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Search: Posts Made By: GroundUrMast
Forum: Antennas 10-Nov-2019, 1:38 AM
Replies: 34
Views: 3,162
Posted By GroundUrMast
Agreed; If this was a transmitting antenna you...

Agreed; If this was a transmitting antenna you would want to pay close attention to precise impedance matching so as to minimize power reflected back into the final amplifier stage of the...
Forum: Help With Reception 9-Nov-2019, 4:19 AM
Replies: 6
Views: 449
Posted By GroundUrMast
I ran a search at rabbitears.info using an...

I ran a search at rabbitears.info using an estimate of your location. The results I saw suggest you may need to mount as high as 60' AGL to obtain line-of-sight conditions which the ANT751 would do...
Forum: Enthusiast's Exchange 7-Nov-2019, 6:56 AM
Replies: 1
Views: 2,881
Posted By GroundUrMast
Using crontab for recurring recordings

I also use crontab to schedule recurring recordings. The following example represents my daily newscast recording schedule. I can watch a news cast until it is overwritten by the next scheduled...
Forum: Help With Reception 30-Oct-2019, 5:56 PM
Replies: 9
Views: 496
Posted By GroundUrMast
Doubling the antennas will in theory double the...

Doubling the antennas will in theory double the total received power... Expressed logarithmicly, that's 3dB. In practice you also have to consider loss in the cabling and combiner network as well as...
Forum: Help With Reception 29-Oct-2019, 8:51 PM
Replies: 9
Views: 496
Posted By GroundUrMast
You're doing remarkably well as is. I doubt that...

You're doing remarkably well as is. I doubt that quadrupling the height of your antennas or replacing them with custom built designs that added 10 dB of gain compared to what you already have would...
Forum: Enthusiast's Exchange 26-Oct-2019, 2:06 AM
Replies: 1
Views: 2,881
Posted By GroundUrMast
Personal Video Recorder (PVR) using SiliconDust tuner(s) and scripting on Linux

Edited 11/6/2019 - Updated Version of Script Code. Added locking feature to avoid race condition when two or more recordings begin at the same time.

I've tried several different Home Theater...
Forum: Help With Reception 25-Oct-2019, 8:16 AM
Replies: 15
Views: 1,179
Posted By GroundUrMast
Yes... If there is truly need for amplification,...

Yes... If there is truly need for amplification, placing the preamp as close as possible to the antenna will maximize the positive effects on the total system signal to noise ratio.
Forum: TV Fool Discussion / Database Updates 20-Oct-2019, 12:42 AM
Replies: 4
Views: 1,467
Posted By GroundUrMast
The majority of the Seattle market stations...

The majority of the Seattle market stations moving due to the repack are now up and operating on their post-repack frequencies.

The only exception that I can see as of now is KWDK which is still...
Forum: Help With Reception 11-Oct-2019, 1:18 AM
Replies: 9
Views: 969
Posted By GroundUrMast
Are any other channels effected?

Are any other channels effected?
Forum: TV Fool Discussion / Database Updates 4-Oct-2019, 11:29 PM
Replies: 4
Views: 1,467
Posted By GroundUrMast
For those outside the Seattle market: ...

For those outside the Seattle market:

Several of the major network stations are advertising October 19th, 2019 as the cut date for their re-pack moves.
Forum: Special Topics 29-Sep-2019, 11:25 PM
Replies: 5
Views: 437
Posted By GroundUrMast
I can't think of any reason not to place...

I can't think of any reason not to place insulated wire against pipe or conduit. (I would caution against placing the mast or coax bonding conductor inside metal conduit though. The metal conduit...
Forum: Special Topics 29-Sep-2019, 5:54 PM
Replies: 5
Views: 437
Posted By GroundUrMast
It looks like we were both writing and posting at...

It looks like we were both writing and posting at the same time :)


1. Yes, I would opt to use only the existing electrical service GES. This would allow you to avoid the need for expensive #6...
Forum: Special Topics 29-Sep-2019, 5:19 PM
Replies: 5
Views: 437
Posted By GroundUrMast
Rather than running #6 AWG all the way around or...

Rather than running #6 AWG all the way around or over your house, consider abandoning the isolated ground rod and running #10 AWG from the mast to the electrical service... The electrical service...
Forum: TV Fool Discussion / Database Updates 21-Sep-2019, 6:16 PM
Replies: 4
Views: 1,467
Posted By GroundUrMast
Thanks for that detailed information Tower Guy. ...

Thanks for that detailed information Tower Guy. So far, my attempts to contact KING-TV engineering staff have been unsuccessful. I'm hoping to obtain first hand info re. their repack time line.
...
Forum: TV Fool Discussion / Database Updates 20-Sep-2019, 11:24 PM
Replies: 4
Views: 1,467
Posted By GroundUrMast
Seattle Area KING-TV

It appears that KING-TV (Virt. Chans. 5.1, 5.2 & 5.3 -- Rea-CH 48) is operating at reduced power and/or on their auxiliary antenna. On 9/19/2019 I began seeing lower raw signal levels reported by my...
Forum: Enthusiast's Exchange 13-Sep-2019, 12:06 AM
Replies: 11
Views: 9,806
Posted By GroundUrMast
TheFu, Thanks for sharing this. Given the...

TheFu, Thanks for sharing this. Given the hardware transcoding capability of my HDHomeRun EXTEND
(Model: HDTC-2US), I had not considered the need for ffmpeg. Using either the command line or GUI to...
Forum: Special Topics 25-Aug-2019, 3:48 AM
Replies: 6
Views: 923
Posted By GroundUrMast
I have drilled through the roof deck and then in...

I have drilled through the roof deck and then in the attic added 2X4 or heavier stock as a backer cleat to lag or bolt through. But if I'm understanding your post, you don't have attic access??? I...
Forum: Antennas 19-Aug-2019, 3:38 PM
Replies: 49
Views: 43,339
Posted By GroundUrMast
Both... In a typical residential area with...

Both...

In a typical residential area with above ground poles, you see one or more high voltage lines at the top of the pole. If you look closely, the pole mounted transformer is connected to one...
Forum: Antennas 19-Aug-2019, 7:11 AM
Replies: 34
Views: 3,162
Posted By GroundUrMast
Here is another online calculator, for designing...

Here is another online calculator, for designing a Log-Periodic-Dipole-Array.

https://hamwaves.com/lpda/en/index.html
Forum: Help With Reception 17-Aug-2019, 6:43 PM
Replies: 6
Views: 1,507
Posted By GroundUrMast
It appears that your area has an abundance of...

It appears that your area has an abundance of trees. I face the same problem here in the Northwest. Even though simulations predict noise margins for my stations of interest to be in the rage of +41...
Forum: Antennas 13-Aug-2019, 1:09 AM
Replies: 34
Views: 3,162
Posted By GroundUrMast
I need to get back up to speed with 4NEC2...

I need to get back up to speed with 4NEC2 still... But I expect to prove you right. There are a few things that can be done to broaden the frequency response of an antenna. The first that comes to...
Forum: Help With Reception 12-Aug-2019, 2:38 AM
Replies: 31
Views: 2,209
Posted By GroundUrMast
If the shades are plastic they will have no...

If the shades are plastic they will have no significant effect on the antenna performance. If they are metallic they will have quite a bit of effect which will be frequency dependent. If the distance...
Forum: Antennas 12-Aug-2019, 2:06 AM
Replies: 34
Views: 3,162
Posted By GroundUrMast
You're right Joe... Finding any commercially made...

You're right Joe... Finding any commercially made L-VHF antennas has become nigh-on-impossible. I've just finished installing 4NEC2 antenna modeling software on my new computer so as I get back up to...
Forum: Antennas 11-Aug-2019, 4:18 AM
Replies: 49
Views: 43,339
Posted By GroundUrMast
Yes. For example I live in an area that has high...

Yes. For example I live in an area that has high voltage transmission lines within a quarter mile. If there was a line down there will be high voltage at the point of contact to the earth and the...
Forum: Antennas 11-Aug-2019, 4:05 AM
Replies: 49
Views: 43,339
Posted By GroundUrMast
You are correct, the NEC makes reference to 25...

You are correct, the NEC makes reference to 25 ohms in 250.53 and requires an additional rod if that value is not achieved. Until a few years ago, the area I live in was so well known for poor ground...
Showing results 1 to 25 of 500

 

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