Swipesy
Member
Has anyone had any experience with a Radiall/Larsen FB3825 antenna in a base environment? If so would you be willing to share your experience? This antenna is for the 824-896 band.
Radiall/Larsen FB3825
- Thread starter Swipesy
- Start date
- Status
JohnWayne
Member
I probably wouldn't use one in anything but a temporary installation or if it was inside an attic or similar setup. It's just not meant to live outside for long periods of time. The other problem is the price. You could buy a $12 mobile antenna, a $12 NMO mount, and a piece of aluminum and have the same thing for 1/4 of the price.
If you do want a nice base antenna for 800MHz, then I would look in to a fiberglass style. They will last for years and years, and they will give you very good performance. I sell an assortment of 800MHz base antennas that work very well. I also have mobile antennas and mounts if you wish to construct something like I describer earlier. If you went that route, then I would try and put it in the attic or at least some place sheltered.
Let me know if you have any questions.
Thanks,
Jeff
If you do want a nice base antenna for 800MHz, then I would look in to a fiberglass style. They will last for years and years, and they will give you very good performance. I sell an assortment of 800MHz base antennas that work very well. I also have mobile antennas and mounts if you wish to construct something like I describer earlier. If you went that route, then I would try and put it in the attic or at least some place sheltered.
Let me know if you have any questions.
Thanks,
Jeff
Pro-95
Member
Jeff,
On the page you linked you show a 12 and a 6 element yagi and I'm assuming it's the same pic for both.....
From a builder/tinkerer standpoint I am really interested in how the yagi's are endfired. Could you or would you post some close up's of connector to the driven element. Also in a production antenna how is the driven element seperated from the metal boom and is the seperation at least the distance of one element in diameter?
If you can't or won't post pics I understand. If you'd prefer to email them to me my email addy is sRcEaMnOnVeEr@mTjHwI.cSom remove the upper case letters.
Thanks!
On the page you linked you show a 12 and a 6 element yagi and I'm assuming it's the same pic for both.....
From a builder/tinkerer standpoint I am really interested in how the yagi's are endfired. Could you or would you post some close up's of connector to the driven element. Also in a production antenna how is the driven element seperated from the metal boom and is the seperation at least the distance of one element in diameter?
If you can't or won't post pics I understand. If you'd prefer to email them to me my email addy is sRcEaMnOnVeEr@mTjHwI.cSom remove the upper case letters.
Thanks!
JohnWayne
Member
Yes, I will use "stock" pictures sometimes when the actual item is unavailable or the stock picture looks better than something that we can do. If you want pictures of the actual item, then I can take some and send them to you. I will take some pics of one of the Gold Series beams tomorrow and post them here on the board for you.
Jeff
Jeff
JohnWayne
Member
I got busy yesterday, but today I took a couple pics of an Antenex Gold Series yagi for you. They are 1024x768 to keep the detail, so I'll just post the links:
http://www.waltel.com/DSCN3479.JPG
http://www.waltel.com/DSCN3480.JPG
Let me know if you want some more pics from different angles or what not.
Jeff
http://www.waltel.com/DSCN3479.JPG
http://www.waltel.com/DSCN3480.JPG
Let me know if you want some more pics from different angles or what not.
Jeff
Pro-95
Member
Excellent Jeff! Thanks!
The pics answered my questions I had about the design. I do have one more though. I see set screws holding the two tube sections together for the tuning gap. I assume that these are not to be adjusted by the end user/owner, are these held with locktite or something similar to prevent them from backing out?
Ok one more. The gamma match in the designs I've played with have only 2/10'ths of an inch of the center conductor entering into the outside tube to get ~2pf capacitance. Is the non-conductive spacing inside the tube much further so that there is little chance of it coming out and destroying the match?
Other than that I'm pretty impressed and if I wasn't a cheap son of a gun or a tinkerer I'd jump on the 11db gain unit. Very nice indeed.
The pics answered my questions I had about the design. I do have one more though. I see set screws holding the two tube sections together for the tuning gap. I assume that these are not to be adjusted by the end user/owner, are these held with locktite or something similar to prevent them from backing out?
Ok one more. The gamma match in the designs I've played with have only 2/10'ths of an inch of the center conductor entering into the outside tube to get ~2pf capacitance. Is the non-conductive spacing inside the tube much further so that there is little chance of it coming out and destroying the match?
Other than that I'm pretty impressed and if I wasn't a cheap son of a gun or a tinkerer I'd jump on the 11db gain unit. Very nice indeed.
JohnWayne
Member
You are not supposed to adjust the little bar that is held in place by the set screws. They tune the antennas at the factory to operate on the lowest frequency spec'd for that antenna. I guess if you have a network analyzer then you can play with retuning them for your exact frequency.
You would really have to muscle the gamma match to get the center conductor out of the tube. It is pressed in there very tightly with a peice of Teflon-like material. I should note that the newer Gold Series are all internally directly matched and fed from the end of the antenna. This is nice because the external gamma match tends to ice up and such in the winter. The Silver Series yagi do have the external gamma match, however.
Let me know if you have any more questions.
Jeff
You would really have to muscle the gamma match to get the center conductor out of the tube. It is pressed in there very tightly with a peice of Teflon-like material. I should note that the newer Gold Series are all internally directly matched and fed from the end of the antenna. This is nice because the external gamma match tends to ice up and such in the winter. The Silver Series yagi do have the external gamma match, however.
Let me know if you have any more questions.
Jeff
- Status
Similar threads
