Night Eagle D104 issues. Help needed.

[CB590]

So my tech wired up a 4 pin and replaced the 8 pin it had on it for a Yaesu 767. He also put the black head on with element from another D104 (see pic of element) MC-320 and possible code date of 9 76.




Anyway. The mic keys the radio up just fine but I get no modulation (aka swing). Seems like a short or something going on. Both of the PTT seem to be keying just fine.

Tech said the following in an email when he had just finished it.



Can a bad element cause this sporadic issue?? I did get it to swing a couple times.

Tech has just suggested removing the back plate in case the tape worn through. Which doesn't seem to make any difference.

The mic is looking great. But not working worth a darn.

 

[Shadetree Mechanic]

Can you try a different head from another D104?

 

[CB590]

Can you try a different head from another D104?

No other head. The mic came with a normal 104 head (non eagle). I then got a Night Eagle head and Silver Eagle rear plate as part of my project. Currently just want this to work.

I'd have no issue shipping it out to someone with knowledge and even letting them do the new element mod I've seen online. I just want this to work.

 

[mrgumby]

I’ve had that happen to the same black head on my knight eagle They put a glued on pad in there to keep the element tight. But they glue the pad right on the element wires after so many years it breaks downs somehow and the glue becomes conductive and the pad gets soft and looks like it is full of moisture or something or oil or liquidy took off the Pad cleaned it up. And. Bingo it works

 

[Shadetree Mechanic]

Have you tried it on another radio? Maybe let your tech know that it doesn't work and see what he says?

 

[CB590]

I’ve had that happen to the same black head on my knight eagle They put a glued on pad in there to keep the element tight. But they glue the pad right on the element wires after so many years it breaks downs somehow and the glue becomes conductive and the pad gets soft and looks like it is full of moisture or something or oil or liquidy took off the Pad cleaned it up. And. Bingo it works

Here's what's under the tape.

 

[CB590]

Have you tried it on another radio? Maybe let your tech know that it doesn't work and see what he says?

I actually did. He suggested removing the back plate at this point in case of short or whatever. I have to send another email.

 

[Handy Andy]

Why didn't he just use a couple of "mica insulator tabs" from old TO-220's? Gives you room and clearance plus the Mica works better than tape...

• Thread the wire thru the hole of the tab, then solder wire to the mic contact...
• then reposition the Tab, with the hole on the insulated portion of the wire
• - then press down so the MICA tab surface rests on the contact soldering point COVERING the contacts so they don't short to the back case.
• He may also need to realize these things do have a polarity - you may need to swap the wires to find the proper polarity to meet the amplifiers' needed polarity in the base...

SIGH...

 

[Shadetree Mechanic]

So did this thing work at all? Did it quit working or did it never work to begin with?

 

[Handy Andy]

There may be the problem with the Rochelle Crystal "Salt" - Nomad and Kopcicle did some artilces on this...

Start here...
https://www.worldwidedx.com/threads/d-104.241890/

https://www.worldwidedx.com/threads/robyn-t-240d-executive.233524/page-4#post-644080

Enjoy the trip thru History...Chemistry...And Physics....

 

[kaos513]

I don’t condone any mods to the element but I have seen the element casing being used as a casing for the new mic element.

 

[CB590]

@Shadetree Mechanic never had wired up before. Came with 8 pin plug.

@kaos513 I would have no issue with an element swap to either a new style one there selling for like $20 on EB or just one that works.

 

[Shadetree Mechanic]

The crystal elements can be damaged in shipping. Maybe that's what happened?

 

[CB590]

Tech just got back to me and said to ship it back for repair. Cost is only $11 to ship to him. I'll give him one more shot in a few days.