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Re: TX 500 Filter orientation

Per the documentation I can answer my questions. Ignore the dot on the filter or silkscreen. The dot on the filter goes to the left Yes... I installed my current sense transformers correctly. That's what I get for dragging this build out for months. Couldn't help it. I work to pay the bills and buy ...
by NE5U
21 Nov 2017 23:26
 
Forum: Juma Discussion
Topic: TX 500 Filter orientation
Replies: 2
Views: 232

Re: IRFI540N install orientation and lack of availability

I found all of the documents so I can answer the orientation question. As you would expect, the MOSFET is attached to the back panel.
by NE5U
21 Nov 2017 23:23
 
Forum: Juma Discussion
Topic: IRFI540N install orientation and lack of availability
Replies: 1
Views: 186

IRFI540N install orientation and lack of availability

Q6 and Q7 are somewhat unobtanium. I found some allegedly NOS for sale on eBay but that's always a crap shoot. That said, the crooked logo on the supplied transistors makes them suspect as well. The scarcity of these parts does not bode well for future repairs. Is there a substitute? The silkscreen ...
by NE5U
21 Nov 2017 22:50
 
Forum: Juma Discussion
Topic: IRFI540N install orientation and lack of availability
Replies: 1
Views: 186

Re: TX500 Control board hardware?

Not much activity on this forum :/
by NE5U
21 Nov 2017 21:32
 
Forum: Juma Discussion
Topic: TX500 Control board hardware?
Replies: 1
Views: 284

Re: FS: TRX-1, TX-1 & RX-1 Kits unbuilt complete

I am sure you have sold these by now but stranger things have happened. Do you still have the kits and if so what would be your lowest asking price? I am attempting to teach my son kit building and I think it is time for him to try it on his own radio. WJ5G Callen QRZ says "Callsign Surrendere...
by NE5U
21 Nov 2017 21:31
 
Forum: Juma Discussion
Topic: FS: TRX-1, TX-1 & RX-1 Kits unbuilt complete
Replies: 2
Views: 1366

TX 500 Filter orientation

I'm a little confused by the dot on the silkscreen and the dot on T1/T2. They don't match and there's no orientation where they do match (that I can see). I haven't installed anything. I just put the part on the board for reference. The filter has a dot on the left pad and the silkscreen has the dot...
by NE5U
21 Nov 2017 21:23
 
Forum: Juma Discussion
Topic: TX 500 Filter orientation
Replies: 2
Views: 232

Re: JUMA CMCD Xmitter Main Board components?

The second pic showed up. Awesome I literally just picked up the chip and sighted down the edge, sure enough, one of the long sides is chamfered. I couldn't see the chamfer when looking down on it with my 2x visor and I was ready to disagree. :D Normally I would be working with a microscope but I'm ...
by NE5U
07 Nov 2017 13:24
 
Forum: Juma Discussion
Topic: JUMA CMCD Xmitter Main Board components?
Replies: 3
Views: 291

Re: JUMA CMCD Xmitter Main Board components?

IC10 dos not have a Pin 1 designator so I'm not sure how to orient it. WTH? Why can't I post a link to a second image?

Image
by NE5U
07 Nov 2017 00:51
 
Forum: Juma Discussion
Topic: JUMA CMCD Xmitter Main Board components?
Replies: 3
Views: 291

JUMA CMCD Xmitter Main Board components?

There are two components on the main board that I'm having trouble with. D8- the parts list that came in the bag says it is a SM6T18A however I don't see that number on the part. I soldered it in place because there was really no other place for it. http://wildlightimagingstudio.com/img/s10/v105/p26...
by NE5U
07 Nov 2017 00:46
 
Forum: Juma Discussion
Topic: JUMA CMCD Xmitter Main Board components?
Replies: 3
Views: 291

TX500 Control board hardware?

I'm at the point where I need to mount the LCD and faceplate for the controller board. None of the hardware sizes makes sense. The small diameter screws are way too long (12mm) and stick out of the bottom of the board. The studs on the standoffs are way too long (8mm) and stick out of the board too ...
by NE5U
20 Sep 2017 18:15
 
Forum: Juma Discussion
Topic: TX500 Control board hardware?
Replies: 1
Views: 284
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