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Radiomaste P30 antenna
Is there anybody using the Radiomaster P30 aka (NASA P-30) shortwave
antenna? I am using a throw together 50 ft long wire and I am wondring about the performance of the P30. Any information from users would be greatly appreciated. The long wire works fine I am just thinking of upgrading. Thanks! Tim |
Hi Tim:
- How much space do you have? Putting up 200 feet of antenna & center feeding it into the receiver with a grounded coax will help with weaker stations.. Dan n article , "Tim ODonnell" writes: Is there anybody using the Radiomaster P30 aka (NASA P-30) shortwave antenna? I am using a throw together 50 ft long wire and I am wondring about the performance of the P30. Any information from users would be greatly appreciated. The long wire works fine I am just thinking of upgrading. Thanks! Tim |
Dan,
If I had the space I would put up a really fine antenna. However I don't so I will do the best that I can. The homeade longwire does pretty good, but I would like to cut down a little noise and also try to get better reception of some of the weaker stations. I often think that I am only listening to the biggies, but sometimes I get lucky and pick up an obscure one. When I read the loggings here in the group I often try them and find only white noise. Sure I realize that location also means something but I feel I can probably do better. That's why I am asking about the P30. It doesn't eat up a lot of space. By the way I think that I may have used one of your suggestions when I put up the 50 foot wire. Because I don't have that much space I strung it on my fence using tv antenna wire standoffs to keep it off the fence. I put a decent balun on it and it works fine and it's not really that visible. I just wish the fence was higher. If I get the P30 I will leave the old one up and string the P30 along the roof. Comments? Tim "Diverd4777" wrote in message ... Hi Tim: - How much space do you have? Putting up 200 feet of antenna & center feeding it into the receiver with a grounded coax will help with weaker stations.. Dan n article , "Tim ODonnell" writes: Is there anybody using the Radiomaster P30 aka (NASA P-30) shortwave antenna? I am using a throw together 50 ft long wire and I am wondring about the performance of the P30. Any information from users would be greatly appreciated. The long wire works fine I am just thinking of upgrading. Thanks! Tim |
Tim,
One thing you will want to check before running your antenna wire on the roof is the possibility of any electrical service wiring running in the attic. It may be that if you have AC wiring in close proximity to the antenna, especially running parallel to it, you could pick up some line noise on your antenna feed. Ken Maltz Jericho, NY NRD-535D, NRD-220 Collins R-388, Racal RA6790/GM, ICOM R71A, ICOM R-7100(x2), AOR AR-8000 Panasonic RF-2200, Sony ICF-7600GR, Hoka Code3 Gold-Pro, 60' long wire, MLB balun |
KM,
What you say/wrote about electical wiring in the Attic is very true. - - - Especially if you have any major electrical equipment mounted in the Attic or on the Roof. Air Conditioners, Fans, ETC. For Attic Electrical Wiring and Noise (When the only place you can put an Antenna is in the Attic.) - - - Think Horizontal Loop Antenna IMHO: The best type of 'antenna' to use in the Attic is a Horizontal Loop Antenna. Loops generally have lower/less man made noise pick-up. * Mount it at least 3-6 Feet above the Attic Floor and follow the Primeter of the Roof. NOTE: This has to be a compromise Height vice Size. * Use a Matching Transformer in the Attic and a Coax FeedLine from the Attic down to the Radio. (More Noise Reduction.) iane ~ RHF .. .. = = = (Ken Maltz) = = = wrote in message ... Tim, One thing you will want to check before running your antenna wire on the roof is the possibility of any electrical service wiring running in the attic. It may be that if you have AC wiring in close proximity to the antenna, especially running parallel to it, you could pick up some line noise on your antenna feed. Ken Maltz Jericho, NY NRD-535D, NRD-220 Collins R-388, Racal RA6790/GM, ICOM R71A, ICOM R-7100(x2), AOR AR-8000 Panasonic RF-2200, Sony ICF-7600GR, Hoka Code3 Gold-Pro, 60' long wire, MLB balun |
Yes RHF, this is an excellent suggestion; as is using a balun matched length of
coax as lead in cable. I fould that replacing my single wire lead in with the MLB balun and good quality coax eliminated at least 90% of man-made electrical noise on my antenna. Ken Maltz Jericho, NY NRD-535D, NRD-220 Collins R-388, Racal RA6790/GM, ICOM R71A, ICOM R-7100(x2), AOR AR-8000 Panasonic RF-2200, Sony ICF-7600GR, Hoka Code3 Gold-Pro, 60' long wire, MLB balun |
RHF wrote:
KM, What you say/wrote about electical wiring in the Attic is very true. - - - Especially if you have any major electrical equipment mounted in the Attic or on the Roof. Air Conditioners, Fans, ETC. For Attic Electrical Wiring and Noise (When the only place you can put an Antenna is in the Attic.) - - - Think Horizontal Loop Antenna IMHO: The best type of 'antenna' to use in the Attic is a Horizontal Loop Antenna. Loops generally have lower/less man made noise pick-up. * Mount it at least 3-6 Feet above the Attic Floor and follow the Primeter of the Roof. NOTE: This has to be a compromise Height vice Size. * Use a Matching Transformer in the Attic and a Coax FeedLine from the Attic down to the Radio. (More Noise Reduction.) iane ~ RHF What would the typical impedance be for such a (horizontal) loop? Would it improve reception to make the section of the loop opposite the feed point go vertically up the attic's gable-end wall to the ridge peak? -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
TD,
The RadioMaster P30 Antenna is only 15 foot (4 m) Long and has a 15 foot (4 m) FeedLine Coax Cable with a PL-239 Connector. You have stated that you plan on placing this new antenna on the Roof. Plus you also state that you have already built a 50 Ft Random Wire Antenna that is mounted on your Fence, with a Balun and Coax FeedLine. IMHO: You have the skills to build your own "On-the-Roof" Antenna. Measure the "Space Available" 'on' or 'under' the Roof to mount this new Antenna. * Consider an "On-the-Roof" Antenna that goes from one corner of the Roof (up and over the roof) to the diagonal corner. (Greatest Length) * Use "Insulated" Wire and the 'wire' will lay directly on the surface of the Roof. * Cut and Build and Antenna to Fill the Space Available. * Use a Balun / Matching Transformer and Coax Cable FeedLine Ready-Made: Here are some commercial antennas that may fit your needs. * RF Systems MLBA-MK2 = 66 Foot (20 meters) - - - http://www.rys.nl/Mlba2.jpg * Par Electronics EF-SWL = 45 Feet of Flex-Weave Wire. - - - http://www.eham.net/reviews/detail/3632 * eHAM Wire and Vertical Antenna Reviews - - - http://www.eham.net/reviews/products/13 iane ~ RHF .. .. = = = "Tim ODonnell" = = = wrote in message ... Dan, If I had the space I would put up a really fine antenna. However I don't so I will do the best that I can. The homeade longwire does pretty good, but I would like to cut down a little noise and also try to get better reception of some of the weaker stations. I often think that I am only listening to the biggies, but sometimes I get lucky and pick up an obscure one. When I read the loggings here in the group I often try them and find only white noise. Sure I realize that location also means something but I feel I can probably do better. That's why I am asking about the P30. It doesn't eat up a lot of space. By the way I think that I may have used one of your suggestions when I put up the 50 foot wire. Because I don't have that much space I strung it on my fence using tv antenna wire standoffs to keep it off the fence. I put a decent balun on it and it works fine and it's not really that visible. I just wish the fence was higher. If I get the P30 I will leave the old one up and string the P30 along the roof. Comments? Tim "Diverd4777" wrote in message ... Hi Tim: - How much space do you have? Putting up 200 feet of antenna & center feeding it into the receiver with a grounded coax will help with weaker stations.. Dan n article , "Tim ODonnell" writes: Is there anybody using the Radiomaster P30 aka (NASA P-30) shortwave antenna? I am using a throw together 50 ft long wire and I am wondring about the performance of the P30. Any information from users would be greatly appreciated. The long wire works fine I am just thinking of upgrading. Thanks! Tim |
= = = starman
= = = wrote in message ... RHF wrote: KM, What you say/wrote about electical wiring in the Attic is very true. - - - Especially if you have any major electrical equipment mounted in the Attic or on the Roof. Air Conditioners, Fans, ETC. For Attic Electrical Wiring and Noise (When the only place you can put an Antenna is in the Attic.) - - - Think Horizontal Loop Antenna IMHO: The best type of 'antenna' to use in the Attic is a Horizontal Loop Antenna. Loops generally have lower/less man made noise pick-up. * Mount it at least 3-6 Feet above the Attic Floor and follow the Primeter of the Roof. NOTE: This has to be a compromise Height vice Size. * Use a Matching Transformer in the Attic and a Coax FeedLine from the Attic down to the Radio. (More Noise Reduction.) iane ~ RHF What would the typical impedance be for such a (horizontal) loop? Would it improve reception to make the section of the loop opposite the feed point go vertically up the attic's gable-end wall to the ridge peak? Starman, Until One Builds It - IT Is An Unknown. * It is my understanding that this would be a "Receive Only" Antenna. * The Impedance may range from 100 - 400 Ohms. * A 1:4 Balun would most likely work will with this In-the-Attic Antenna. * Most likely the feed point would be where you cound get the most direct access for the FeedLine. * * However, YES - The FeedPoint could be 'located' and the Antenna Wire 'configured' to improve reception and directivity. NOTE: Some type of Antenna Tester would be necessary if your were going to play with the wire to improve the reception and directivity qualities. About Roofs: * Not All Roofs are Peaked - Some are Flat. * Not All Roof are Squares/Rectangles - Some are "L" Shaped and other. * * Some Roofs are made of metal :-( OBTW: As I was writing this and thinking of the possible shapes within the confines of an Attic; the SpiderWire Antenna came to mind. = = = http://www.coneantenna.com/Drawings.htm - - - A form of Double Loop Dipole. * If you have a Rectangler High Peaked Roof. * The Feed Point of the Antenna could be mounted at the Center of the Rectangle and the Peak of the Roof. * The Four Legs would then be routed down to the bottom corners of the Roof. * The Leg ends would then be routed flat with the eaves * * OR - The Leg Ends could be routed up & down the Attic's gable-end walls in an Inverted "V". iane ~ RHF .. GoTo= http://groups.yahoo.com/group/SWL-AM-FM-Antenna/ .. |
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