TV Fool  

Go Back   TV Fool > Over The Air Services > Help With Reception

Notices

Reply
 
Thread Tools
Old 19-Apr-2017, 10:57 PM   #21
lifespeed
Junior Member
 
Join Date: Dec 2016
Posts: 14
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.

Quote:
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.

Quote:
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
lifespeed is offline   Reply With Quote
Old 19-Apr-2017, 11:11 PM   #22
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,747
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.
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html
rabbit73 is offline   Reply With Quote
Old 20-Apr-2017, 12:43 AM   #23
ADTech
Antennas Direct Tech Supp
 
Join Date: Jan 2010
Posts: 2,942
Quote:
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.
__________________
Antennas Direct Tech Support

For support and recommendations regarding our products, please contact us directly at https://www.antennasdirect.com/customer-service.html

Sorry, I'm not a mod and cannot assist with your site registration.

Last edited by ADTech; 20-Apr-2017 at 10:25 AM.
ADTech is offline   Reply With Quote
Reply

Bookmarks

Tags
diplexer combiner vhf

Go Back   TV Fool > Over The Air Services > Help With Reception


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off




All times are GMT. The time now is 8:18 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © TV Fool, LLC