eHam Logo

 Home Home
 Articles & Stories
 Contesting Wiki
 My Profile

 This Week's Contests
 Classified Ads
 Contest Links
 Product Reviews

Contest Lists

Other Lists

 Mailing List FAQs

Site Information
 About This Site Team

Contesting Online Forums : Tips : Filters or Stubs ? Forums Help

1-2 of 2 messages

  Page 1 of 1  

Filters or Stubs ? Reply
by MM0BQI on April 21, 2002 Mail this to a friend!
I have just set up my SO2R station using an MP and IC-746. The IC suffers QRM from the MP making receiving very difficult. As this is a simple setup I think I would klike to instal tuned stubs to cut down the interference but would welcome your comments and experiences
RE: Filters or Stubs ? Reply
by oe5oho on April 22, 2002 Mail this to a friend!
Try stubs first and see if it works for you. You can tune your stubs with most antenna analyzers (download MFJ or AEA manuals for the tuning procedure) with satisfactory results. Use a simple T-connector just behind the PA and the same cable as you use it for feeding your antenna. If it doesn´t help YOUR situation try to borrow a TRX-filter and see if it helps together with your stubs (you might want to check if it works without the stubs too). Either build it yourself or buy one if it does the job for you. One solution is also to just have a RX-filter like the Bavarian Contest Club preselector (see Remember that for a RX only filter you need to have a TRX which is providing the RX-path at the rearpanel - or you need to do a small modification to your TRX. As in all cases BEFORE you go into the trouble of building stubs or testing filters - TX on rigA at full output (turn the beams at worst case scenario towards onto each other), instead of the rigB on the 2nd antenna connect a SWR-powermeter and a 50ohm dummyload to measure the powerlevel which is present on the 2nd antenna while TXing on the 1st antenna with rigA. Then you know if it is worth going for some RX-protection or not. VY 55 de Oliver OE5OHO.

  Page 1 of 1  

Next Topic:   3830
Previous Topic:   WPX Scoring
Email Subscription
You are not subscribed to this topic.

My Subscriptions
Subscriptions Help

Search Tips:

Check our help page for help using Forums, or send questions, comments, or suggestions to the Forums Manager.