Beautiful antenna . Did you know you can soften epoxy resins with heat ? Yes you can actually heat up that fiberglass to aluminium base with a electric heat gun and easily remove it therefore you can repair the antenna without destroying the fiberglass pole . That pigtail hanging off the side is a tuning device , there made open or shorted to help the filtering
Dear colleague, first of all I want to introduce myself: I am Carlos Valero YY5CAV, I am writing to you from Venezuela, South America and I want to thank you immensely for publishing this video where you show the inside of a Marine VHF antenna, it should be noted that I am repairing a similar antenna for a good colleague and friend Rafael Rodríguez YY5RJR who has an apartment on the beach and belongs to a water rescue group, days ago they gave him a fiberglass antenna very similar to the one you show in your video. At first glance it looks like a J Pole, but it makes me doubt because there are two bronze alloy pipes, one shorter than the other and inside it the piping or center of the coaxial cable. Regarding the problem of your condominium, I would take advantage of the antenna cover that you took and inside it I would place a J Pole dual band VHF/UHF antenna manufactured by you with 300 Ω flat cable for the amateur range, colleague, I say goodbye thanking you again for posting that video. Success with your projects.
The first step is to measure everything as accurately as you can and then see how the various lengths relate to the wavelength it was designed to operate on. How long is that piece of coax that doesn't have a jacket, only the braided shield? Also, before trying to convert to 2m, see if you can get it to work on 156.8 with a low SWR. Once you have it working on the high end of VHF high, in the marine band, then you will be in a better position to retune it. Each section of the antenna will need to be lengthened a bit. At 156.8, VHF Marine channel 16, a 1/2 wave is 2.98 feet. If the antenna were to have 3dBd of gain it should be a bit longer than 2 half waves, around 6.5 to 7 feet. For 6dBd of gain you'd be looking at twice that or about 13 to 14 feet or a bit shorter depending on how thick the conductors are and how much spacing between half wave elements they feel is necessary, if any. The ARRL antenna book describes dipole arrays used in VHF and UHF antennas and will give you some info on spacing. Catch you on 625. 73 and have a nice day, thanks for the video.
I tore apart another broken Shakespeare 6dB antenna and all I saw inside was coax running up until it was only 2-ish feet of center conductor with the dielectric at the top. This one obviously has way more to it.
Maybe the difference between a $39 antenna and a $139 antenna. I always wondered what the price difference bought you. I wonder how the performance is if they are both 6 dB?
It's a stacked collinear antenna (multiple wavelengths stacked on top of each other to produce omni-directional gain). The little braid section is probably a tuning stub. I have a similar marine antenna but the coax is damaged near the base of the antenna. I wonder if there's any way to get the metal bottom section loose (perhaps with heat?) to solder a new coax to the antenna?
I would love to reverse engineer this antenna. Did you ever take any precise measurements or make a parts list? Looks like the coils at the top are some kind of RFI choke. It would be really cool if you made a parts list with measurements for this antenna. Maybe count the coils awg wire (stranded or solid) and diameter of the core and material. Diameter and length of sleeves. If you still have this antenna I would really appreciate it if you could. Maybe put a parts and measurements list in the description of your video. I am reading about sleeve antennas to try and make one like this. If you made a parts list with details it would save me a lot of time :) ;) LIKED AND SUBSCRIBED! Thanks for the video.
This is the same as a coaxial half wave antenna with the added half wave section that's loaded . so it becomes coliner gain antenna
Beautiful antenna . Did you know you can soften epoxy resins with heat ? Yes you can actually heat up that fiberglass to aluminium base with a electric heat gun and easily remove it therefore you can repair the antenna without destroying the fiberglass pole .
That pigtail hanging off the side is a tuning device , there made open or shorted to help the filtering
Dear colleague, first of all I want to introduce myself: I am Carlos Valero YY5CAV, I am writing to you from Venezuela, South America and I want to thank you immensely for publishing this video where you show the inside of a Marine VHF antenna, it should be noted that I am repairing a similar antenna for a good colleague and friend Rafael Rodríguez YY5RJR who has an apartment on the beach and belongs to a water rescue group, days ago they gave him a fiberglass antenna very similar to the one you show in your video. At first glance it looks like a J Pole, but it makes me doubt because there are two bronze alloy pipes, one shorter than the other and inside it the piping or center of the coaxial cable. Regarding the problem of your condominium, I would take advantage of the antenna cover that you took and inside it I would place a J Pole dual band VHF/UHF antenna manufactured by you with 300 Ω flat cable for the amateur range, colleague, I say goodbye thanking you again for posting that video. Success with your projects.
The first step is to measure everything as accurately as you can and then see how the various lengths relate to the wavelength it was designed to operate on. How long is that piece of coax that doesn't have a jacket, only the braided shield? Also, before trying to convert to 2m, see if you can get it to work on 156.8 with a low SWR. Once you have it working on the high end of VHF high, in the marine band, then you will be in a better position to retune it. Each section of the antenna will need to be lengthened a bit. At 156.8, VHF Marine channel 16, a 1/2 wave is 2.98 feet. If the antenna were to have 3dBd of gain it should be a bit longer than 2 half waves, around 6.5 to 7 feet. For 6dBd of gain you'd be looking at twice that or about 13 to 14 feet or a bit shorter depending on how thick the conductors are and how much spacing between half wave elements they feel is necessary, if any. The ARRL antenna book describes dipole arrays used in VHF and UHF antennas and will give you some info on spacing. Catch you on 625. 73 and have a nice day, thanks for the video.
thanks man !
I tore apart another broken Shakespeare 6dB antenna and all I saw inside was coax running up until it was only 2-ish feet of center conductor with the dielectric at the top. This one obviously has way more to it.
Maybe the difference between a $39 antenna and a $139 antenna. I always wondered what the price difference bought you. I wonder how the performance is if they are both 6 dB?
It's a stacked collinear antenna (multiple wavelengths stacked on top of each other to produce omni-directional gain). The little braid section is probably a tuning stub. I have a similar marine antenna but the coax is damaged near the base of the antenna. I wonder if there's any way to get the metal bottom section loose (perhaps with heat?) to solder a new coax to the antenna?
Use a heatgun on the bottom piece to lossen the epoxy glue. it will slide right off!
I would love to reverse engineer this antenna. Did you ever take any precise measurements or make a parts list? Looks like the coils at the top are some kind of RFI choke. It would be really cool if you made a parts list with measurements for this antenna. Maybe count the coils awg wire (stranded or solid) and diameter of the core and material. Diameter and length of sleeves. If you still have this antenna I would really appreciate it if you could. Maybe put a parts and measurements list in the description of your video.
I am reading about sleeve antennas to try and make one like this. If you made a parts list with details it would save me a lot of time :) ;)
LIKED AND SUBSCRIBED! Thanks for the video.
my friend how check antena by multi meter value showing ohms kilo ohms mag ohms or not showing any value
Did they use an alupex pipe for the outer cover?
Had to bail because of the shaky camera.
Lol what a ridiculous thing to pick on and say