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Search: Posts Made By: GroundUrMast
Forum: Antennas 26-Feb-2015, 10:21 PM
Replies: 18
Views: 44,188
Posted By GroundUrMast
The minimum separation between the UHF and H-VHF...

The minimum separation between the UHF and H-VHF would be about 3', more is better but after about 5' there's very little interaction.

There's not a hard fast rule re. which antenna should be on...
Forum: Antennas 2-Sep-2012, 12:58 AM
Replies: 18
Views: 44,188
Posted By GroundUrMast
Unfortunately, no. A Multimeter or DVM is going...

Unfortunately, no. A Multimeter or DVM is going to apply DC (0 Hz) to the devise when measuring resistance. The antenna operates in the 50 to 700 MHz range... A DVM does not.

An RF impedance...
Forum: Antennas 1-Sep-2012, 5:21 PM
Replies: 18
Views: 44,188
Posted By GroundUrMast
I attempted to describe that in post #10 of this...

I attempted to describe that in post #10 of this thread...

An important concept to read up on... develop an understanding of is: A section of transmission line (coax, twin-lead, etc.) that's 1/4...
Forum: Antennas 1-Sep-2012, 5:25 AM
Replies: 18
Views: 44,188
Posted By GroundUrMast
If your goal is maximum gain, yes you need to...

If your goal is maximum gain, yes you need to eliminate the combiner losses to the extent possible. However, simply combining side by side antennas can give you a more directional antenna regardless...
Forum: Antennas 23-Aug-2012, 6:10 PM
Replies: 18
Views: 44,188
Posted By GroundUrMast
Perhaps the easiest way to describe a practical...

Perhaps the easiest way to describe a practical low loss combiner is to simply have you look at a panel style UHF antenna. The DB4e is just as good an example as any... In the case of the DB4e, they...
Forum: Antennas 23-Aug-2012, 5:34 AM
Replies: 18
Views: 44,188
Posted By GroundUrMast
Ahhhh... Consider, if both antennas receive...

Ahhhh...

Consider, if both antennas receive identical amounts of power and then deliver equal signal power to their respective combiner ports, the combiner is being driven with twice as much power...
Forum: Antennas 22-Aug-2012, 5:32 PM
Replies: 18
Views: 44,188
Posted By GroundUrMast
I should ask... are you targeting different...

I should ask... are you targeting different signals with each antenna? Or are you combining two antennas for the purpose of increased gain? Or are you trying to null out an interfering signal?

If...
Forum: Antennas 21-Aug-2012, 12:54 AM
Replies: 18
Views: 44,188
Posted By GroundUrMast
I would err on the side of caution, measure from...

I would err on the side of caution, measure from the bottom most part of the upper antenna to the upper most part of the lower antenna.

The reflector and metallic structure of one antenna can have...
Forum: Antennas 15-Mar-2011, 5:10 PM
Replies: 18
Views: 44,188
Posted By GroundUrMast
Antenna Spacing Guidelines

Here is a single page guide regarding the distance antennas should be from adjacent antennas.

Antenna Spacing (http://www.tonercable.com/assets/files/TechnicalReference/antenna.pdf)

Scoure:...
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