www.shaneburrell.com BLOG Search – Rescue – Scuba – Diving – Telecom – Electronics – HAM Radio

14Jul/110

Kenwood TS-430S IF Board Repair

07/14/2011 - After removing the IF board from the TS-430 I could see some issues right off hand.  The top site of the board was realitivly clean although I noticed some excess thermal compound on the regulators which gave me a hint that this IF board had been repaired at some point.  Getting it out I could see lots of oxidation, burn traces at one of the regulators and at least one connect that had ripped the traces from the board.  Tonight I cleaned up much of the board tested all the diodes on the rear of the board, and repaired the 5V traces.   At this point the radio seems to work but I don't have very good recieve and it still only transmits on some bands.  On the bands it does transmit on it does full output which is a good sign.  I'll be working on the IF board for the next few days as its in bad shape on the rear side.

07/18/2011 - Well thus far, I have replaced the traces on the 5V regulator with jumpers as the eyelets were missing and that area of the board wasn't in very good shape.  I also located a burnt or gouged trace which will need repair.  A missing eyelet was found on Connector 10 and I ended up glueing the connector to the board and replacing the trace with a wire.  After looking at the board from the top I've noticed several missing caps.  I expect someone has tried to repair this board and during checking cold solder joints they may of pushed the caps off the board without noticing.

07/19/2011 The gouged trace has been repaired.  Now the IF section seems to be working at least a stage or two away from the audio section.  I ended up with a TX issue which was a bad connection at the molex connector which slowed progress on the IF board issues.

 

 

 

 

2May/1130

OSW 1.0D Kit TM-D710A keyboard adapter.

05/02/2011  07:12 AM - The order for the 1.0D board has been processed and passed design checks with manufacture.  We all should see boards from the group buy in the next 3-4 weeks hopefully.  Parts have already arrived.  I'll be posting more information and documentation during those long 3-4 weeks of waiting here.  I recommend to everyone to use an AVR platform for MCU development an interface but you are welcome to use what you want.  The goal is to end up with something that is under the 100ma current of the MIC interface. Read more...

2Nov/106

APRS TNC using Arduino with a display PCB Test

I've done a test layout to play with that I'll be testing in the next few days.  Below is the layout.

AVR TNC Arduino Shield Layout

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2Nov/100

APRS TNC using Arduino with a display.

Several folks have asked about using Arduinio hardware with APRS TNC.  I don't have a lot of motivation but figured I'd get the project started.  If you have an arduinio and would like to help develop this using arduino hardware please post (no emails please).  Here is the alpha schematic I'm working on using the display I started with in the original design.

Arduino TNC Shield

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21Oct/100

APRS AVR C vs Processing (Arduino)

I've gotten ton's of emails (100 or so) about the code for the APRS node I've been hacking away at.  I normally use an Arduino type board for prototyping.  However, the code is in C.  I do sometimes use processing to quick test something but generally things destined for the embedded world are in C.  Below are some projects I found related to what I am working on.  Some use the CML chips some don't. In the low cost model I don't use it.  I have been playing with a CML chip for digital type radios but they drive the cost up with what I am attempting to do which is build a device within the reach of just about any public safety department in volume.  And please if you don't mind, post questions as comments rather than emailing me directly.  That ensures that any Q&A can be seen by everyone.

http://garydion.com/projects/whereavr/   - This is a really nice setup, different application but very tidy setup.

http://sites.google.com/site/ki4mcw/Home/arduino-tnc - Hope to see more from this.  Its what more of you are looking for with PDE files provided.

9Aug/100

Wouxun KG-UVD1P WishList

I've used the radio quite a bit during the last day or so and I've already got a list of things the radio could do but doesn't.  Its a great radio and just a few of these features would make it top notch on usability and flexibility. Below is what I have so far. Feel free to comment!!!   ....

6Aug/101

Wouxun KG-UVD1P A great radio for the price.

Wouxun KG-UVD1P Package

Recently I purchased a Wouxun KG-UVD1P radio.  My main reason was that it was a inexpensive radio that was part 90 certified and had VHF UHF Dual band including HAM bands.  Construction is great and it appears to be just as rugged if not more so than my TK-3180 and TK-380.   ...

27Jul/100

AVR – CTCSS 2 Tone and APRS AX.25 project.

Brother Toner Transfer to PCB working!!!

AX.25 encode is complete and seems to work well.  AX.25 decode works, but I have a special mode and also have a CTCSS listen setup to remotely turn on that mode.  Still some items to do , but its almost time to put this on a board.  If you are interested in this project please let me know.  I was able to get my Brother Laser printer to work with the toner transfer method after some trial and error.  I had great results using a Brother HL-4070CDW and Kodak inkjet photo paper using a iron and being very patient with the soak.

25Jul/102

AVR CTCSS Tones and 2 Tone Paging.

I have several radios that don't have CTCSS or the ability to page out fire tones.  I figured I'd solve it with a programmable AVR.  I started with a basic Arduino board and progressed to c code to control various circuits for the generation and detection of tones.  I'll be posting some pics and information soon.

AVR Radio Controller TNC CTCSS PL TWO TONE