ARF 2001 microphone info wanted

[TM86]

Going for the longshot. Looking for a schematic for the speech processor board that ARF stuffed inside the base of the D104's they modified. Even a reverse engineered and drawn on lined paper diagram would suffice.

I'm guessing that the microphones themselves have been unobtainium for at least 20 years by this point. A dead one of those would be something to work from, but they're most likely all in landfills scattered around the country by now. Any working ones should be attached to the radio they came with, so I doubt the owner would want to disassemble it just to see what's in it. I'd appreciate it, but the odds are against it.

I've checked the service manual that's available online, nothing there unless I misinterpreted it.

Like I said, longshot. But I figured if anyone had the info, it would be someone from here.

 

[Woody-202]

Going for the longshot. Looking for a schematic for the speech processor board that ARF stuffed inside the base of the D104's they modified.

Perhaps they had 2 desk mics to choose from. The ARF-2001 I owned had a D104 with an ARF tag on the front of the base, but the mic wasn't amplified at all.

 

[TM86]

Perhaps they had 2 desk mics to choose from. The ARF-2001 I owned had a D104 with an ARF tag on the front of the base, but the mic wasn't amplified at all.

Well, that's interesting. Did not know that was an option.

 

[Woody-202]

Well, that's interesting. Did not know that was an option.

Yeah, I didn't know about the amplified d104 either. My Stoner D104 was non-amplified as well.

 

[Enterprise312ok]

I would like to know more about the mic issue. I have 2 freinds one of them has a 2001 he says he cant use because he doesent have the special mic, the other freind has 2 2001s and he said he used a regular mic with the one that he used.

 

[TM86]

I would like to know more about the mic issue. I have 2 freinds one of them has a 2001 he says he cant use because he doesent have the special mic, the other freind has 2 2001s and he said he used a regular mic with the one that he used.

Since July I've managed to get my grubby little paws on a schematic for the custom circuit in the ARF specific D104. It's a preamp that uses a single FET and is powered from the radio at 14 volts via pin 4 of the mic connector. According to said schematic, pin 1 is audio, pin 2 is shield (ground), and pin 3 is PTT which gets connected to ground to key the radio.

For testing I'm currently using a Royce hand mic that happened to be wired correctly that I had laying around. It keys and modulates. How good it sounds I can't say, but it does work.

 

[Holydvr]

Did you ever get any further with this? I have one of the microphones and may be able to help.

 

[TM86]

Did you ever get any further with this? I have one of the microphones and may be able to help.View attachment 71459

I never went beyond getting the schematic. There was another thread around here that someone had said they'd designed a replacement PCB and were going to get some made. I asked for a sample, leftover, etc, and offered to pay them for their trouble, postage, or whatever, but never heard back.

I currently have a D-104 with a TUP-9 stand attached to the ARF. I just like the little push bar. I haven't been ambitious enough to try and replace the circuit in the mic with one that looks like the schematic.

I do very much appreciate the offer of assistance. I just don't want to waste your time tearing into it for me to then not do anything with the info.

Now, if i'm misunderstanding the situation and you're offering to offload it on me, that's different.

 

[Holydvr]

My intent was not to sell it as far as reviving this thread. Most anything is for sale though! Haha I just wondered if you needed any other pictures or anything. Do you get pretty good results with the microphone you have on it currently? I would imagine so, otherwise you may be using multiple microphones trying to find something better.

 

[TM86]

My intent was not to sell it as far as reviving this thread. Most anything is for sale though! Haha I just wondered if you needed any other pictures or anything. Do you get pretty good results with the microphone you have on it currently? I would imagine so, otherwise you may be using multiple microphones trying to find something better.

Actually, yes, I've gotten decent results as far as I can tell. It sounds good to me and I haven't had any complaints. Probably because once I got done testing the D-104 I put the mess on the shelf and moved on to the next victim project.

 

[Probate]

My intent was not to sell it as far as reviving this thread. Most anything is for sale though! Haha I just wondered if you needed any other pictures or anything. Do you get pretty good results with the microphone you have on it currently? I would imagine so, otherwise you may be using multiple microphones trying to find something better.

There are a few of us looking for these boards, I would be interested if you were going to sell a few.

 

[Holydvr]

I do not have multiple boards sadly. Only an original microphone itself.

 

[TM86]

There are a few of us looking for these boards, I would be interested if you were going to sell a few.

I was referencing this thread: https://www.worldwidedx.com/threads/arf-2001-d104-c-microphone-question.268242/

Don't know if the dude ever had any made, he never said. You could pull the schematic that's posted in that thread and do some CAD work to get it into whatever format one of the online PCB makers uses and get some done. I'm too lazy to do that myself or I'd already have some.