Dash speaker size/ cb radio location

[Ifitaintbroke]

You are correct on Mitsubishi, as some of the components have an M and the "triple triangle" emblem.
And, yes, it is momentary.
Another thing, the mic these radios take has an extra switch that can switch the channel. Basically in use the same as the one on the head unit. On the 23 channel, it works, on the 40, it doesn't. In the schematic it is the four pin mic thing. What I wonder is this: if the switch on the head unit is the problem, wouldn't the mic switch still work? Of course, the only way to know that is to see if they are routed together in the schematic.
Bigger question to me is: what part of the radio ACTUALLY switches between the frequencies?
Bear with me on this, I'm thinking in terms of electrical, not electronic.(I went to school to be an electrician.) I'm pretty used to wiring diagrams, such as the EVTM's, but this is virgin territory for me.

[ArdWrknTrk]

Three diamonds. 💎💎💎.

Yes, I see the lead from just above capacitor 504 at pin 14 runs to the mic jack.
The mic button comes before S4.
So if neither the push button or the microphone button works, it's not the switch.
Either the IC is bad or the leg of pin 14 is broken off.

The XTAL OSC UNIT is the crystal oscillator that determines frequency.

IC501 is the common thing that drives both the tuning and the display.
Look closely at leg 14 (phones have macro cameras now) Is it broken or have a cold solder joint?

If you could look at the package of the chip with a IR camera you might see a hot spot.

[Ifitaintbroke]

Traced to pin 14, but the problem it that I can't see the circuitry without removing IC501 from the main board, as it is right up against the XTAL OSC. I may just remove it. A good question though, will IC501 be the same for both the 23 and 40, and just the OSC be different? I would think so. If that's the case, all I have to do is swap the IC501 from the 23 to the 40(assuming that's the problem.

[ArdWrknTrk]

I honestly can't say.
I wouldn't expect it is given that it would have to control twice as many channels.
Do you have a schematic for the other radio?
Is the chip the same number?

Maybe Bill or Gary have something to offer???
I haven't dealt with this stuff in 40 years.

[Ifitaintbroke]

Well, there's not much point in me going any further. I can't get the board off. No matter what I do, I can't get the old solder off that's holding it to the main board. Not that I'm very good at soldering. As for the schematics, there's only one, and it doesn't specify which it is. That somewhat confirms my belief that the main difference is in the OSC, as it's internal circuitry is not shown, therefore another schematic would not be needed.

[Ifitaintbroke]

And the chip number? Well, I can't read it, because it's on the side facing the OSC. Why did I think this would be a fun and easy introduction to electronics?
I'll get over it.
Maybe I can find someone who can get the board loose. Ironically enough, I soldered the pins back in, and that worked fine.

[Gary Lewis]

I'm lost.  Have been reading the mail, but have no suggestions.

However, unsoldering integrated circuits isn't easy.  It is hard to get every pin de-soldered, even using "solder wick", and you have to have all of them "clean" in order to get the chip out.  Plus you don't want to heat the legs very much or you can damage the chip.  It isn't easy.

[ArdWrknTrk]

I got introduced to electronics by bread boarding Forrest Mims projects and desoldering the components on server rack sized boards from DEW Line radar stations.  👴

Gary is right. You need to work quickly and have a deft touch.

[ArdWrknTrk]

Ifitaintbroke wrote

Well, there's not much point in me going any further. I can't get the board off. No matter what I do.
....... as it's internal circuitry is not shown, therefore another schematic would not be needed.

Depending on how it was soldered on (this is all LONG before RoHS compliant lead free solder) it's best to flux first and then use Goot Wick or similar to pull the solder off the back of the board.

There is no schematic for the millions (now Billions) of gates and junctions etched into silicon.
If you did have all the masks you'd lose your mind, or die of old age before you figured it out.

I often say that when reading even simple schematics like in the EVTM, that [solid state] is like having a map where the whole of Africa is labeled "thar be dragons here!"
But some things can be deduced from what pins connect to what.

[Ifitaintbroke]

I'm putting this on the back burner for now. I'll try to get back to it soon but my "workweek" is starting tomorrow. I won't be off again till Monday.

[Ifitaintbroke]

Alright, y'all, getting back to this a little bit now. About to order 102" whip. But, I'm having trouble finding a suitable mount. Everyone seems to use mirror mounts, but that won't work on our flat stock mirror brackets. I can find fender mounts, but none strong enough to handle the 102" whip. Then there are the ball mount types, which swivel 180°, but they list them as for vertical surfaces. They can be positioned straight up, but, again they are listed for a vertical surface. Unsure what to do.

[grumpin]

If you have a step bumper I would mount one of these on the flat top of the bumper. And I’ve seen people use these on a fender. I’d support it inside the fender if possible.

https://www.walcottradio.com/hustler-ssm1-heavy-duty-ball-mount-and-spring-p-2479.html

You’re right, going to need something stout to hold a 102” whip at speed. I’m sure you’ve seen the clips that hold the antenna while not in use.

I’ve recommended the Wilson 1000 mag mount, and it has a pretty long whip on it, 62”, I think. At least it seems long on the roof of my truck.

Edit: forgot the link!

[Ifitaintbroke]

Funny, I just put in an order with them last night. I wonder if the cowl is strong enough for this job. It doesn't move much, but that's a lot of force.

[Ifitaintbroke]

Hey guys, check this thing out: https://www.rightchannelradios.com/products/cobra-19-mini

[grumpin]

I bought a small Uniden Pro 520 and returned it. Noisy and could not get out or receive very well.

I bought a President Bill and that little radio impressed me. Did a radio check after install and talked to a trucker at a local truck stop 5 miles away.

Also wanted to say Walcott doesn't work on older radios anymore, over 20 years old I think they told me.

I bought a Uniden Grant XL and wanted it checked and tuned. Found Superior CB in Ontario California.

Had to wait awhile because he's backed up with work. The CB arrived damaged after repair, contacted Superior and they filed a damage claim and helped a lot. They are sending a check for the cost of my radio plus shipping and the repair, that they got from the shipping company.

Highly recommend them. They also sell radio equipment and accessories.

https://superiorcb.com/general-repairs-service/

[Ifitaintbroke]

Thanks, I'll check them out.

[FuzzFace2]

I got to ask why a 102 wip
From what I remember back in the day they move around a lot so if mounted to the rear bumperit could hit the body and cause damage.

If you go with say dual mirror mount I cant see why they would not mount to our flat brackets.
Been a long time since I had them on a 86 K5 Blazer but had to take them off when work built a parking garage and the ant. were too tall.
On my Durango there was no place to mount a CB ant. and I did not want to mount one or need a CB all that much. Only time I would have a CB was when pulling the car trailer and I would use a magnet mount on the roof.
Heck I dont even use the CB in my work truck, 18 wheeler, as most of my driving is local. Also it does not bring in / reach out that far and I am not spending my money on a Co. truck for something I dont use.
The places I do need it for picking up loads it works just fine.
Just my .01
Dave ----

[Ifitaintbroke]

I went with the whip simply because they are supposed to give the best range, and it was cheaper than a lot of other options. Never thought about body damage, though I certainly don't have any paint I'd be worried about. Still not exactly sure where I'm going to mount it, but I should be getting a front bumper in the next few days, so that's a possibility. Thanks por el inputo.

[grumpin]

I know I mentioned this antenna, but thought you might be interested in what Walcott says about it.

https://www.walcottradio.com/wilson-1000-magnet-mount-antenna-900800-880900800b-p-415.html

[Ifitaintbroke]

Too late! Already have the whip on the F250. That looks like a good option for the Ranger though.