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Feed Point Preamp BOX

Unique product that combines universal transformer, preamplifier, simply Low Pass Filter, Bias Tee, front-end protection and common-mode output filter.

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131.89 € (tax incl.)
131.89 €
109.00 € (without tax)
connector
  • PL
version
  • with terminator
  • only preamp
in stock, shipped in 2-3 days

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The lowest price in the 30 last days was 131.89 €

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Description

This is unique product for RX antennas. It combines universal transformer, preamplifier, simply Low Pass Filter, Bias Tee, front-end protection and common-mode output filter. The transformer allows you to set three ratios: 1:4, 1:9, 1:16. This alows the Feed Point Preamp to be connected to most RX antennas: Beverage (classic or BOG), RX loops like K9AY, DHDL, flag etc. The input is isolated from the coax ground.

There are many RX antennas (RX loop, K9AY, Flag, etc.) that have negative gain. Inserting a coaxial cable between the antenna and the amplifier can induce unwanted signals and further attenuate desirable ones - in addition to common-mode current problems. Therefore, in this device the signal is amplified immediately at the feed point of the antenna.

There is also the possibility to include a Low Pass Filter with a limitation below 11 MHz, between the transformer and the preamplifier, besides the RF limiter. Thanks to this filter, the preamplifier will not be bothered by nearby signals from the transmitter in the bands 20m and above.

The preamplifier has a maximum gain of about 18 dB. Behind it is a variable ATT, which allows you to control the overall gain as needed.

The preamplifier can be powered via coaxial cable (internal Bias Tee) using an external Bias Tee in hamshack or via a cable connected directly to the box via a gland.

There is common-mode choke at the output of the box. This provides additional isolation between the antenna and the coaxial output.

The Feed Point Preamp is sold in two variants: the preamp box alone (only preamp version) and then in a version with a universal terminator.

Universal Terminator is a small box designed to terminate RX antennas like beverages, K9AY and other loops. This terminator allows you to change the value in three ranges: typ. 900, 450, 230 and 320 Ohms with the possibility of adding +50 Ohms to each value. The terminator is designed for a continuous RF load of approximately 3 W. It includes current (power) overload protection as well as voltage protection using GD and Neon lamps at approximately 80V AC.


Using

  • Universal matching transfomer
  • High IP RX preamplifier
  • Active feed point or Beverages, RX loops and RX verticals
  • Universal terminator (version with terminator)

Main functions

  • Broadband: 0.1 MHz to 30 MHz
  • Transformer with ratio: 1:4, 1:9, 1:16
  • Input impedance around: 200, 450, 800 Ohm
  • Input current/voltage protections
  • Input WB or LPF (11 MHz) cut-off filter
  • Very high IP3 Preamplifier
  • Gain up to 18 dB
  • Variable ATT for gain 0 to 18 dB
  • Front-end diode protection - ON/OFF by jumpers
  • Power over coax with the internal Bias Tee
  • OR external cable with DC voltage
  • Output common-mode choke for coax
  • Coax impedance 50 or 75 Ohm
  • High quality connector and stainless steel screws
  • IP56 box - recommended to protect it against water
  • Feeder size 100x100 mm
  • ASSEMBLED AND TESTED VERSION

Parameters

  • Input impedance 200 to 900 Ohm
  • Frequency range 0.1 to 30 MHz, with LPF up to 11 MHz
  • Low Pass Filter 11 MHz (or wideband)
  • Input RF limiter (typ. 20 dBm)
  • Preamplifier gain typ. 18 dB
  • Input P1d typ. + 4 dBm
  • Variable Attenuator
  • Supply voltage 12 - 15 V
  • Power directly or bias tee - voltage 12 - 15 V
  • Supply current up to 100 mA
  • Output RF limiter
  • Output common-mode choke


VERSION WITH UNIVERSAL TERMINATOR

    • Universal terminator with 900, 450, 230 and 320 Ohm
    • Possible to add +50 Ohm
    • Terminator load up to 3 W
    • Current and voltage protections
    • Terminator max. continue RF power 3 W
    • IP56 box - recommended to protect it against water
    • Terminator size 64x58 mm
    • ASSEMBLED AND TESTED VERSION

Available as

ASSEMBLED: only preamp version - ready to use
ASSEMBLED: with terminator version - ready to use


Included in package

Preamp assembled and tested
Terminator assembled and tested (version with terminator)


Manual

If you want to know more please check our wiki with Feed Point Preamp Box manual.





feeder box

rx feed point preamplifier box with PL SO-239 connector qro.cz hamparts.shop



universal terminator

rx feed point preamp universal terminator qro.cz hamparts.shop



Examples of connection to different RX antennas - more in manual

rx feed point preamp universal terminator example rx antenna design construction qro.cz hamparts.shop



rx feed point preamplifier by qro.cz hamparts.shop



rx feed point preamplifier with bias tee by qro.cz hamparts.shop



rx feed point feeder box block diagram by qro.cz hamparts.shop



recommendations to buy rx audite sdr splitter switch by qro.cz hamparts.shop



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Product Details

Data sheet

type
ASSEMBLED
design
in enclosure
usage
RX
impedance
both 50 & 75 Ohm
front-end protection
input and output
frequency range
0.1 MHz to 30 MHz
product dimensions
65x58x35 mm - PU box IP56
100x100x50 mm - PU box IP56
product weight (brutto)
0.33 and 0.4 kg
package dimensions
18.5x14x10.5 cm

Specific References

ean13
1000090112729
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