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Call Sign : 2-CT-351 Posts : 5 Times Thanked : 0 Join date : 2020-07-09 QTH or Location : Greeley / Evans Equipment Used : Kenwood TS450s TS440s Icom 706MK2 Sigma Venom 5/8 wave with home brew ground radials (8) Drake R 4B- T 4xB (twins) 4el LFA soon to go up in the air/
Subject: Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Wed Oct 13, 2021 1:34 am
I ordered one of these Sigma Venom 5/8 wave and I got to say over my Imax 2000 that had a factory defect. I feel almost back in the 80's. I had a Radio Shack Crossbow64 back then, and of corse the conditions were crazy back then. I also aquired the Rigexprt 35zoom about a yr ago, then just had to get the Nano VNA, the rigexprt has now quit working and out of warrenty...oh well... any who, I took the seeming silly 3 short radials off the Sigma, added 2) maco V1500 Ground plane hubs and running 8 radials. Seems I changed the take off angle a little more tah I should have. Works "ok" for local, but shines even better when DX is in... I should note on the tune of the Sigma for the USA possable buyer, they tune 1.0 :1 swr @50ohms around 27.500/600 in stock form. With the ground radials, it seemed to "widen" the low SWR range. I'd say a good 60/70 Channel spread. Impedance does change a bit when you get awat from your "sweet spot" of a tune. But nothing crazy. I get Snow, Ice, Wind, Rain, here at my location. Last winter, I thought I lost it, wind and sleet made for heavy ice build up and a serious "lean". Took it down and got the "kinks" out and back together... Tower may go up soon, my climbing abilities are fading. May have to resort back to a imax 2000 a top of the 4el LFA. Just have to see. This cycle 25 so far, has been a great awakening and a re kindle of those ol 1980's days on air. Antenna theory hasn't changed though. 73 2CT351.
Alan - Mirror Man, Roboed and Rjbingham like this post
Call Sign : 108CT233 Posts : 193 Times Thanked : 14 Join date : 2019-12-01 QTH or Location : Central Scotland Equipment Used : CRT SS9900 Beofeng UV5R Yaesu FTDX1200 CRT Micron CRT FP00 Sattelite 2000 antenna ZS6BKW X30 co-linear
Subject: Re: Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Mon Oct 25, 2021 2:31 pm
It does seem you can't go wrong with the original Silver Rod style antenna at times, I have just made several Short Skip contacts with my half wave Ringo vertical and I am pleased to say that included several Charlie Tango stations. Great bandwidth and not so noisy when the weather isn't so great either I notice over the fiberglass antennas.