Build a CB 11 metre 27 Mhz DDRR Antenna

Quarter Wave Vertical Performance but LOW Noise

Below is a shot of the original Mag wheel I had my 9 foot Whip on which is clamped to the iron roof and quarter wave whip now removed and the RG58 Coax  fly lead PL259 is reconnected into the new DDRR antenna. The DDRR is just an old piece of copper cable 20cm dia. bent in a wobbly circle.

This is the perfect STEALTH and Flat Iron Roof Antenna which has Low angle Mainly Vertical but some Horizontal Polarisation to help with DX contacts

Also as the main radiator is at ground potential the ambient noise level is way down compared to the Quarter wave whip!

The DDRR CB Radio Antenna is now booming across Australia on skip and proving to be much quieter receiving less noise than the 1/4 Wave 9′ Whip!

Dual-DDRR

I have also added some holes in the top of the upright insulators to thread a cable tie through to anchor the radiator to them although it is so heavy being solid copper strands that it did not move much in the wind. We just last night had 100 klm hr winds across the roof and I have no worries about the DDRR going anywhere!

11Meter-DDRR-Antenna-1.1:2 SWR @ 56 Ohms impedance on 27.305 MHz

D –  USE Copper Cable – Heliax or EVEN RG213 would work I think!

SP – 12 ” high 

L – 108″ long Copper cable

G – 8″ gap from upright to radiator end. NO CAPACITOR!

FP – 8 – 9″ tap from upright along radiator. TO BE TESTED!

Its like a joke but it WORKS like a 9′ S/S Quarter Wave

Whip BUT with LOW NOISE!!

Low angle Mainly Verticle but some Horizontal Polarisation

Perfect STEALTH and Flat Iron Roof Antenna

 

http://alphaxray.info/wp-content/uploads/11Meter-DDRR-Antenna.gifhttp://alphaxray.info/wp-content/uploads/11Meter-DDRR-Antenna-250x165.gifAX005AX Members BlogAX05CB Radio InformationBuild a CB 11 metre 27 Mhz DDRR Antenna Quarter Wave Vertical Performance but LOW Noise Below is a shot of the original Mag wheel I had my 9 foot Whip on which is clamped to the iron roof and quarter wave whip now removed and the RG58 Coax  fly lead...AX Alpha Xray International Syndicate on CB Radio Channel #3 LSB + #3A