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TRX1 It's Alive

The TRX1 is finished and fired up first time. I heard signals, even while using a small miracle antenna. I didn't think this was going to happen since I had to jury-rig the DDS board after my soldering mishap with the AD9833. I am now an advocate of using a hotplate to install these extra small part...
by WB2MSC
13 Dec 2012 12:46
 
Forum: Juma Discussion
Topic: TRX1 It's Alive
Replies: 0
Views: 1558

Re: TRX1 DDS Board

Well, I got a breakout board for the DDS AD9833. This time I baked the AD9833 on with a hotplate and some solder paste. It worked like a charm. There were a few small solder bridges, easily taken care of with a bit of flux and unsoldering braid. I then wired the small board to the DDS board using so...
by WB2MSC
09 Dec 2012 00:42
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 DDS Board

Well, I tried another AD9833 and failed again. My last attempt - I got one of those MSOP to DIP adapters and will wire it to various places on the DDS board according to the schematic. It will be necessary to try the rework station for the first time as I will never be able to solder that IC to the ...
by WB2MSC
30 Nov 2012 09:37
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 DDS Board

Bob forget the last post...those pads are for wiring...duh! Marc
by WB2MSC
29 Nov 2012 01:06
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 DDS Board

Hey Bob I looked up the MPLAB ICD3 online. Not bad.... it is about 189.00 at the usual parts emporiums. The TRX1 DDS board is different from the TRX2A. On the TRX1 board I see a line of 6 pads that just have a little solder on them. Am I correct in assuming that this is for the programming interface...
by WB2MSC
28 Nov 2012 18:56
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 DDS Board

Bob and others

I browsed around on the Web for information on programming the AS9833. I am confused (my normal state).

What do I need to program this IC? I already downloaded the C program from the TRX1 page. What programmer do I need?

Thanks

Marc WB2MSC
by WB2MSC
28 Nov 2012 16:28
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 DDS Board

Thanks again, Bob I had no trouble with the 3 pinners. Just so long as there is room for the iron, I'm alright (if I dig my elbows into my side and rest the palms on the table). I do what you do for the larger chips, exactly. But, that little monster DDS. I ordered a long conical 1/64 tip. It was th...
by WB2MSC
28 Nov 2012 12:09
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 DDS Board

Hey Bob It's great to meet you. I did what you suggested some time ago on another project with more substantial traces and pads. The pads for this part are so small. But, I think I will take your advice and try it here. I suppose I can also go from the nearest component as well. I have a digital Wel...
by WB2MSC
24 Nov 2012 20:59
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

TRX1 DDS Board

Matti and others, Well, I was defeated by that small DDS IC1 chip. I tried to solder it but it was so tiny that I got solder bridges and finally lifted a pad or two. I couldn't get my iron onto any one pad. How do the experts handle this? I assume the board is useless and will have to order a new on...
by WB2MSC
23 Nov 2012 17:45
 
Forum: Juma Discussion
Topic: TRX1 DDS Board
Replies: 10
Views: 7380

Re: TRX1 PA Board

Hi Matti Both the analog and digital meters zero out. I have been using the digital meter to check the parts as I solder them. All values are in a resonable tolerance from the part marking. Since all 3 trims measure the same, I doubt the parts are bad but, perhaps, poorly soldered. Should I order ne...
by WB2MSC
23 Nov 2012 12:41
 
Forum: Juma Discussion
Topic: TRX1 PA Board
Replies: 10
Views: 6880
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