HobbyPCB.com

Built by Hobbyist for Hobbyist!
It is currently Wed Aug 21, 2019 1:41 pm

All times are UTC - 5 hours




Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Mon Jul 23, 2012 12:19 pm 
Offline

Joined: Mon Jul 23, 2012 6:25 am
Posts: 1143
Welcome to the DSP-610 construction forum. Anyone actively building, thinking about building or troubleshooting a DSP-610 can post questions and I will do my best to answer them and help with any issues. We are going to stand up a wiki shortly as a repository for the various files and allow builders to add their own files, pictures and software.

The DSP-610 is a software defined radio so while you can just get the PIC and DSPIC already programmed or send them to me and I'll program them for you, as a builder it really makes sense to be able to work with the software yourself. Even if you don't have any experience with coding it won;t be too difficult to change filter coefficients, AGC thresholds, various delays, etc. So a recommend a PICKIT2 available at Newark for $35 if anyone knows of a cheaper programmer then please let us know.

As of today, I've finished the schematic for the new Power Amplifier PCB and I'm working on the layout. It should be ready in a few weeks and it should fit inside the case as designed. The redesign eliminated the COTO 2200-2302 reed relays, will help reduce the potential for internally generated spurs and provide 50W on 12/10M and 30W on 6M.

73's
Jim WA2EUJ


Top
 Profile  
 
PostPosted: Fri Aug 10, 2012 9:22 am 
Offline

Joined: Thu Aug 09, 2012 6:16 pm
Posts: 43
Hey Jim,

For reference, the pickit2 is $62.12 as of today on Newark: http://www.newark.com/microchip/pickit2promo/pickit2-programmer/dp/24M5827?Ntt=PICKIT2 This does not have a 40 pin socket. On eBay Sure Electronics have a PICKIT 3 with a 40P ZIF socket for about $39 delivered. I'm going to try it and report.

73
Bill


Top
 Profile  
 
PostPosted: Fri Aug 10, 2012 9:59 am 
Offline

Joined: Mon Jul 23, 2012 6:25 am
Posts: 1143
The Newark part number for the PICKIT 2 is 51M8937 and the price shown is $34.99 it doesn't have a socket that either processor can plug directly into but the PCB is designed with programming headers that the PICKIT2 and 3 plug directly into.

73's
Jim


Top
 Profile  
 
PostPosted: Thu Aug 16, 2012 11:23 pm 
Offline

Joined: Thu Aug 09, 2012 6:16 pm
Posts: 43
jimveatch wrote:
The redesign eliminated the COTO 2200-2302 reed relays, will help reduce the potential for internally generated spurs and provide 50W on 12/10M and 30W on 6M.

73's
Jim WA2EUJ


Thanks again for making this fine project Jim.

For anyone interested in building per original design, I have the COTO relays here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160865864483 at $4 each, which is figured at my cost for the remainder of lot which I picked up off eBay. Once eBay finishes with fees it is a loss. I have nine sets available.

I presume with the correct relays and added shielding you are confident these may work as designed and released per QST, correct?


Top
 Profile  
 
PostPosted: Fri Aug 17, 2012 5:52 am 
Offline

Joined: Mon Jul 23, 2012 6:25 am
Posts: 1143
Even with the correct relays, it is a challenge to get the DSP-610 working correctly with the 25W PA on the same PCB as the DSP and IF circuitry. Anyone attempting the single PCB build should have fairly advanced RF trouble shooting skills and a decent array of test equipment.

I strongly recommend the 2 PCB approach. In the next few week I'll be dismantling my DSP-610 and rebuilding it with the new PA board so if you decide to go down the single PCB path it should be possible to add the new PA board later.

For folks who are wondering about transformer winding. You can find similar transformers on the Hardrock-50 Wiki site here:

https://sites.google.com/site/hardrock5 ... ansformers

T1 on the Wiki is the same as T4 in the '610
T2 on the Wiki is the same as T3 in the '610 excpet the '610 uses only 3 turns in the secondary
T3 on the Wiki is the same as T2 in the '610

The Wiki site hase good pictures and detailed instructions. I'll be making a Wiki for the DSP-610 shortly.

73's
Jim WA2EUJ


Top
 Profile  
 
PostPosted: Fri Aug 17, 2012 1:24 pm 
Offline

Joined: Tue Aug 07, 2012 7:31 pm
Posts: 12
Hi Jim,
I just stummbled across this fourm. Is it possible to get a copy of the schematic for the PA board and BOM? Looking at the art work for the board I have a good idea of where you are heading. It looks like you are using different relay drivers, additional inductors, and obviously different relays. I'm just trying order parts and figure out where the RF_in will come from on the main board and how the LNA's will tie in. I've finished board except for the TX power chain, Will I need to add the first few stages on the main board (up to and including and I am just waiting the new board to finish it up.

I am using the optional encoder you recommended will this encoder require a code change?

Good job on the Hardrock 50 Wiki page. I think I'll build one of those next month. Alos looking forward to the DSP-6160 as a winter project if it is ready by then.

Cheers
Barry


Top
 Profile  
 
PostPosted: Sat Aug 18, 2012 3:37 pm 
Offline

Joined: Wed Nov 17, 2010 8:25 pm
Posts: 61
Barry,

You can find the schematic on the new product page:

http://www.hobbypcb.com/pic-development ... l?vmcchk=1

We'll work on getting the BOM posted up there too.

Curtis


Top
 Profile  
 
PostPosted: Sat Aug 18, 2012 4:38 pm 
Offline

Joined: Tue Aug 07, 2012 7:31 pm
Posts: 12
Thanks Curtis,

I just ordered the PA board and I'll see what else I'll have to order.

Cheers
Barry


Top
 Profile  
 
PostPosted: Sat Aug 18, 2012 8:41 pm 
Offline

Joined: Sat Aug 18, 2012 8:31 pm
Posts: 1
Jim,

Thanks for a great homebrew project. I think your project has shown that there is still a great interest in building ones own radio even in this day of modern, over featured over computerized radio world in which we live.

I'm posting on as I'd like some info on what you did on the front display board. Any photos or hints on how or what you mounted the LCD and buttons onto.

I have already ordered the main board and the PA Board and am warming up the ole solder iron.

73's.

Clay
KI4LDC


Top
 Profile  
 
PostPosted: Sat Aug 18, 2012 10:54 pm 
Offline

Joined: Mon Jul 23, 2012 6:25 am
Posts: 1143
The display and switches are mounted on a piece of perf board and wired up with wire-wrap wire for board to board cannections and #24 wire going over to the connector on the PCB. Once I get the beta build of the Hardrock-50's settled I'm going to dismantle my DSP-610 and add the new amp PCB. I'll take lots of pictures when I do.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group