Build CB 11metre 27MHz DDRR Quarter Wave Vertical Performance LOW Noise
Build a CB 11 metre 27 Mhz No Capacitor DDRR Antenna
Quarter Wave Vertical Performance but LOW Noise (DIY in 30 minutes)
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 CQDX11.com Design 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. IT HAS NO CAPACITOR so SIMPLE to BUILD!
Also as the main radiator is at ground potential the ambient noise level is way down compared to the Quarter wave whip!
The CQDX11 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!
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 CQDX11 DDRR going anywhere!
D – USE Copper/Aluminium Tube or Coax – Heliax or EVEN RG213 would work I think! (But lower band width, maybe five channels with low SWR)
SP – 12 ” high
L – 108″ long Copper Tube or Coax cable
G – 8″ – 9″ gap from upright to radiator end. NO CAPACITOR!
FP – 8 – 9″ tap from upright along radiator. TO BE TESTED for LOWEST SWR on center of most used channels!
It looks 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
MMM Motor Mouth Maul uses one similar on top of his vehicle and pumps many thousands of watts on AM into it for fun I believe!
ALSO would be good for Caravans and Motor Homes – Some Facebook chat:-