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Old 19-Apr-2017, 11:57 PM   #21
lifespeed
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Quote:
Originally Posted by rabbit73 View Post
Would you consider replacing one of the UHF antennas with a UHF/VHF-High combo antenna like the Winegard HD7698P?
It would have to be the 91XG, because that is the same direction as for KGO RF7, I think.
I really like that XG91, it fixed some multipath dropouts on KPIX RF29 VC5.1 compared to when I had the DB4e aimed at Mt. Sutro. I would probably like to keep it.

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Originally Posted by rabbit73 View Post
Another alternative would be the VHF Kit on top of the DB4e as suggested by ADTech.
But the DB4e points at Mt. Allison. What you suggest could well work . . . or it might not. KGO RF7 is 19dB noise margin, and I am behind a hill in a multi-path situation. It may be surest to sledgehammer it with high antenna directivity and gain. After the re-pack there will be two VHF stations in SF, KGO is moving to 12, and KRON to 7.

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Originally Posted by rabbit73 View Post
If that isn't enough gain, another alternative would be a modified MCM 30-2475 between the 91XG and the DB4e.
Remove the upper and lower reflector rods, leaving just one; its 33-1/8 length should be sufficient for channel 7.
This is an interesting idea. Probably the most ideal thing to do would be to find another location for the DB4e, I have a good location for an eave mount. Overdoing it
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Old 20-Apr-2017, 12:11 AM   #22
rabbit73
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Quote:
But the DB4e points at Mt. Allison. What you suggest could well work . . . or it might not.
If the VHF dipole is not mounted on the DB4e reflector, it can be aimed in any direction you want.
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Old 20-Apr-2017, 1:43 AM   #23
ADTech
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Are you using a Fieldfox handheld VNA/SPA?
Yep, it's a Fieldfox N9923A VNA.

BTW, the specs for the MCM antenna say it's 60" long.
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Last edited by ADTech; 20-Apr-2017 at 11:25 AM.
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