[TowerTalk] 6M noise-canceling antenna product?

[Jim Lux]

At 02:11 PM 1/3/2006, Bill VanAlstyne W5WVO wrote:
>The MFJ-1025 and 1026 noise-canceling units don't work above 30 MHz. Does 
>anyone know of a similar noise-phasing product that will work on 6M? (I 
>suppose a lot of HF hams think "6M = VHF = quiet". Six is NOT a quiet 
>band, especially if you live in or near a city, or even a residential 
>neighborhood. Man-made QRN is horrendous on this band.)


The MFJ is basically an adjustable phase/amplitude shifter (with an active 
preamp).

Is the noise strong enough to cause IM problems in the mixer? (i.e. you've 
got Channel 2 blasting away)

If not, it might be worth considering some sort of scheme where you have a 
couple preamps (one on each antenna) and use an LC network to do the 
phasing.  Or, even, a 90 degree hybrid (rat race with coax?) and a couple 
pots to do the summing?

These days, too, you could probably find some nifty electronic multiplier 
chips that would work.  Most MDACs have bandwidths >100 MHz these days.



>Bill / W5WVO
>_______________________________________________
>
>
>
>_______________________________________________
>TowerTalk mailing list
>TowerTalk at contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk