HobbyPCB.com

Built by Hobbyist for Hobbyist!
It is currently Thu Sep 19, 2019 9:50 am

All times are UTC - 5 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
PostPosted: Sun Mar 17, 2019 3:14 pm 
Offline

Joined: Tue Mar 05, 2019 9:13 pm
Posts: 2
Location: Bella Vista, AR
Hello,
I have completed assembly and testing of the HR50 all the way through the biasing step. Each mosfet was brought up 150ma sequentially (vr1 @150ma, vr2 @ 300ma, vr3 @ 450ma, vr4 @600ma) as measured with a Fluke 8060a DVOM. The logic comes up as it should and the key mode can be stepped through the changes successfully. Menu comes up fine and all settings are for no atu and no qsk as it has been built. When applying rf with the power off, rf goes through as it should 5 watts in, 5 watts out. When I power the HR50 with the key mode "off", power goes through as it should. When I select COR, I hear the low pass filter relays adjust to whatever band I have selected and I hear the T/R relay working as well. However, the output (meter between HR50 and dummy load) shows a decrease in driving power and there is no increase in output power taking place. The SWR indication is (-.-). I am using known good coaxial cables, power/swr meter, and dummy load. I have checked at rg-316 coaxial connections and solder joints are all good and in the proper connectors for my category of build. My only trouble shooting tools are the meters mentioned. Any suggestions?

Thanks and 73,
Fred
K5QBX


Top
 Profile  
 
PostPosted: Sun Mar 17, 2019 7:06 pm 
Offline

Joined: Mon Jul 23, 2012 6:25 am
Posts: 1143
Hi Fred,

We've been working on this off-forum but I wanted to post the resolution for future forum readers. The issue was determined to be T2. The enamel wire was in place and correctly soldered to the board but the end pieces of the transformer were not soldered to their pads on the board so the primary was unconnected.

Fortunately, you were able to send a photo so I could easily identify the problem.

73,
Jim WA2EUJ


Top
 Profile  
 
PostPosted: Sat Mar 23, 2019 3:14 pm 
Offline

Joined: Tue Mar 05, 2019 9:13 pm
Posts: 2
Location: Bella Vista, AR
Thanks again Jim...moral of story is not to work on building kits when you're tired or distracted...hihi.

Fred


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

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