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K9AY++ RX Antenna CLASSIC

This is small four directional RX antenna for lower HF bands. Ideal for portable use as well as for home installation. Antenna has got Band Pass Filters and Preamplifier in the feed point of the loops. It is advantage of filtering and amplification small signals directly from antenna. Controller is able to control also Bi-directional 4-way system.

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Description

The K9AY is terminated loop RX antenna. It consists of a wire loop of any convenient shape (diamond, delta, etc), hung from a single support and with a ground rod at the bottom. A 9:1 impedance-matching transformer is connected from one end of the loop to the ground and a terminating resistor is connected the other end of the loop to the ground. This antenna is directional. Favoring signals are arriving from the feed point end. You can also change the antenna far field by changing RLOAD (RTERM) of the loop. This set including the RF feeder box and the controller. Antenna has got Band Pass Filters and Preamplifier in the feed point of the loops. It is advantage of filtering and amplification small signals directly from antenna.


Main functions

  • Low noise RX antenna
  • Broadband
  • 4 directions
  • Needs small room
  • Great for portable operations
  • 50/75 Ohm feed line tolerant
  • PREAMP with variable gain 0 to 18 dB
  • Three switchable BPFs or BYPASS
  • RX protections/limiters in feeder and controller
  • Common-mode filter in feeder
  • RX source switch for TX and RX antenna

RF feeder box

  • ONE versions for:
  • Common-mode coax choke included
  • PREAMP with variable gain 0 to 18 dB
  • Three switchable BPFs or BYPASS
  • Front-end RF limiters
  • High voltage electrostatic protection with neon lamps
  • High power IN/OUT protection
  • Safe to use it close to TX antenna
  • Easy to use LAN RJ-45 UTP CAT-6 cable
  • F/B depends also on loop installation
  • Stainless screws and nuts
  • High quality connectors
  • IP56 box - recommended to protect it against water
  • Feeder size 200x150 mm
  • ASSEMBLED VERSION

Controller

  • Universal box for K9AY or 4-way Bi-Dir beverage system - there are BPFs and Preamp only in K9AY++ feeder, not for beverages!
  • If you want to use K9AY and 4-way beverage system with BPFs and Preamp, this is better solution K9AY/4-way controller + simply K9AY
  • Including Bias Tee AC/DC
  • HPF > 50 kHz as AC noise eliminator
  • Front End protections
  • RF power limiters in RX line
  • LED direction indicator 0 or 45 deg.image
  • Rload variable by potentiometer on the front panel
  • Three BPFs and Bypass - 4 positions switch on the front panel
  • Preamplifier switch and LED indicator
  • RX SOURCE switch. Selecting TX or RX antenna for receiving. More info: image and manual

Parameters

  • Supply voltage DC (AC for 4-way beverage system) 12 - 14 V up to 2 A
  • Preamplifier with 1 W NPN transistor 2SC5551A
  • Preamp BIAS current 10 to 70 mA
  • Gain: up to 18 dB - preset to 10 dB
  • Noise Figure (NF) < 2 dB
  • REAL OIP3 34 dBm
  • Input HPF > 50 kHz (AC limiter)
  • BPF insertion loss lower than 1 dB
  • Bias Tee AC/DC max. 350 mA (for 4-way beverage system)
  • HPF > 100 kHz as AC noise eliminator (80 dB at 20 kHz)
  • TX power from TRX to TX antenna port up to 400 W
  • PTT IN/OUT - only loop, no delay, TX to GND
  • PTT logic is 5 V compatible (OM-power)

Available as

ASSEMBLED: classic version - ready to use
ASSEMBLED: remote version - ready to use - REMOTE VERSION

K9AY++ system includes: RECOMMENDATIONS TO BUY:

Manual

If you want to know more please check our wiki with K9AY++ RX antenna manual & K9AY/4-way antenna switch controller manual.



RF feeder box

k9ay++ feeder box by qro.cz hamparts.shop



RF feeder box inside

k9ay++ feeder inside by qro.cz hamparts.shop



RF feeder box inside diagram

k9ay++ feeder inside by qro.cz hamparts.shop



controller

k9ay++ controller by qro.cz hamparts.shop



k9ay++ controller classic version by qro.cz hamparts.shop



k9ay++ controller classic version by qro.cz hamparts.shop



K9AY++ controller block diagram

k9ay controller classic version block diagram by qro.cz hamparts.shop



holder and accessories

k9ay++ classic version holder and accessories by qro.cz hamparts.shop



Band Pass Filters characteristic with preamplifier

160m BPF with preamp

k9ay++ system measurement qro.cz hamparts.shop



80m BPF with preamp

k9ay++ system measurement qro.cz hamparts.shop



40m BPF with preamp

k9ay++ antenna system measurement qro.cz hamparts.shop



BYPASS with preamp

k9ay++ rx antenna system measurement poty adapter qro.cz hamparts.shop



Option: Common-mode current choke for coax and control cable

  • Coax cable current isolator
  • Common-mode current isolator also for control cable
  • You can use part of FTP CAT-5 cable from antenna to this optional box as GND system
  • Recommended to place it into the hamshack too

k9ay++ rx antenna with common-mode current choke by qro.cz hamparts.shop



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Product Details

Data sheet

type
ASSEMBLED
design
in enclosure
controller
with controller
Attachments
40m
MMANA file for 40m
Download (561B)
80m
MMANA file for 80m
Download (567B)
160m
MMANA file for 160m
Download (564B)
80m & 160m
MMANA file for 80m and 160m by OK2ZAW
Download (527B)
k9ay how to build
pdf file about how to build the K9AY loop receiving antenna by Gary Breed, K9AY
Download (56.69KB)
Reviews(1)
Overall rating
0
1 Review
I've been using K9AY++ several weeks now in mediumwave (broadcasting) dxing and my impressions have been only positive. It is always amazing to change the audible stations on the channel by adjusting the direction and resistor knobs. Lots of mediumwave stations from the Far East received so far and this evening at 1700 UTC I received even Australian ABC Adelaide 891 kHz under pressure of Asian stations on the channel. I could never have expected to receive Australian MW-station with K9AY! K9AY++ really rocks!

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manuals

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