• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

Hi Gain SPT500 Super Penetrator

Dr_DX

Well-Known Member
Jan 29, 2006
228
251
73
IMHO....

The SPT-500 should be adjusted to an OAL of 267" as a starting point for 11 meters and then fine tuned from there by adjusting length and beta match and/or grounding wire.

For the strongest vertical, if you overlap the joints by 4", the top radiator will have a 4 1\2" overlap and your OAL will be 267". Exposed lengths would be:

M1 = 71"
M2 = 48"
M3 = 51"
M4 = 49.5"
Top = 47.5"

Adjust the beta match and/or ground wire to tune R & X and the OAL for SWR.
 

AudioShockwav

Extraterrestrial Admin
Staff member
Apr 6, 2005
6,948
4,172
343
Sierras Near Yosemite National Park
If they are not angled down, they will be soon.
It's just not the quality that was seen in the past.
Not that anyone would see an actual signal difference but when you live in adverse weather areas, strength matters.

73
Jeff
 

dxChat
Help Users
  • No one is chatting at the moment.
  • @ BJ radionut:
    Hav a Great day OM... late start for me...stayed up till like 1 AM EST binge watching old STAR TREK Voyager episodes ...Started by watching Curse of OAK Island...then buzzed Paramount +...:cool::ROFLMAO: Need to finish Star Trek DISCOVERY Season 4 also(y):LOL:
  • @ BJ radionut:
    DAMN COLD here MINUS 3 BELOW ZERO right at Sunrise EST... WOW NOW a Balmy +1 @ 9: AM:eek:
  • @ BJ radionut:
    WIND CHILL ADVISORY till mid-day...11 mph NORTH wind...real feel temps like minus 10-20 below:barefoot:(n)
  • @ Mark Malcomb:
    So true brother! Stay warm
  • @ 357:
    HkjspUX.jpg