New here and have a question...

[AudioShockwav]

I have not run across a "Samdo" radio in the past, that is a unknown one to me.

The Johnson was a popular radio, used a MSC42502P PLL

a lot of the 40 channel Johnson rigs used that chip, it was custom made for Johnson, It could be modded by changing the BCD programming. The Sams is #182. I would pick this radio over the rest.

The cobra is one of the newer sound tracker rig`s I doubt that the Pll is easy to mod.



73

Jeff




CDX 339

RadioActive

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[AudioShockwav]

<blockquote>Quote:<hr>Please bear with me for this next few questions gang -<hr></blockquote>



Not a problem, we all started at this point!





<blockquote>Quote:<hr>What is a PLL - I gather it's a chip, but I'd like to understand this better.<hr></blockquote>



Yes A PLL( phase lock loop IC) is a "chip" or "IC", an Integrated circuit device.



<blockquote>Quote:<hr>What is the BCD programming?<hr></blockquote>



BDC is a buzz word the means binary-coded-decimal , some of the "pins" on the PLL chip are turned on or off(pulled high or low) to select the " binary code" that tells the radio, (if you will) what frequency (channel) it is on,the channel selector in the radio, switches the pin`s in a specific order to allow you to have all 40 channels. some chips can be modified to allow you to use "other frequency's" such as changing the radio to work on the 10 meter ham band instead of the CB Band. Some guys have been known to modify the radios to work on the frequency's above or below the standard CB frequency's(please note that it is against FCC reg`s to do this in the US)Etc.

This is not even close to telling you how a PLL circuit works in a radio, I am just trying to get the point across to you. If you want to learn about PLL`s and how they work in CB Radio`s I recommend you read a book by Lou Franklin called "The PLL data Book" it is simple to understand and cover`s the basics. That and read all you can on electronics, radios Etc(reading is a good thing <img src=http://users.joplin.com/dutch64804/posticon25.gif ALT=":25"> )





<blockquote>Quote:<hr>Why would I want to mod this?<hr></blockquote>



You probably don`t, unless you want to convert the radio to 10 meters( and most of that band uses USB or upper-sideband anyway) but a lot of guys want to know this info.....as you get more involved in this radio-nut's-o-crazy thing you will see what I am talking about <img src=http://users.joplin.com/dutch64804/rollingaround.gif ALT=":rollingaround"> for now I would just get one of the radios going, I would concentrate on the Johnson, they have good Audio, if working properly, they tend to work well and sound good Johnson was a very reputable manufacture of radios. Get it set-up with a good antenna and go from there.



<blockquote>Quote:<hr>What is Sams #182?<hr></blockquote>



A Sams # 182, is a SAMs Photofax. It is a service manual that contains schematics, alignment procedures, and such to allow a tech to work on the radio.

I hope some of this helps!



<img src=http://users.joplin.com/dutch64804/posticon21.gif ALT=":21">





73

Jeff


CDX 339

RadioActive

</p>Edited by: <A HREF=http://p067.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=audioshockwav>AudioShockwav</A> 

at: 10/24/04 5:05 pm

 

[Moleculo]

SportsguyCB



What kind of Jeep is it? I have a TJ that I made a custom antenna bracket for. I have one laying around somewhere. It's a little overkill for a 3' antenna though, but if you want to run a BIG antenna while you're not wheeling to really be able to talk, then swap it for a little one, it may be just the ticket.



I have a pic laying around somewhere if you're interested...



Moleculo


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[Moleculo]

The bracket I made is for a TJ (wrangler), so I really don't think it will work on that Comanche.


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[Moleculo]

#1. It's probably worth getting looked at to see if it's something easy to fix. If it's going to be more than a couple bucks, I say buy a new radio. Problem is, it might be hard to find someone to diagnose it for minimal cost. You can always send it to F.G....



#2. If an LED can be found, it wouldn't be hard to fix. Problem is finding the LED.



I'd just give F.G. a call and explain both radios and see what they would charge or if it's even worth it.



Moleculo


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[AudioShockwav]

<img src=http://users.joplin.com/dutch64804/posticon55.gif ALT=":55">

<img src=http://users.joplin.com/dutch64804/wav.gif ALT=":wav">





73

Jeff


CDX 339

RadioActive

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[ButtFuzz]

That SAMDO unit looks the same as a Realistic TRC-452 to me. Probably a uPD858 PLL inside. Chassis by UNIDEN.



If you need any assistance with truth charts regarding straight binary or binary coded decimal, there is some info on my website:



www.smlec.com/cb


_____

Buttfuzz in the Mobile</p>

 

[sportsguycb]

I just got 4 CB's from an auction I won on eBay.



I snagged the following units for a $42:



~ Cobra 18WXST w/mic

~ Radio Shack TRC-444 w/mic

~ Johnson Messenger 4145 w/mic

~ SAMDO SD-700 w/mic, but missing the power cord



Pics can be seen here:



community.webshots.com/user/sports_guy



I'm looking for any info anyone can point me to about the SAMDO unit in particular - I cannot find anything online about them...



Thanks for your help to a newb.



I'm going to go run some searches here now.








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