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Search: Posts Made By: bobsgarage
Forum: Antennas 27-May-2020, 5:29 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
30-2476 MOD 5 Modeled Yagi VHF

All I did was put the reflector from another 30-2476 on this new Super Long Yagi. I had to remove the single reflector and put the 4 reflector on:
...
Forum: Antennas 27-May-2020, 4:33 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
30-2476 MOD 4 Modeled Yagi

Test results were favorable.

http://forum.tvfool.com/attachment.php?attachmentid=3775&stc=1&d=1590555716
...
Forum: Antennas 16-May-2020, 7:12 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Project braced.

One more, before she goes up in the air, today!!

http://forum.tvfool.com/attachment.php?attachmentid=3754&stc=1&d=1589656098

Hey, you guys ! I over calculated the boom length. There is an extra...
Forum: Antennas 15-May-2020, 1:40 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
VHF super-long yagi

Triple O and Tim and whoever else is following this with interest. We had the best weather yesterday after the storms went through. However it wasn't the end of the rains but I had a full three or...
Forum: Antennas 10-May-2020, 11:14 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
I'll let you know when it might be a couple days...

I'll let you know when it might be a couple days before the weather permits me to go back outside and work on it. The antenna itself is done , however it's going to need quite a bit of bracing. It is...
Forum: Antennas 8-May-2020, 4:22 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Tim, Tripleo, I'm going to call this MOD 4, ...

Tim, Tripleo, I'm going to call this MOD 4, here's what I went with, from Tom Ballister:


http://forum.tvfool.com/attachment.php?attachmentid=3712&stc=1&d=1588993197
...
Forum: Antennas 24-Apr-2020, 8:38 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Hi Tim, I know it's complicated. I appreciate...

Hi Tim, I know it's complicated. I appreciate your help. So yes I'm familiar with Holl_ands, he's an antenna modeling Guru. I tried to contact him, maybe he'll contact me.
Forum: Antennas 24-Apr-2020, 3:44 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
Thank you again Tim. So, because I would...

Thank you again Tim.

So, because I would have to start completely over to build a log periodic it looks like I probably won't do that right now. I guess I would be a project for another day.
...
Forum: Antennas 23-Apr-2020, 12:01 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Thanks Tim, I'll look at that dipole calculator. ...

Thanks Tim, I'll look at that dipole calculator.



How do I specify if I'm building an antenna for all hi VHF channels RF 7 - RF 13 ?


Again thanks for the info you just made it interesting...
Forum: Antennas 22-Apr-2020, 10:49 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
220 Mhz

Frequency : 220 MHz
Wavelength : 1364 mm
Rod Diameter : 10 mm
Boom Diameter : 18 mm
Boom Length : 6068 mm
d/lambda : 0.007 ( min.: 0.002 , max.: 0.01 )
D/lambda ...
Forum: Antennas 22-Apr-2020, 10:48 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
183 MHz

Frequency : 183 MHz
Wavelength : 1639 mm
Rod Diameter : 10 mm
Boom Diameter : 18 mm
Boom Length : 7290 mm
d/lambda : 0.006 ( min.: 0.002 , max.: 0.01 )
D/lambda ...
Forum: Antennas 22-Apr-2020, 9:57 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Good info.

Hi Tim,

Thanks for the information.

Not specifically RF 8 that I'm after, it's just a transmitter I am using to measure my results. One reason is it is at least 49 miles away and makes it a far...
Forum: Antennas 22-Apr-2020, 11:36 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
16 Director Mod

After disappointing results adding four elements on to the existing factory antenna (Mod 1), I figured it was time to go for broke. I was already geared up to go further anyhow.

Mod 2. I...
Forum: Antennas 21-Apr-2020, 4:32 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
I've made it to the Forum circuit, asking for...

I've made it to the Forum circuit, asking for advice. Luckily for me a couple of guys offered help over here Tripleo and over on AVS Calaveras.

Both agreed that the length of the boom is the most...
Forum: Antennas 19-Apr-2020, 3:59 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Calaveras low loss combiner

Oh yes, I edited my post to give Calaveras credit. His instructions were if it was a solid polyethylene insulator to make it 10 inches exactly including the connectors. However I missed that...
Forum: Antennas 19-Apr-2020, 1:34 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Tripleo, You said no new ideas but you did...

Tripleo,

You said no new ideas but you did give me some ideas. Today is supposed to be a nice day today and I want to get some progress done.

I'm trying to gather enough knowledge and yours is...
Forum: Antennas 17-Apr-2020, 7:37 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Combatting losses

I haven't done much with the antennas as I am not actually doing things on a scientific plan. So I don't want to start drilling and moving things around till I have a better idea on where things...
Forum: Antennas 12-Apr-2020, 3:25 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
2020-04-12 no changes better results. hmmmm...

Good Morning, the rain subsided overnight, although more is on the way, so climbing back up the ladder today to finish up and possibly some tweaks.

This mornings scan, big improvement!
...
Forum: Antennas 12-Apr-2020, 2:59 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
Antenna pics

Some pictures.

http://forum.tvfool.com/attachment.php?attachmentid=3662&stc=1&d=1586659854


http://forum.tvfool.com/attachment.php?attachmentid=3661&stc=1&d=1586659741
...
Forum: Antennas 12-Apr-2020, 1:26 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
Got the dual VHF moved up !

I almost didn't move the pair, rain was on the radar.
I definitely wanted to get it done though because I think we're going to have rain the next couple days.

I was only about halfway done when...
Forum: Antennas 11-Apr-2020, 3:47 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
More baseline testing

Happy Saturday!
I'm ready to do some testing but not sure what to test today!

So first things first. First thing this morning I did another comparison after my small changes.

Blue trace is...
Forum: Antennas 11-Apr-2020, 1:54 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
Todays Testing

Well, Thanks Tripelo for the suggestions, I figured some testing was in order to isolate the reception issue.

First, I decided to square up every thing, I readjusted the cross bar and readjusted...
Forum: Antennas 10-Apr-2020, 8:14 PM
Replies: 39
Views: 17,174
Posted By bobsgarage
Tripelo! Thanks for your comments. I did another...

Tripelo! Thanks for your comments. I did another rescan after "Straightening" the booms with a cable over the top.

Bear with me as I can't access the print screens from my scan but at least, but...
Forum: Antennas 10-Apr-2020, 5:08 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
Red face Mediocre reception so far.

Here's the initial test. This is the RTL SDR Spectrum analyzer, with the new array pointing at Milwaukee and RF 8.

http://forum.tvfool.com/attachment.php?attachmentid=3646&stc=1&d=1586523217

...
Forum: Antennas 9-Apr-2020, 12:57 AM
Replies: 39
Views: 17,174
Posted By bobsgarage
Build details...

Tripelo, thank you for your Insight. You asked me about the bending strength of the inch and a half aluminized exhaust tubing that forms the crossbar between the two booms. Tubing is fairly stout.
...
Showing results 1 to 25 of 26

 

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