1 / 17

Shunt Fed Tower

Shunt Fed Tower. Or If You Have a 50- to 60-Foot Tower with Something on Top, Here’s One Way You Can Get on 160M. My Situation. City Lot Tribander for 10, 15, and 20M Full-wave Delta Loop for 40M What to do for 160M?. Use Existing Tower.

kevin-mclaughlin
Download Presentation

Shunt Fed Tower

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Shunt Fed Tower OrIf You Have a 50- to 60-Foot Tower with Something on Top, Here’s One WayYou Can Get on 160M

  2. My Situation City Lot Tribander for 10, 15, and 20M Full-wave Delta Loop for 40M What to do for 160M?

  3. Use Existing Tower http://www.qsl.net/w9rb/webdoc9.htm

  4. Why a Vertical? Low take-off angle for DX Not a “space-saving” antenna Needs radials – the more the better Real World - 16 radials MINIMUM Ten 10-foot radials better than one 100-foot

  5. Construction Two wires 18 inches apart – fat conductor Inside wire 3 feet from tower Gamma section as long as possible Weather-proof plastic box at base

  6. Model EZNEC+ Version 5.0 f=1.825 MHz Z=27.59 + j556

  7. EZNEC+ ver. 5.0 160M Shunt Fed 60Ft Tower --------------- SOURCE DATA --------------- Frequency = 1.825 MHz Source 1 Voltage = 556.7 V at 87.16 deg. Current = 1 A at 0.0 deg. Impedance = 27.59 + J 556 ohms Power = 27.59 watts SWR (50 ohm system) > 100

  8. 160M Shunt Fed 60-Foot Tower

  9. Measured Autek Research RX VECTOR ANALYST Model VA1 f=1.825 MHz Z=440 + j300

  10. Matching Network http://www.circuitsage.com/matching/matcher2.html L = 15 uH C = 558 pF

  11. Matching Network Source --------- L = 15 uH ----------- Load | C = 558 pF | Gnd

  12. On The Air Works okay for transmit Not so great for receive

  13. Possible Problem Rotor in tower – controller may not be happy Solution disconnect rotator control cable before transmitting

More Related