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Hi Gain SPT500 Super Penetrator

Dr_DX

Well-Known Member
Jan 29, 2006
361
433
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
Staff member
Apr 6, 2005
8,004
6,500
593
Nor Cal Sierra Nevada
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
 

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