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Director Spacing When Extending Boom

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Old 05-05-2019, 03:25 PM   #16  
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Default Frankentenna

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Originally Posted by wizwor View Post
Frankentenna is no more. Heroes and Icons showed up on a subchannel of WSBK in Boston, so I disassembled Frankentenna. I am considering resurrecting a UHF version of Frankentenna to pull in WCSH which is home to AntennaTV which is home to The Tonight Show featuring Johnny Carson.

No. It would be sacrilegious to try to improve upon the VERY BEST vhf-high yagi ever made

Seriously, the damn thing is practically perfect as is. I might have extended it if i could get a couple more, but by the time I got around to playing, these things were not available. Extending with a Y5-7-13 would still offer less gain than Frankentenna.
Wizwor, thanks for coming back to this thread with your final decision and results.

I found your Frankentenna project interesting because I had considered that myself. My plan was to buy 4 of the 30 - 2476 antennas on the four purchase discount. I could keep a couple of or sell a couple, it didn't matter to me as the price was very reasonable at $31 each.

I was going to take some aluminum box tubing to reinforce the original boom from the inside and possibly make a support cable if needed. I never got that far, but I want to still commit one of my masts for DX'ing.

The Frankentenna idea appealed to me because I didn't want to run my already setup and guyed mast up higher to make room for stacking another 30 - 2476.

At any rate, I read somewhere where extending the boom will not get as much gain as stacking two of them.

As far as your Y 10 - 7 - 13, if you don't need the extra gain, might as well leave it the way it is. Sounded like it would be an interesting project though.

I was amazed to see this review comparing the two aforementioned antennas:

http://www.antennahacks.com/Comparis...ar_30-2476.htm

The author has a lot of good things to say about the 30-2476, it is almost as good as the Y10 - 7 - 13.

Tell us about your UHF Frankentenna please


Last edited by Chiwaukee OTA; 05-05-2019 at 03:39 PM..
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Old 05-05-2019, 04:01 PM   #17  
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I never had any luck ganging antennas vertically or horizontally. Extending the 30-2476 increased gain while decreasing beam width -- which is not an issue when targeting a single station. It worked well and I recommend you give it a go. Were I to put Frankentenna outside, I would probably sit it on a 2x4x16.

I agree with the review you linked to. I would add a note that the 30-2476 is easier to extend, more readily available, and less expensive. All those things matter in the real world.
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Old 05-05-2019, 04:36 PM   #18  
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I never had any luck ganging antennas vertically or horizontally. Extending the 30-2476 increased gain while decreasing beam width -- which is not an issue when targeting a single station. It worked well and I recommend you give it a go. Were I to put Frankentenna outside, I would probably sit it on a 2x4x16.

I agree with the review you linked to. I would add a note that the 30-2476 is easier to extend, more readily available, and less expensive. All those things matter in the real world.
What do you mean? You would use a 2 by 4 by 16 as a frame? I guess because it's wood, it's probably okay..

. I realize in the real world, the antenna with its increased length give you more gain, but were you able to measure it in any kind of way? Even a TV signal meter? I'm pretty curious about that.

Another question comes to mind. You don't have a picture of your plan or where to cut the Boom or where do we move the directors or the spacing of such?

How many antennas did you have to buy to build your Frankentenna?

Last edited by Chiwaukee OTA; 05-05-2019 at 04:39 PM..
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Old 05-05-2019, 04:53 PM   #19  
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I would mount a pressure treated 2x4x16 on the mast and build frankentenna on top.

from https://freetvforme.wordpress.com/20...r-labs-30-2476...

Quote:
Replacing the Y10-7-13 with the 30-2476 changed nothing. WMTW was in and out just as it was with the Y10-7-13. I removed the front-most director from the 30-2476 and attached a second front section. Reception improved dramatically. Dropouts persisted, but were less frequent. I added a third section and the dropouts were gone. The HDHomeRun indicated 85-100% signal strength, 55-70% signal quality, and, most importantly, 100% symbol quality.
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Old 05-07-2019, 05:57 AM   #20  
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Originally Posted by wizwor View Post
Frankentenna is no more. Heroes and Icons showed up on a subchannel of WSBK in Boston, so I disassembled Frankentenna. I am considering resurrecting a UHF version of Frankentenna to pull in WCSH which is home to AntennaTV which is home to The Tonight Show featuring Johnny Carson

So you disassembled Frankentenna? Very sad to hear but I see you could use the space in your attic for storage if you need it . What will you do with the pieces ?

So what about UHF Frankentenna ? What is your design?


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Old 05-07-2019, 10:21 PM   #21  
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So you disassembled Frankentenna? Very sad to hear but I see you could use the space in your attic for storage if you need it . What will you do with the pieces ?

So what about UHF Frankentenna ? What is your design?


It's not so sad. Once H&I came to WSBK, there really was nothing in Portland to look at -- at least on VHF. I have a DB8e to point at Portland to see if I can pull in WCSH.

For now, I am pretty happy with my reception. I am playing with DVRs again. I have a Tablo TV DVR which may end up being dedicated to WCSH. I do not expect UHF dxing to be as successful as VHF, but I used to pick up WCSH from the back of a DB8e, so who knows.
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Old 05-08-2019, 01:02 PM   #22  
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Default UHF Frankentenna ?

Pi
Quote:
Originally Posted by wizwor View Post
It's not so sad. Once H&I came to WSBK, there really was nothing in Portland to look at -- at least on VHF. I have a DB8e to point at Portland to see if I can pull in WCSH.

For now, I am pretty happy with my reception. I do not expect UHF dxing to be as successful as VHF, but I used to pick up WCSH from the back of a DB8e, so who knows.
So you disassembled Frankentenna? What will you do with the pieces ?

So what about UHF Frankentenna ? What is your design? I followed your DVR link, and read your blog I found something from 2016 about a DB-8 with an enhanced reflector, is that it?



Last edited by Chiwaukee OTA; 05-10-2019 at 05:11 AM..
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Old 05-16-2019, 01:30 AM   #23  
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One of the antennas is on a roof in Kingston New Hampshire, one is on a roof in Ebeemee Township in Maine, and one is pointed at WMUR and WENH in my attic. The fourth (and a Y5-7-13 and aY10-7-13 and a DB8e) is in a corner of my attic eagerly awaiting reassignment.

I will certainly try to pull in CSH with the DB8e sitting on the floor of my attic, but likely have will have to buy a very directional CM-2020. The only mod I would do is to put a bigger reflector behind the DB8e.

This is all back burner for me. It's a lot of expense and effort to collect old episodes of the Tonight Show. Add The Tomorrow Show to the schedule, and I'll get excited.

Last edited by wizwor; 05-16-2019 at 01:55 AM..
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Old 05-19-2019, 06:25 PM   #24  
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Default Antennacraft Y10-7-13

The Antennacraft Y10-7-13 are "outstanding" antennas.

I just finished a complete refurbishment of two into a pristine stack array.

These are looking for a new home, if anyone is interested.

https://i.imgur.com/gTkVi5n.jpg

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Old Yesterday, 06:16 AM   #25  
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Quote:
Originally Posted by PCTools View Post
The Antennacraft Y10-7-13 are "outstanding" antennas.

I just finished a complete refurbishment of two into a pristine stack array.

These are looking for a new home,

Damn, right about the time I'm thinking about my VHF situation. I'm interested, but how would you ship them?

I realize they have to be disassembled but to what degree?

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Old Yesterday, 08:55 AM   #26  
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Quote:
Originally Posted by PCTools View Post
The Antennacraft Y10-7-13 are "outstanding" antennas.

I just finished a complete refurbishment of two into a pristine stack array.

These are looking for a new home, if anyone is interested.

https://i.imgur.com/gTkVi5n.jpg

Nice job, looks like new, but I hope you didn't buff or sand blast the radials down or sand them with some fine emery-cloth to look new, as that would remove the protective anodizing from the aluminum and they will corrode real fast.
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Old Yesterday, 01:13 PM   #27  
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Cool

Oh, I totally agree. You do not want to hurt or decay the finish of the antenna.

As a ham radio operator, I have spent a lot of time working and refurbishing antennas.

These are fully hand polished to a mirror finish.

You should see how many Channel Master Parabolic Antennas look after a custom rebuild.






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Old Yesterday, 06:35 PM   #28  
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Yah they look great, but how do you protect the aluminum once they are polished up?

I use to know a guy that did anodizing and plating, I took all my refurb's to him (don't do it anymore) and had them re-anodized, some are still up there, and looking good after 50 years.
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Old Yesterday, 06:37 PM   #29  
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This usually will provide a good 5 - 6 years of no issues.

I then take down and repeat the process and replace the balun and coax.

For the 91XG's I applied a clear coat over the entire antenna. :-)
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