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FS: sma-to-bnc custom fit rubber covered antenna adapter
Do you have a need for a high-quality SMA-to-BNC rubber covered
factory look antenna adapter that is custom made to fit and protect your H.T. or scanner radio? Adapter allows you to: Quickly change antennas to base, mobile or different style use. Use the more popular and wider selection available of BNC antennas. Prevent chassis connector wear or from coming loose due to antenna changes. Adapter features: Gold plated contacts with a teflon insulator. A low profile design with a rubber covering for a factory antenna look. The rubber base seals to the top of the radio with no spacers needed for moisture and dirt protection. The base also provides an excellent support for any length of antenna or application. No need to remove adapter once installed to make a quick and safe BNC style antenna change. Sizes to fit radio models: Yaesu: VX-5R, VX-7R, VX-2R, VX-1R, FT-50-R, FT-60-R, VX-10, VX-150, VX-110, VXA-100, VXA-120, VX-800, VXA-700 Icom: IC-T90A, IC-R5, IC-R2, IC-T8A, IC-T81A, IC-Q7A, IC-M1V Kenwood: TH-D7, TH-G71, TH-F6A, TH-59, TH-K2AT Alinco: DJ-V5, DJ-X3, DJ-S40 Midland : G-11 Maycom : AR108 Standard: C508A, C510, HX-460S Uniden : Atlantis(marine) Tate Orca : Excel Radio Shack: HTX-200, HTX-400, HTX-245, HTX-420 Previewed in the May 2000 Issue of CQ Magazine, and the Nov. 2000 Issue of QST Magazine. $11.95 ea. + $1.50 S+H(One to unlimited) (Check or money order only in U.S.Funds) (Specify-radio-model) STEPHEN G.GULYAS 706 LALOR ST. TRENTON, N.J. 08610 U.S.A. A photo of the adapter is available upon request. I welcome any questions or comments at my email: Thanks for looking at my posting. S.G.G. KC2BHO 73's |
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samw thing without rubber 3.75 at any electroncs store what a rip off but you know you can get in serious trouble without your rubbers . . . Ed |
samw thing without rubber 3.75 at any electroncs store what a rip off but you know you can get in serious trouble without your rubbers . . . Ed |
samw thing without rubber 3.75 at any electroncs store what a rip off but you know you can get in serious trouble without your rubbers . . . Ed |
Brian wrote in
: samw thing without rubber 3.75 at any electroncs store what a rip off And without the rubber, the flex and bending of the antenna gets directly transferred to the sma connector. You'll be wishing you'd had some sort of support before long, as the rig is in the shop with a broken sma connector. Stephens connectors work well, I've had one for years, and think it was one of the smarter accessories I've purchased. (Ft-50) john |
Brian wrote in
: samw thing without rubber 3.75 at any electroncs store what a rip off And without the rubber, the flex and bending of the antenna gets directly transferred to the sma connector. You'll be wishing you'd had some sort of support before long, as the rig is in the shop with a broken sma connector. Stephens connectors work well, I've had one for years, and think it was one of the smarter accessories I've purchased. (Ft-50) john |
Brian wrote in
: samw thing without rubber 3.75 at any electroncs store what a rip off And without the rubber, the flex and bending of the antenna gets directly transferred to the sma connector. You'll be wishing you'd had some sort of support before long, as the rig is in the shop with a broken sma connector. Stephens connectors work well, I've had one for years, and think it was one of the smarter accessories I've purchased. (Ft-50) john |
And without the rubber, the flex and bending of the antenna gets directly transferred to the sma connector. You'll be wishing you'd had some sort of support before long, as the rig is in the shop with a broken sma connector. Stephens connectors work well, I've had one for years, and think it was one of the smarter accessories I've purchased. (Ft-50) john What are "Stephens connectors" ? Any pics and where to buy ? Thanks, Nick |
And without the rubber, the flex and bending of the antenna gets directly transferred to the sma connector. You'll be wishing you'd had some sort of support before long, as the rig is in the shop with a broken sma connector. Stephens connectors work well, I've had one for years, and think it was one of the smarter accessories I've purchased. (Ft-50) john What are "Stephens connectors" ? Any pics and where to buy ? Thanks, Nick |
And without the rubber, the flex and bending of the antenna gets directly transferred to the sma connector. You'll be wishing you'd had some sort of support before long, as the rig is in the shop with a broken sma connector. Stephens connectors work well, I've had one for years, and think it was one of the smarter accessories I've purchased. (Ft-50) john What are "Stephens connectors" ? Any pics and where to buy ? Thanks, Nick |
"nick smith" wrote in news:Sjsqd.221$P23.121
@newsfe5-gui.ntli.net: What are "Stephens connectors" ? Any pics and where to buy ? Thanks, Nick Sizes to fit radio models: Yaesu: VX-5R, VX-7R, VX-2R, VX-1R, FT-50-R, FT-60-R, VX-10, VX-150, VX-110, VXA-100, VXA-120, VX-800, VXA-700 Icom: IC-T90A, IC-R5, IC-R2, IC-T8A, IC-T81A, IC-Q7A, IC-M1V Kenwood: TH-D7, TH-G71, TH-F6A, TH-59, TH-K2AT Alinco: DJ-V5, DJ-X3, DJ-S40 Midland : G-11 Maycom : AR108 Standard: C508A, C510, HX-460S Uniden : Atlantis(marine) Tate Orca : Excel Radio Shack: HTX-200, HTX-400, HTX-245, HTX-420 Previewed in the May 2000 Issue of CQ Magazine, and the Nov. 2000 Issue of QST Magazine. $11.95 ea. + $1.50 S+H(One to unlimited) (Check or money order only in U.S.Funds) (Specify-radio-model) STEPHEN G.GULYAS 706 LALOR ST. TRENTON, N.J. 08610 U.S.A. A photo of the adapter is available upon request. I welcome any questions or comments at my email: Thanks for looking at my posting. S.G.G. KC2BHO 73's |
"nick smith" wrote in news:Sjsqd.221$P23.121
@newsfe5-gui.ntli.net: What are "Stephens connectors" ? Any pics and where to buy ? Thanks, Nick Sizes to fit radio models: Yaesu: VX-5R, VX-7R, VX-2R, VX-1R, FT-50-R, FT-60-R, VX-10, VX-150, VX-110, VXA-100, VXA-120, VX-800, VXA-700 Icom: IC-T90A, IC-R5, IC-R2, IC-T8A, IC-T81A, IC-Q7A, IC-M1V Kenwood: TH-D7, TH-G71, TH-F6A, TH-59, TH-K2AT Alinco: DJ-V5, DJ-X3, DJ-S40 Midland : G-11 Maycom : AR108 Standard: C508A, C510, HX-460S Uniden : Atlantis(marine) Tate Orca : Excel Radio Shack: HTX-200, HTX-400, HTX-245, HTX-420 Previewed in the May 2000 Issue of CQ Magazine, and the Nov. 2000 Issue of QST Magazine. $11.95 ea. + $1.50 S+H(One to unlimited) (Check or money order only in U.S.Funds) (Specify-radio-model) STEPHEN G.GULYAS 706 LALOR ST. TRENTON, N.J. 08610 U.S.A. A photo of the adapter is available upon request. I welcome any questions or comments at my email: Thanks for looking at my posting. S.G.G. KC2BHO 73's |
"nick smith" wrote in news:Sjsqd.221$P23.121
@newsfe5-gui.ntli.net: What are "Stephens connectors" ? Any pics and where to buy ? Thanks, Nick Sizes to fit radio models: Yaesu: VX-5R, VX-7R, VX-2R, VX-1R, FT-50-R, FT-60-R, VX-10, VX-150, VX-110, VXA-100, VXA-120, VX-800, VXA-700 Icom: IC-T90A, IC-R5, IC-R2, IC-T8A, IC-T81A, IC-Q7A, IC-M1V Kenwood: TH-D7, TH-G71, TH-F6A, TH-59, TH-K2AT Alinco: DJ-V5, DJ-X3, DJ-S40 Midland : G-11 Maycom : AR108 Standard: C508A, C510, HX-460S Uniden : Atlantis(marine) Tate Orca : Excel Radio Shack: HTX-200, HTX-400, HTX-245, HTX-420 Previewed in the May 2000 Issue of CQ Magazine, and the Nov. 2000 Issue of QST Magazine. $11.95 ea. + $1.50 S+H(One to unlimited) (Check or money order only in U.S.Funds) (Specify-radio-model) STEPHEN G.GULYAS 706 LALOR ST. TRENTON, N.J. 08610 U.S.A. A photo of the adapter is available upon request. I welcome any questions or comments at my email: Thanks for looking at my posting. S.G.G. KC2BHO 73's |
Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob In article , (Stephen G. Gulyas) wrote: Do you have a need for a high-quality SMA-to-BNC rubber covered factory look antenna adapter that is custom made to fit and protect your H.T. or scanner radio? Adapter allows you to: Quickly change antennas to base, mobile or different style use. Use the more popular and wider selection available of BNC antennas. Prevent chassis connector wear or from coming loose due to antenna changes. Adapter features: Gold plated contacts with a teflon insulator. A low profile design with a rubber covering for a factory antenna look. |
Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob In article , (Stephen G. Gulyas) wrote: Do you have a need for a high-quality SMA-to-BNC rubber covered factory look antenna adapter that is custom made to fit and protect your H.T. or scanner radio? Adapter allows you to: Quickly change antennas to base, mobile or different style use. Use the more popular and wider selection available of BNC antennas. Prevent chassis connector wear or from coming loose due to antenna changes. Adapter features: Gold plated contacts with a teflon insulator. A low profile design with a rubber covering for a factory antenna look. |
Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob In article , (Stephen G. Gulyas) wrote: Do you have a need for a high-quality SMA-to-BNC rubber covered factory look antenna adapter that is custom made to fit and protect your H.T. or scanner radio? Adapter allows you to: Quickly change antennas to base, mobile or different style use. Use the more popular and wider selection available of BNC antennas. Prevent chassis connector wear or from coming loose due to antenna changes. Adapter features: Gold plated contacts with a teflon insulator. A low profile design with a rubber covering for a factory antenna look. |
In article
, Bob Dixon wrote: Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob Adding an adapter to a Transmission Line will have no effect, except to add insertion loss of the adapter. Adding an adapter to the antenna itself MAY cause the antenna charactoristics to change. Most SMA and BNC connecters are used in Transmission Lines, and not antennas themselves. The OP doesn't really explain where the adapter is to be used. Most small handheld devices with external antenna connections have those connection in the Transmission Line and not in the antenna itself. Me |
In article
, Bob Dixon wrote: Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob Adding an adapter to a Transmission Line will have no effect, except to add insertion loss of the adapter. Adding an adapter to the antenna itself MAY cause the antenna charactoristics to change. Most SMA and BNC connecters are used in Transmission Lines, and not antennas themselves. The OP doesn't really explain where the adapter is to be used. Most small handheld devices with external antenna connections have those connection in the Transmission Line and not in the antenna itself. Me |
In article
, Bob Dixon wrote: Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob Adding an adapter to a Transmission Line will have no effect, except to add insertion loss of the adapter. Adding an adapter to the antenna itself MAY cause the antenna charactoristics to change. Most SMA and BNC connecters are used in Transmission Lines, and not antennas themselves. The OP doesn't really explain where the adapter is to be used. Most small handheld devices with external antenna connections have those connection in the Transmission Line and not in the antenna itself. Me |
"Bob Dixon" wrote in message
... Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? What makes you think the effect should be adverse? When you consider all the different radios that a given antenna could be connected to, the change from radio to radio is going to be far greater than what a 3/8" adapter is going to do (consider its electrical length at 2m...). In fact, I would hope that most HT antennas weren't meant to be used with counterpoises, but now that I think about it, I don't really know whether or not that's the case. Anyone? I mean... the radiation pattern of a wire cut 'to length' stuck into a BNC connector on the top of an HT is going to be very seriously distorted relative to the same wire above a near-infinite ground plane. Cell phones often use sleeve dispole antennas to avoid the need for a counterpoise... ---Joel |
"Bob Dixon" wrote in message
... Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? What makes you think the effect should be adverse? When you consider all the different radios that a given antenna could be connected to, the change from radio to radio is going to be far greater than what a 3/8" adapter is going to do (consider its electrical length at 2m...). In fact, I would hope that most HT antennas weren't meant to be used with counterpoises, but now that I think about it, I don't really know whether or not that's the case. Anyone? I mean... the radiation pattern of a wire cut 'to length' stuck into a BNC connector on the top of an HT is going to be very seriously distorted relative to the same wire above a near-infinite ground plane. Cell phones often use sleeve dispole antennas to avoid the need for a counterpoise... ---Joel |
"Bob Dixon" wrote in message
... Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? What makes you think the effect should be adverse? When you consider all the different radios that a given antenna could be connected to, the change from radio to radio is going to be far greater than what a 3/8" adapter is going to do (consider its electrical length at 2m...). In fact, I would hope that most HT antennas weren't meant to be used with counterpoises, but now that I think about it, I don't really know whether or not that's the case. Anyone? I mean... the radiation pattern of a wire cut 'to length' stuck into a BNC connector on the top of an HT is going to be very seriously distorted relative to the same wire above a near-infinite ground plane. Cell phones often use sleeve dispole antennas to avoid the need for a counterpoise... ---Joel |
Me wrote:
In article , Bob Dixon wrote: Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob Adding an adapter to a Transmission Line will have no effect, except to add insertion loss of the adapter. Adding an adapter to the antenna itself MAY cause the antenna charactoristics to change. Most SMA and BNC connecters are used in Transmission Lines, and not antennas themselves. The OP doesn't really explain where the adapter is to be used. Most small handheld devices with external antenna connections have those connection in the Transmission Line and not in the antenna itself. Me That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo | | antenna | | _ ground + bnc/sma || || coax from PA strip || || after | | antenna | | || || shielded antenna (adapter) || _ ground (bnc || || coax from PA strip || || And as we remember, "maximum radiation at the current maximum" (that is, the base of a classic 1/4 wave antenna), you are shielding the point of maximum radiation. From a practical standpoint, you will probably be using a gain-retarded rubber duckie, and the 1 or 2 dB loss from even the worst adapter will be swamped by the -10 dB gain of the duck (that is "minus 10 dB gain"). The rubber-duck will make a 5 watt transmitter sound like a 1/2 watt one. Having another 1 dB of loss will make that 5-watt radio sound like 0.4 instead of 0.5. No big deal. If you can keep your radio from being broken by using a quality adapter, and with a negligible loss in performance, I say, "do it." If you are talking about squeaking out every last bit of signal, such as EME, the answer is "no". But if you are talking about walking around a hamfest on 2m, then spend a few extra bucks to keep from fracturing your antenna connector connection, which these days, most hams can't, or don't know how to, fix. flames invited Your mileage may vary. Dave KZ1O |
Me wrote:
In article , Bob Dixon wrote: Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob Adding an adapter to a Transmission Line will have no effect, except to add insertion loss of the adapter. Adding an adapter to the antenna itself MAY cause the antenna charactoristics to change. Most SMA and BNC connecters are used in Transmission Lines, and not antennas themselves. The OP doesn't really explain where the adapter is to be used. Most small handheld devices with external antenna connections have those connection in the Transmission Line and not in the antenna itself. Me That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo | | antenna | | _ ground + bnc/sma || || coax from PA strip || || after | | antenna | | || || shielded antenna (adapter) || _ ground (bnc || || coax from PA strip || || And as we remember, "maximum radiation at the current maximum" (that is, the base of a classic 1/4 wave antenna), you are shielding the point of maximum radiation. From a practical standpoint, you will probably be using a gain-retarded rubber duckie, and the 1 or 2 dB loss from even the worst adapter will be swamped by the -10 dB gain of the duck (that is "minus 10 dB gain"). The rubber-duck will make a 5 watt transmitter sound like a 1/2 watt one. Having another 1 dB of loss will make that 5-watt radio sound like 0.4 instead of 0.5. No big deal. If you can keep your radio from being broken by using a quality adapter, and with a negligible loss in performance, I say, "do it." If you are talking about squeaking out every last bit of signal, such as EME, the answer is "no". But if you are talking about walking around a hamfest on 2m, then spend a few extra bucks to keep from fracturing your antenna connector connection, which these days, most hams can't, or don't know how to, fix. flames invited Your mileage may vary. Dave KZ1O |
Me wrote:
In article , Bob Dixon wrote: Adding any adaptor would seem to significantly move the radiating portion of the antenna further away from the "ground plane" of the radio. This should affect the operation of the antenna adversely. Comments? Bob Adding an adapter to a Transmission Line will have no effect, except to add insertion loss of the adapter. Adding an adapter to the antenna itself MAY cause the antenna charactoristics to change. Most SMA and BNC connecters are used in Transmission Lines, and not antennas themselves. The OP doesn't really explain where the adapter is to be used. Most small handheld devices with external antenna connections have those connection in the Transmission Line and not in the antenna itself. Me That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo | | antenna | | _ ground + bnc/sma || || coax from PA strip || || after | | antenna | | || || shielded antenna (adapter) || _ ground (bnc || || coax from PA strip || || And as we remember, "maximum radiation at the current maximum" (that is, the base of a classic 1/4 wave antenna), you are shielding the point of maximum radiation. From a practical standpoint, you will probably be using a gain-retarded rubber duckie, and the 1 or 2 dB loss from even the worst adapter will be swamped by the -10 dB gain of the duck (that is "minus 10 dB gain"). The rubber-duck will make a 5 watt transmitter sound like a 1/2 watt one. Having another 1 dB of loss will make that 5-watt radio sound like 0.4 instead of 0.5. No big deal. If you can keep your radio from being broken by using a quality adapter, and with a negligible loss in performance, I say, "do it." If you are talking about squeaking out every last bit of signal, such as EME, the answer is "no". But if you are talking about walking around a hamfest on 2m, then spend a few extra bucks to keep from fracturing your antenna connector connection, which these days, most hams can't, or don't know how to, fix. flames invited Your mileage may vary. Dave KZ1O |
In article ,
Dave Bushong wrote: That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo I have been in the communications field for 35 years, and I have NEVER seen a SMA/BNC antenna connector on a Handheld Radio that didn't have a the RF Ground connected to the ground side of the connector. there are some that use different antenna connectors than SMA/TNC?BNC that are singleended but I have never seen one used that way. CFR (Call for Rference) Tell us all which radios your talking about. Make, Model, Version. Me |
In article ,
Dave Bushong wrote: That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo I have been in the communications field for 35 years, and I have NEVER seen a SMA/BNC antenna connector on a Handheld Radio that didn't have a the RF Ground connected to the ground side of the connector. there are some that use different antenna connectors than SMA/TNC?BNC that are singleended but I have never seen one used that way. CFR (Call for Rference) Tell us all which radios your talking about. Make, Model, Version. Me |
In article ,
Dave Bushong wrote: That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo I have been in the communications field for 35 years, and I have NEVER seen a SMA/BNC antenna connector on a Handheld Radio that didn't have a the RF Ground connected to the ground side of the connector. there are some that use different antenna connectors than SMA/TNC?BNC that are singleended but I have never seen one used that way. CFR (Call for Rference) Tell us all which radios your talking about. Make, Model, Version. Me |
Me wrote:
In article , Dave Bushong wrote: That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo I have been in the communications field for 35 years, and I have NEVER seen a SMA/BNC antenna connector on a Handheld Radio that didn't have a the RF Ground connected to the ground side of the connector. there are some that use different antenna connectors than SMA/TNC?BNC that are singleended but I have never seen one used that way. CFR (Call for Rference) Tell us all which radios your talking about. Make, Model, Version. Me You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. 73, Dave |
Me wrote:
In article , Dave Bushong wrote: That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo I have been in the communications field for 35 years, and I have NEVER seen a SMA/BNC antenna connector on a Handheld Radio that didn't have a the RF Ground connected to the ground side of the connector. there are some that use different antenna connectors than SMA/TNC?BNC that are singleended but I have never seen one used that way. CFR (Call for Rference) Tell us all which radios your talking about. Make, Model, Version. Me You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. 73, Dave |
Me wrote:
In article , Dave Bushong wrote: That is actually not quite true. On an HT, the transmission line ends somewhere inside the radio. The SMA/BNC connector is part of the antenna proper. If you add a sleeve (as the previous poster, "dixon", says), you will be changing the antenna itself. ASCII schematic follows: befo I have been in the communications field for 35 years, and I have NEVER seen a SMA/BNC antenna connector on a Handheld Radio that didn't have a the RF Ground connected to the ground side of the connector. there are some that use different antenna connectors than SMA/TNC?BNC that are singleended but I have never seen one used that way. CFR (Call for Rference) Tell us all which radios your talking about. Make, Model, Version. Me You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. 73, Dave |
In article ,
Dave Bushong wrote: You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. I'd say "may be worse" rather than "will be worse". In some cases, it may be better. From what I've seen (and measured) the actual impedances, "counterpoise" effectiveness, etc. of HT antenna setups vary all over the map, and change constantly depending on a whole bunch of factors... how you grip the HT, whether you happen to be wearing a glove, how you angle the HT near your head (antenna-loading effects from the head can make SWR change dramatically), and probably whether you're sweating or not. A typical HT case is almost certainly _not_ serving as a tuned counterpoise at 2 meters, nor is your arm and body. Adding a centimeter or three of SMA-to-BNC connector to the length of the "counterpoise" may have some small effect in some cases, but I believe that [1] it's as likely to work for you as against you, and [2] it's probably less than the sorts of impedance variations which a typical HT has to face every day as it's moved around the user's head during transmission. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
In article ,
Dave Bushong wrote: You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. I'd say "may be worse" rather than "will be worse". In some cases, it may be better. From what I've seen (and measured) the actual impedances, "counterpoise" effectiveness, etc. of HT antenna setups vary all over the map, and change constantly depending on a whole bunch of factors... how you grip the HT, whether you happen to be wearing a glove, how you angle the HT near your head (antenna-loading effects from the head can make SWR change dramatically), and probably whether you're sweating or not. A typical HT case is almost certainly _not_ serving as a tuned counterpoise at 2 meters, nor is your arm and body. Adding a centimeter or three of SMA-to-BNC connector to the length of the "counterpoise" may have some small effect in some cases, but I believe that [1] it's as likely to work for you as against you, and [2] it's probably less than the sorts of impedance variations which a typical HT has to face every day as it's moved around the user's head during transmission. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
In article ,
Dave Bushong wrote: You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. I'd say "may be worse" rather than "will be worse". In some cases, it may be better. From what I've seen (and measured) the actual impedances, "counterpoise" effectiveness, etc. of HT antenna setups vary all over the map, and change constantly depending on a whole bunch of factors... how you grip the HT, whether you happen to be wearing a glove, how you angle the HT near your head (antenna-loading effects from the head can make SWR change dramatically), and probably whether you're sweating or not. A typical HT case is almost certainly _not_ serving as a tuned counterpoise at 2 meters, nor is your arm and body. Adding a centimeter or three of SMA-to-BNC connector to the length of the "counterpoise" may have some small effect in some cases, but I believe that [1] it's as likely to work for you as against you, and [2] it's probably less than the sorts of impedance variations which a typical HT has to face every day as it's moved around the user's head during transmission. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Not to mention the fact that the reason you're adding the adapter is most
likely because you are putting a better antenna on the HT. I doubt what you *might* lose by moving the feedpoint away from the "counterpoise" is not as much as you gain by changing the antenna; otherwise, why bother? At higher frequencies this may not be the case, but probably not within the realm of a dual-band HT. I've been using the Gulyas adapter for years now. I use it primarily for attaching a Smiley 270 telescopic whip to my VX-5, since that antenna works very well configured as a 5/8-wave on 70cm. The relative gain in performance over the stock antenna is quite noticeable, so in that case, the adapter causes no problems. The fit and appearance of the adapter on that rig is great, too! - Doug "Dave Platt" wrote in message ... In article , Dave Bushong wrote: You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. I'd say "may be worse" rather than "will be worse". In some cases, it may be better. From what I've seen (and measured) the actual impedances, "counterpoise" effectiveness, etc. of HT antenna setups vary all over the map, and change constantly depending on a whole bunch of factors... how you grip the HT, whether you happen to be wearing a glove, how you angle the HT near your head (antenna-loading effects from the head can make SWR change dramatically), and probably whether you're sweating or not. A typical HT case is almost certainly _not_ serving as a tuned counterpoise at 2 meters, nor is your arm and body. Adding a centimeter or three of SMA-to-BNC connector to the length of the "counterpoise" may have some small effect in some cases, but I believe that [1] it's as likely to work for you as against you, and [2] it's probably less than the sorts of impedance variations which a typical HT has to face every day as it's moved around the user's head during transmission. -- Dave Platt AE6EO |
Not to mention the fact that the reason you're adding the adapter is most
likely because you are putting a better antenna on the HT. I doubt what you *might* lose by moving the feedpoint away from the "counterpoise" is not as much as you gain by changing the antenna; otherwise, why bother? At higher frequencies this may not be the case, but probably not within the realm of a dual-band HT. I've been using the Gulyas adapter for years now. I use it primarily for attaching a Smiley 270 telescopic whip to my VX-5, since that antenna works very well configured as a 5/8-wave on 70cm. The relative gain in performance over the stock antenna is quite noticeable, so in that case, the adapter causes no problems. The fit and appearance of the adapter on that rig is great, too! - Doug "Dave Platt" wrote in message ... In article , Dave Bushong wrote: You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. I'd say "may be worse" rather than "will be worse". In some cases, it may be better. From what I've seen (and measured) the actual impedances, "counterpoise" effectiveness, etc. of HT antenna setups vary all over the map, and change constantly depending on a whole bunch of factors... how you grip the HT, whether you happen to be wearing a glove, how you angle the HT near your head (antenna-loading effects from the head can make SWR change dramatically), and probably whether you're sweating or not. A typical HT case is almost certainly _not_ serving as a tuned counterpoise at 2 meters, nor is your arm and body. Adding a centimeter or three of SMA-to-BNC connector to the length of the "counterpoise" may have some small effect in some cases, but I believe that [1] it's as likely to work for you as against you, and [2] it's probably less than the sorts of impedance variations which a typical HT has to face every day as it's moved around the user's head during transmission. -- Dave Platt AE6EO |
Not to mention the fact that the reason you're adding the adapter is most
likely because you are putting a better antenna on the HT. I doubt what you *might* lose by moving the feedpoint away from the "counterpoise" is not as much as you gain by changing the antenna; otherwise, why bother? At higher frequencies this may not be the case, but probably not within the realm of a dual-band HT. I've been using the Gulyas adapter for years now. I use it primarily for attaching a Smiley 270 telescopic whip to my VX-5, since that antenna works very well configured as a 5/8-wave on 70cm. The relative gain in performance over the stock antenna is quite noticeable, so in that case, the adapter causes no problems. The fit and appearance of the adapter on that rig is great, too! - Doug "Dave Platt" wrote in message ... In article , Dave Bushong wrote: You missed my point, I think. The counterpoise is the (poor) metal of the radio and of the user's hand. Any connector/adapter will be coaxial and probably low loss, but the counterpoise stays put. The feedpoint rises but the "ground" plane does not. For an SMA adapter, it might not be enough to hear a difference, but the radiated signal will be worse when using such an adapter. I'd say "may be worse" rather than "will be worse". In some cases, it may be better. From what I've seen (and measured) the actual impedances, "counterpoise" effectiveness, etc. of HT antenna setups vary all over the map, and change constantly depending on a whole bunch of factors... how you grip the HT, whether you happen to be wearing a glove, how you angle the HT near your head (antenna-loading effects from the head can make SWR change dramatically), and probably whether you're sweating or not. A typical HT case is almost certainly _not_ serving as a tuned counterpoise at 2 meters, nor is your arm and body. Adding a centimeter or three of SMA-to-BNC connector to the length of the "counterpoise" may have some small effect in some cases, but I believe that [1] it's as likely to work for you as against you, and [2] it's probably less than the sorts of impedance variations which a typical HT has to face every day as it's moved around the user's head during transmission. -- Dave Platt AE6EO |
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