Jump to content
  • 0

Tuning a new base antenna



I just installed a new TRAM UHF base antenna 400-500 MHZ 5 db gain 200 watts Ham/GMRS on the house, connected to a Midland MXT400 on a battery power supply. The SWR reading is 3.2. I can monitor fine, however aparrently im not getting out, No one has responded to my calls for a radio check. Any advice on tuning?

Link to comment
Share on other sites

2 answers to this question

Recommended Posts

  • 0

People not answering calls for radio checks is a normal situation. It's not a Ham band, and even on Ham band good luck finding anybody on 446.000.


- Is it Tram 1450? What manual says about adjusting length of the radiators?

- Is your meter appropriate for the 460MHz? Do you use it correctly? Meters require calibration for SWR measurements. It's often easier and better to measure forward and reflected power. You want reflected power to be as low as possible.


To check the feedline integrity, attach dummy load instead of antenna, on the far end of the feedline, check SWR or reflected power at the radio, should be 1:1 or close to it. If you don' have dummy load, Move radiators to shortest and to longest positions, check SWR (or reflected power), see if there is any difference. If there is difference in measurements when moving radiators, chances your feedline is ok. Experiment with radiator length.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Guidelines.