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Hendricks Deluxe Tenna Dipper Kit

Designed by Steve Weber, KD1JV




The Deluxe Tenna Dipper provides a simple means of determining the 50 ohm resonant frequency of an HF antenna or ATU (Antenna Tuning Unit). The small size and battery operation makes the unit ideal for use in the field. It's perfect for antenna experimenters that don't want to tie a bunch of money up in the higher priced analyzers. It's even priced lower than most swr bridges, and this tells you "where" you are resonant, not just that it's matched, or not matched, like a simple swr bridge.

Features:


  • Wide tuning range: ~3 MHz to ~30 MHz in two ranges
  • Four digit digital display with display shift down to 100Hz
  • Eliminates the need for a transmitter and SWR bridge when:
  • Trimming length of resonate dipole, and portable vertical antennas
  • QRM free adjusting of antenna tuners and antennas
  • Quickly adjust short, portable vertical antennas, eg. PAC-12 & Screwdriver antennas, etc.
  • Current draw is approximately 50mA
  • Weight w/batteries: .66 lbs./10.6 oz./ 300g


How it Works:


A voltage controlled R/C oscillator generates a 5 volt square wave signal. This signal drives a resistive Wheatstone bridge. One leg of the bridge is the "unknown" resistance, the antenna. A wide band step up transformer is connected across the bridge to detect the signal produced when the bridge is unbalanced. This signal is farther amplified by a Darlington pair transistor amplifier. A high brightness LED is used to visually indicate the current in the collector of the amplifier. When the antenna impedance at the unknown leg of the bridge is equal to 50 ohms, the bridge is in balance and the LED will go out. Hence the name for this device, the Tenna Dipper, as we dip the brightness of the LED to find the 50 ohm match.

Supporting Files and Documents


Deluxe Tenna Dipper Assembly Manual (4/24 update) 

Deluxe Tenna Dipper Decal Install) 



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Ordering Information

You may use our Order page to order the Deluxe Tenna Dipper by mail using check or money order. or

Ordering electronically by PayPal using the buttons below.

NOTE
When an order is placed through PayPal, shipping charges are automatically calculated then a confirmation email is immediately sent by PayPal. For more information about our shipping charges please take a look at our Order Form page. We also receive this same email, so please rest assured that we have logged your order into our books. No other order confirmation will be issued. Your kit will be shipped in 1-2 weeks after our receiving the order, unless otherwise stated. Thanks for your support.

Orders of multiple kits that I can ship in the same box will have shipping costs adjusted and the excess will be refunded.
 

Deluxe Tenna Dipper: $90.00
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Please use our Order page to order by mail.


Page last updated: 08/15/2014, 15:34:34
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