HobbyPCB.com

Built by Hobbyist for Hobbyist!
It is currently Sun Aug 18, 2019 11:00 pm

All times are UTC - 5 hours




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: Low gain on 20 and 10
PostPosted: Fri Nov 14, 2014 6:09 am 
Offline

Joined: Tue Oct 14, 2014 9:45 am
Posts: 7
Hi
Just finished amp and I have two issues
- low gain on 20m, 17m is OK , don't understand why the LPF passband changes when switching from 20 to 17 I would have thought it should stay the same
- low gain on 10m caused by an apparent resonance at 29.3MHz. The shape of the passband does not change going from 15-12-10 which is what I would expect

All other bands are OK .
Any ideas before I dismantle the RF board off the heatsink and measure the LPFs directly

73 and thanks

Bob G3PJT


Top
 Profile  
 
PostPosted: Fri Nov 14, 2014 6:55 am 
Offline

Joined: Tue Oct 14, 2014 9:45 am
Posts: 7
sorry put this in the wrong forum - moved it to Hardrock 50


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 3 guests


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