RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Amateur Radio > Amateur Radio Antennas


Amateur Radio Antennas - For discussion of all amateur band designed antennas and related accoutrements. This includes base, handheld, mobile and repeater usage. For commercial antennas on the amateur bands please use Commercial Radio Antennas below.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 06-01-2017, 5:00 AM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Oct 2002
Location: Farmington, Connecticut
Posts: 98
Default Mobile dual band fold-over antennas

Wondering about my fold-over dual band mobile Diamond NR770HB antennas. I had two of them set up with my Icom IC2820 DStar radio and one went bad. Now the other one bit the dust. Or did they? They are fold-over antennas, a feature I never used, instead I installed two motorized mounts-didn't feel like getting out of my pickup every time I went into my garage. My question is was my thinking they went bad premature? Did the fact I never exercised the fold-over feature cause them to become corroded? I threw them out before I could test this theory. What experience have you had with this Diamond antenna? Have they been known to be prone to early failure?

Bill
__________________
Bill
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 06-01-2017, 7:55 AM
W9BU's Avatar
Lead Wiki Manager
  RadioReference Database Admininstrator
Database Admin
Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2004
Location: Brownsburg, Indiana
Posts: 4,685
Default

Yes, the fold over feature is prone to failure. There's a spring inside the housing just below the fold over mechanism. The mechanism is not water tight, so water seeps in, corrosion forms, and, in some cases, the spring breaks. When that happens, the fold over mechanism is no longer held together in the upright state.
__________________
Lead Wiki Manager and Forum Moderator.

"The whole world's living in a digital dream. It's not really there, it's all on the screen." -- WB6ACU
Reply With Quote
  #3 (permalink)  
Old 06-01-2017, 8:39 AM
KK4JUG's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2014
Location: Columbus, GA
Posts: 866
Default

Fold-over antennae can also fold over unexpectedly. I have a Comet SSB-14 quad-band fold-over antenna. It has a spring-loaded mechanism (lift up, fold down). A recent 2000 mile trip on mostly high-speed, limited-access roads resulted in the antenna folding over on its own twice.

To keep this from continuing, I wrapped a small piece of duct tape at the "breaking" point. It worked fine but it's not practical to have to remove the tape to fold the antenna over. I'll be replacing the antenna.
Reply With Quote
  #4 (permalink)  
Old 06-01-2017, 8:42 AM
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2002
Location: Pasadena, Maryland
Posts: 134
Default

I've had three of these for years and had one fail as described. The spring broke. I bore a hole and inserted a small stainless screw and all has been good since. Just can't fold that one over.
Reply With Quote
  #5 (permalink)  
Old 06-01-2017, 9:22 AM
KK4JUG's Avatar
Member
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Dec 2014
Location: Columbus, GA
Posts: 866
Default

Quote:
Originally Posted by KR3LC View Post
I've had three of these for years and had one fail as described. The spring broke. I bore a hole and inserted a small stainless screw and all has been good since. Just can't fold that one over.
I will still occasionally need to fold mine so I'll stick to the tape idea until I replace it. Otherwise, I would definitely screw it down.

Also, if I could find someone who might want the antenna, I'd rather have the fold-over feature still intact and they could do with it as they wish.
Reply With Quote
Sponsored links
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 7:15 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions