scope unit. If I could be so lucky ! Tomorrow check the on off switch on the scope. Then fire it up with AC. But that's it for now. Sold

 my entry level Ellenco SG-9500 RF signal generator on Ebay. So Im in it for the long run ! With my new Boat Anchor Radio service unit!

Mine was built in 5/1981, Serial 559 I think. Forgot to write it down.  A previous owner. Scratched his address & SSI # underneath the scope.

on top of the second unit. Will try to contact. You never know. Might still have the manual !

Using a doughnut torroid with 20 - 25 turns of enameled wire. Will make a pick up for my $8.00 1Hz resolution/accuracy freq counter & check

 to see if she is on the button on 27.185. Then align the receive of upd858 CB radio.

Will print out your previous instructions. Cleaned all the rotary switches. Will upload pictures tomorrow.

Best John


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