• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
Part15

Part15

License Free, legal, low-power radio broadcasting

  • Home
  • The ALPB
  • Forums
  • Members
  • About Us
  • Contact Us
  • Log In

AMT5000 Antenna Information

Home › Forums › temp › Isotron with SSTRAN AMT5000 › AMT5000 Antenna Information

December 16, 2012 at 6:04 am #29807
PhilB
Guest

Total posts : 45366

..the hypothesis I made months ago, that the 5K unit is going to have a wee bit of a problem reaching it’s sweet spot when connected up to anything else other than the simple wire..

As I said in a previous post, the AMT5000 was designed and verified to cover the frequency range of 1350 kHz to 1700 kHz for all antennas with capacitance in the range of 19pF to 37pF.

Per FCC rules, the absolute maximum height is 3 meters (118 in.).

#22 wire (118 in. length supplied with kit)
minimum length=108 in., C=19pF
maximum length=226 in., C=37pF

102″ CB whip, OD=.2 in.
length=102 in., C=24.46pF

1/2″ Copper Pipe OD=.625 in.
minimum length=56 in., C=19pF
maximum length=132 in., C=37pF

3/4″ Copper Pipe OD=.875 in.
minimum length=50 in., C=19pF
maximum length=120 in., C=37pF

Antennas with less than 19pF capacitance will shift the tuning range upward. Antennas with more than 37pF capacitance will shift the tuning range downward.

The tuning range of 1350 kHz to 1700 kHz was chosen because of better antenna efficiency at the high end of the band.

The capacitance range was chosen to include the most common Part 15 antenna element types.

Widening the tuning range and capacitance range significantly would necessitate a toroid with many more taps and/or a larger trimmer capacitor, both of which would reduce tuning network efficiency.

Primary Sidebar

Who’s Online

There are no users currently online

Footer

Members

Newest | Active | Popular
  • Profile picture of ArtisanRadio
    ArtisanRadio
    Active 10 hours, 37 minutes ago
  • Profile picture of Mark
    Mark
    Active 13 hours, 5 minutes ago
  • Profile picture of rock95seven
    rock95seven
    Active 1 day, 3 hours ago
  • Profile picture of Matthew Wells
    Matthew Wells
    Active 3 days ago
  • Profile picture of timinbovey
    timinbovey
    Active 3 days, 23 hours ago

Copyright © 2022 · Part15 on Genesis Framework · WordPress · Log in