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 Sigma Venom Silver Hot Rod 5/8 wave (tinkering)

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Savwafare10
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Savwafare10


Call Sign : 2-CT-351
Posts : 41
Times Thanked : 1
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/

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PostSubject: Sigma Venom Silver Hot Rod 5/8 wave (tinkering)   Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Icon_minitimeWed 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.

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Alan - Mirror Man
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Major contributor
Alan - Mirror Man


Call Sign : 108CT233
Posts : 201
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

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PostSubject: Re: Sigma Venom Silver Hot Rod 5/8 wave (tinkering)   Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Icon_minitimeMon 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.

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Mudslinger
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Call Sign : 26CT612
Posts : 50
Times Thanked : 0
Join date : 2020-04-14
QTH or Location : West Oxfordshire
Equipment Used : Various SSB sets

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PostSubject: Re: Sigma Venom Silver Hot Rod 5/8 wave (tinkering)   Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Icon_minitimeFri Oct 29, 2021 8:17 pm

The Venoms do work ok, but I feel that the quality of them is far inferior to Silver rods of old. I had one and sent it back because it didn't feel like it would withstand much of a blow, and the way that the joints were cut made it feel pretty poorly made.

Currently I have a Sirio GPE 27 5/8 and the build quality and materials are far better, plus at the time it only cost a few quid more.

The venom could be useful for portable DX due to its light weight, the sirio is over 1kg heavier due to being made from thicker material.

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Savwafare10
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New Member
Savwafare10


Call Sign : 2-CT-351
Posts : 41
Times Thanked : 1
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/

Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Empty
PostSubject: Re: Sigma Venom Silver Hot Rod 5/8 wave (tinkering)   Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Icon_minitimeFri Oct 29, 2021 10:32 pm

We could say that for alot of the "re-made" antennas of the past.  I fully agree this Sigma isn't stout like some of the old GP antennas of the past.  We have high winds around twice a year, Fall into Winter (now) and Winter into Spring. Its already got a "lean" to it at only 20ft off the ground. It's rebuildable.  a few times anyways. Once the tower goes up and the 4el LFA I may have to resort to  a 1/4 wave vertical or go back to Fiberglass. Not a big deal I guess to leave the DX work to the LFA.

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rabbi
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Senior contributor



Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 152
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 64

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PostSubject: Re: Sigma Venom Silver Hot Rod 5/8 wave (tinkering)   Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Icon_minitimeMon Nov 01, 2021 8:17 pm

hi anyone converted the old gp 27 5/6 sections as a hf multiband vertical maybe with a balun i bought a 5 section vertical gp27 looking with an un un balun on is base i have found it has an intermitent fault i payed 100 pounds for it i think if i convert the old type gp 27 for a lot less thanks for looking paul m0bd 73s

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PostSubject: Re: Sigma Venom Silver Hot Rod 5/8 wave (tinkering)   Sigma Venom Silver Hot Rod 5/8 wave (tinkering) Icon_minitime

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