RE: [Repeater-Builder] Height Gain figure
Not always To: Repeater-Builder@yahoogroups.com From: [EMAIL PROTECTED] Date: Sun, 10 Aug 2008 23:19:52 -0500 Subject: RE: [Repeater-Builder] Height Gain figure So if the antenna is already at 1000 feet height and it is moved up another 100 feet to 1100 feet, you are going to increase the range by 14 miles?? 73 Gary K4FMX From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, August 10, 2008 3:20 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Height Gain figure It is interesting to see the many responses, none of which I have problems with, but all seem to skirt your question. If you are moving the site any distance from the present site, then it is very true that these variables must be considered. If you are moving only a very short distance from your current site, then, I believe what you are looking for is a simple formula to givr a close guess of what to expect. I think you will find that should yout take the square root of the change in height, in this case, the square root of 100 which is 10, and mulitply that by the square root of 2, which is 1.414, you will come up with an approximattion of 14 or so miles improvement. Again, as others have pointed out, many variables inter into the equasion, but then, the bumble bee can not fly either. . . .. Hope this helps. 73 and cheers, Gene, W4FWG -- Original message from Chuck Kimball [EMAIL PROTECTED]: -- At one point I had read a number for figuring out the gain you get by increasing the height. Of course at the moment I'm unable to locate that. ie: If I move the same antenna (VHF 2m) up a hill and gain 100' of elevation, but it costs me the line loss (300'), did I really gain anything. I'll figure in the line loss, and adjust the hardline to minimize the loss, but I'm looking for the number to compare how much gain (in db) did I get with the increased height. So... Anyone know what number is for gain as a function of height? or know a reference I can look up. Thanks Chuck n0nhj _ Meet singles near you. Try ninemsn dating now! http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fdating%2Eninemsn%2Ecom%2Eau%2Fchannel%2Findex%2Easpx%3Ftrackingid%3D1046247_t=773166080_r=WL_TAGLINE_m=EXT
Re: RE: [Repeater-Builder] Re: UHF antenna
This is how it goes. First, i had high SWR, by any calculations. I try to made two versions of antennas: One with just hot on top of 1/4 element and one version with 1/4element with short hot and cold end. with Slim Jim, i got good results, SWR a little bit high but ok (1.6) and had good range. With co-co antenna i had problem with sensitivity. Yes, it was only 4 elements. SWR issue is solved with NO turns, rings or whatsoever! Point is than when cable EXIT from balun (copper tube) (i used rg58, .66 v factor) it has to have some xx cm length before cut and connect to connector (i didnt have female N so used SO239). There i connected RG213 and with a few different lengths of RG213 i got SWR between 1.1 to 1.3 max on same band. BUT swr is not a big problem (usually hams magnify that problem) i am couriouse, since i have my Rohde Schwarz CMS54 here, i can try to generate some low power signal and to do measurements with co-co and some simple 1/4 element to see difference. BUT, is there anything that i am doing wrong? any tips? As you can see below, there are two links for antennas that i made... maybe i did something wrong? If anyone can help me, i can upload some pictures of mine antennas to see what problem is... Thanks in advance! - Originalna poruka - Posiljalac: Peter Dakota Summerhawk [EMAIL PROTECTED] Datum: Cetvrtak, Jul 31, 2008 8:58 Tema: RE: [Repeater-Builder] Re: UHF antenna Primalac: Repeater-Builder@yahoogroups.com A real simple test I had for deaf antenna: this was on 2M so I stripped a section of coax off eh end to form a 1/4 wave antenna and connected it to the original run of coax to make sure I could be heard with a few short tests. Turns out it was the antenna in the end and not the coax like I thought. Might give it a try and see if that doesn't work for you in a pinch. That way you know if it's the antenna or another problem. Just throwing out ideas. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Milan Pavlica Sent: Wednesday, July 30, 2008 8:32 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: UHF antenna Is it possible that no one have pictures of its home made antennas? As i wrote, i have a problem with sensitivity, think that antenna is deaf. Will try to compare with Celwave antenna and RohdeSchwarz CMS54 test-set as receiver to see differences Please help me... TNX in advance! --- In Repeater-Builder@yahoogroups.com, Milan Pavlica [EMAIL PROTECTED] wrote: Hello! I made UHF coax collinear antenna, two version, one is from http://www.repeater-builder.com/antenna/wa6svt.html and second is from http://www.para.org.ph/membersarticles/DU1ANV/VHF%20Collinear%20Antennas.htm in both cases i can get good SWR but i am not so sure did i made it OK (have a feel that it is deaf on receive) I am asking, if anyone played with this stuffs (i made 4elements, for start only with RG58), maybe with some tips and pictures, just to see am i doing something wrong THANKS IN ADVANCE! Not to disturb list, please use private mail. THANKS AGAIN! YU7XW Yahoo! Groups Links Yahoo! Groups Links mailto:Repeater-Builder- [EMAIL PROTECTED]
[Repeater-Builder] Re: Height Gain figure
To not always I'd add: *almost never*. Laryn K8TVZ --- In Repeater-Builder@yahoogroups.com, Barry [EMAIL PROTECTED] wrote: Not always To: Repeater-Builder@yahoogroups.com From: [EMAIL PROTECTED] Date: Sun, 10 Aug 2008 23:19:52 -0500 Subject: RE: [Repeater-Builder] Height Gain figure So if the antenna is already at 1000 feet height and it is moved up another 100 feet to 1100 feet, you are going to increase the range by 14 miles?? 73 Gary K4FMX From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, August 10, 2008 3:20 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Height Gain figure It is interesting to see the many responses, none of which I have problems with, but all seem to skirt your question. If you are moving the site any distance from the present site, then it is very true that these variables must be considered. If you are moving only a very short distance from your current site, then, I believe what you are looking for is a simple formula to givr a close guess of what to expect. I think you will find that should yout take the square root of the change in height, in this case, the square root of 100 which is 10, and mulitply that by the square root of 2, which is 1.414, you will come up with an approximattion of 14 or so miles improvement. Again, as others have pointed out, many variables inter into the equasion, but then, the bumble bee can not fly either. . . .. Hope this helps. 73 and cheers, Gene, W4FWG -- Original message from Chuck Kimball [EMAIL PROTECTED]: -- At one point I had read a number for figuring out the gain you get by increasing the height. Of course at the moment I'm unable to locate that. ie: If I move the same antenna (VHF 2m) up a hill and gain 100' of elevation, but it costs me the line loss (300'), did I really gain anything. I'll figure in the line loss, and adjust the hardline to minimize the loss, but I'm looking for the number to compare how much gain (in db) did I get with the increased height. So... Anyone know what number is for gain as a function of height? or know a reference I can look up. Thanks Chuck n0nhj _ Meet singles near you. Try ninemsn dating now! http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fdating%2Eninemsn%2Ecom%2Eau%2Fchannel%2Findex%2Easpx%3Ftrackingid%3D1046247_t=773166080_r=WL_TAGLINE_m=EXT
Re: [Repeater-Builder] Height Gain figure
At 16:42 8/10/2008, Dick wrote: An antenna's gain is what it is and it doesn't change with elevation. I am assuming you mean elevation over the surrounding terrain?? This is not true. For example, a dipole has an energy distribution pattern that changes markedly with height above ground. Just try using a NVIS for DX! And verticals become ineffective at very high installation points unless special steps are taken to compensate (by improving the counterpoise). Anyway, that's my opinion and I'm stickin' to it. -- Dave Gomberg, San Francisco NE5EE gomberg1 at wcf dot com All addresses, phones, etc. at http://www.wcf.com/ham/info.html -
RE: [Repeater-Builder] Re: Genesis series bank charger question
At 18:47 8/10/2008, Eric Lemmon wrote: Albert, Don't bother calling Motorola Parts. I found the manual number for the NTN4668A: 6881106C66. Unfortunately, it has only recently been cancelled and is NLA. Bummer! Good news from Pacific Wireless Communications 800-327-1949 http://www.pwchi.com/parts_sale.htm 6881106C66 MULTI U CHGR INSTR MAN 2 avail3.77USD each -- Dave Gomberg, San Francisco NE5EE gomberg1 at wcf dot com All addresses, phones, etc. at http://www.wcf.com/ham/info.html -
[Repeater-Builder] Re: Genesis series bank charger question
Thank you all for the input. As always, I can trust that this group has a wealth of distributed knowledge. Allow me to respond to a few of your suggestinos and comments. I did look through my P200 Radius manual (don't have it handy or I would write down # of manual) and found a small section in the back describing the theory of opperation regarding the bank charger. There was also a schematic and expoded diagram. It was very enlightening. The six slot charger is much more complicated than I thought. I am glad I took digital circuits or else I would have been lost. Thank you Mike for your comments on Bob's article. I had a feeling that was the case. As I have researched, experiemented, and learned a little more I came to the same realization. Either you could modify the charger or modify the resistor and thermistor in the battery. I guess manufactures have finally picked up on that and begun to install different components in the packs. So, this raises another question. Monitoring battery temperature while charging. I guess the IR thermometer would be ok but I immagine the batteries inside the shell would be a bit hotter than the outside of the case. What would be a better way of monitoring battery temperature in order to determine if the battery was charging properly or not? I guess I will leave the charger alone for now since the circuitry seems different enough from the desktop fast charger that the same modifications can't be made. Also, as stated above, the modifications may not be necessary at all. Thanks as always. Albert KI4ORI --- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ [EMAIL PROTECTED] wrote: At 04:14 PM 08/10/08, you wrote: Hey guys, I am back with yet another Motorola Genesis series question. I have acquired a 6 slot bank charger and would like to convert it over to handle NiMH batteries. I have done both my stand alone fast chargers and my MVA, but not the bank charger, but I immagine it shares at least some similarities with the others. I was wondering if anyone would mind offering guidance? Thanks. Note that the mod listed in Bob's article was required because of the different thermal response of the NIMH cell chemistry, and the fact that the manufacturer of the particular batteries Bob received used the thermistor intended for NICDs. Different manufacturers may use different thermistors. In some cases no mod may be needed. At one time the local Radio Shack had their hand-held remote IR Thermal readout device for $20. I wish I had purchased one then, but by the time I heard about it they were out of stock. See http://www.radioshack.com/product/index.jsp?productId=2460852 One of these would making the measurments mentioned in Bob's article very easy. Mike WA6ILQ
[Repeater-Builder] ACC RC-85 / Kenwood TS-440S Remote Base Questions
I have a UHF Repeater using an ACC RC-85 repeater controller, which also controls a Kenwood TS-440 HF Transceiver as the Remote Base radio. All the HF Radio control commands seem to work fine, except the Bump Down 500 Hz command. The command is [Remote Base Prefix] 7 - it just has no reponse. But the Bump UP 500 Hz and the other Bump Up/Down - 20 Hz and 100 Hz step commands work just fine. It's not a problem decoding the 7 - the Touchtone Pad Test reads back all digits correctly. The touchtone decoder in the RC-85 seems to work extremely well and decodes noisy signals without falsing. I can be mobile, using just a handheld radio that's choppy into the repeater, and dial around on the HF radio with hardly ever having a missed digit. The other minor problem I'm having is that the transmit audio for the TS-440S is so hot coming from the RC-85 that it's unusable. The output of the RC-85 transmit audio is fixed level, and is controlled by the inputs from the receiver (in this case, the UHF repeater receiver.) If I turn down the level of the receive audio to the controller so that the TS-440 transmit audio is at the proper level, then the controller doesn't have enough audio output to drive the main UHF transmitter to more than about 2 kHz deviation. I'm feeding the transmit audio into the TS-440's AFSK IN rear-panel jack, as suggested in the RC-85 manual. Using this input, the TS-440 front-panel mic gain control has no effect on the transmit audio level from the AFSK IN jack. Looking at the RC-85 manual and in an old issue of ACC Notes which describes RC-850 and RC-85 transmit audio level setting procedures, it suggests padding down the output of the transmit audio using an attenuator or resistive voltage divider. Anyone tried this and have any starting values? Lots of fun! Larry K7LJ
RE: [Repeater-Builder] UHF MICOR Unified Chassis
More information about this project. I have the station working - receiving, decoding proper PL tone, repeating, transmitting audio, etc. The only thing it is NOT doing is encoding tone for transmit. (A reminder - this is a Community Repeater MICOR chassis, NOT the standard repeater chassis.) Anyway - from what I can tell, the Master Control module is NOT sending tone out to the modulator. The problem I have is this: the manual supplement I have shows a different Master Control module that what I have. My modules are not IC-based, the ones on the manual are. Therefore, I believe the schematic and operation for the module I have is completely different than that in the manual. Does anyone have an earlier issue of the Community Repeater manual - 68P81025E55 (probably revision A, since mine is a B)? *ALL* I think I need are the pages pertaining to the Master Control Module - part #TLN5803A. (Other part numbers may be: TLN8780A or TLN1684A - these are numbers stamped on the flange of the card - the first number above was printed right on the circuit board.) The module referenced in my manual is TRN6165A. For those with a manual - I am seeing tone at Pin 7 (Tone PL Out) but not at Pin 2 (Tone or Binary PL to Modulator) on the Master Control module. I tried merely jumpering Pin 7 to Pin 2 - doesn't work. Because the schematic and board layout is completely different, I have no reference to be able to chase signal through the circuit. I'm also wondering if a required jumper is missing or a jumper is improperly installed on my Master Control card. Thanks! Mark - N9WYS
[Repeater-Builder] Re: Registered Sex Offenders
The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T www.riflesandradios.com
Re: [Repeater-Builder] Height Gain figure
I've seen several instances where doubling the antenna hight typically adds about 20 percent more coverage over normal terrain. Of course this has it's limits since the earth hasn't been flat for many hundreds of years. I once saw a SMR operator spend about 100K to go from 200 feet to 450 feet with his system. He stated he was expecting to double his coverage. In reality it only added about 5 miles to his previous 20 mile coverage. He sure was disappointed. Dex
Re: [Repeater-Builder] Re: Genesis series bank charger question
Yes, the IR thermometer will show a lower temp on the outside of the case than the cells are actually experiencing. However, it won't be too far off, and since the charger stops the rapid charge cycle at about 104 degrees Fahrenheit, a few more degrees one way or the other won't really make much of a difference. The temperature rise is also fairly slow, as in several minutes per degree even when the battery finally reaches full charge, so the thermal lag is minimal, even though the plastic doesn't transfer the internal cell temp very well. Bob M. == --- On Mon, 8/11/08, Albert [EMAIL PROTECTED] wrote: From: Albert [EMAIL PROTECTED] Subject: [Repeater-Builder] Re: Genesis series bank charger question To: Repeater-Builder@yahoogroups.com Date: Monday, August 11, 2008, 10:04 AM Thank you all for the input. As always, I can trust that this group has a wealth of distributed knowledge. Allow me to respond to a few of your suggestinos and comments. I did look through my P200 Radius manual (don't have it handy or I would write down # of manual) and found a small section in the back describing the theory of opperation regarding the bank charger. There was also a schematic and expoded diagram. It was very enlightening. The six slot charger is much more complicated than I thought. I am glad I took digital circuits or else I would have been lost. Thank you Mike for your comments on Bob's article. I had a feeling that was the case. As I have researched, experiemented, and learned a little more I came to the same realization. Either you could modify the charger or modify the resistor and thermistor in the battery. I guess manufactures have finally picked up on that and begun to install different components in the packs. So, this raises another question. Monitoring battery temperature while charging. I guess the IR thermometer would be ok but I immagine the batteries inside the shell would be a bit hotter than the outside of the case. What would be a better way of monitoring battery temperature in order to determine if the battery was charging properly or not? I guess I will leave the charger alone for now since the circuitry seems different enough from the desktop fast charger that the same modifications can't be made. Also, as stated above, the modifications may not be necessary at all. Thanks as always. Albert KI4ORI --- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ [EMAIL PROTECTED] wrote: At 04:14 PM 08/10/08, you wrote: Hey guys, I am back with yet another Motorola Genesis series question. I have acquired a 6 slot bank charger and would like to convert it over to handle NiMH batteries. I have done both my stand alone fast chargers and my MVA, but not the bank charger, but I immagine it shares at least some similarities with the others. I was wondering if anyone would mind offering guidance? Thanks. Note that the mod listed in Bob's article was required because of the different thermal response of the NIMH cell chemistry, and the fact that the manufacturer of the particular batteries Bob received used the thermistor intended for NICDs. Different manufacturers may use different thermistors. In some cases no mod may be needed. At one time the local Radio Shack had their hand-held remote IR Thermal readout device for $20. I wish I had purchased one then, but by the time I heard about it they were out of stock. See http://www.radioshack.com/product/index.jsp?productId=2460852 One of these would making the measurments mentioned in Bob's article very easy. Mike WA6ILQ
[Repeater-Builder] Micor Power Supply
I recently received a Micor repeater power supply from an SK and was wondering if there are any schematics available for it? The model number is TPN 1217B. Thanks Ken WB6MMV
[Repeater-Builder] EF Johnson portable conversion to ham
I acquired a pair of EF Johnson Viking CK 8571 (intrinsically safe) series portable radios. These are in the 900 MHz band, and I'd like to try to convert them to ham use - unless this would be an exercise in futility. The manual was available online, and after some reading I see that Johnson programs their radio frequencies via a Channel Number list rather than by actual frequency. So before I plunk down money for a RIB, cable and software, I'm wondering if anyone has tried to do something similar before? For example, would one need to hack the channel number list to make this thing work, or are the appropriate frequencies available in the channel number list? (I thought I read where some of the Kenwood radios operated this way.) I guess I don't have enough projects going on without starting this. hehehehe But the radios were given to me, so I figured I'd give it a shot.
Re: [Repeater-Builder] Re: Registered Sex Offenders
No Paul, a blanket statement like that is wrong. The owner of a repeater was wide latitude, but not complete. Try banning people of a certain race from a repeater, and see what happens. The owner of the repeater is not going to do well. --STeve Andre' wb8wsf en82 On Monday 11 August 2008 13:04:43 Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T
Re: [Repeater-Builder] Re: Registered Sex Offenders
In the USA, anyone can sue anyone at any time for any reason. They don't have to even have a valid case to file a suit. Granted, it won't 'go far', and they will most likely lose (unless you get a judge who likes to make law rather than interpret it), but they can still file against you. So, while you are correct about the fact that under FCC rules you can restrict anyone from using your station, he is correct that they can file suit even though you're completely in the right. In fact, it's more likely your FRRL could get sued for holding meetings at a location that is inaccessible by the offender. It would seem to be the same basis as the handicapped have used for years to successfully sue places that were not accessible to them, and while you can legally prevent someone from using your transmitter, there is less grounds for excluding someone from a social club such as the FRRL. While I can sympathize with your situation, read the first line of this post. Personally, I've only banned one person from my repeaters, and it was because they willfully interfered with other operators (and were cited by the FCC for doing so). Joe M. Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T www.riflesandradios.com Yahoo! Groups Links
Re: [Repeater-Builder] Re: Registered Sex Offenders - CLOSED
OK. I thought that the requests from a few members would have sufficed to close this thread. Apparently you guys don't play well at the policing yourselves game after all. So AS MODERATOR AND LIST OWNER - THIS THREAD IS NOW CLOSED! Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Rd Boswell, PA 15531 - Original Message - From: MCH [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, August 11, 2008 3:58 PM Subject: Re: [Repeater-Builder] Re: Registered Sex Offenders In the USA, anyone can sue anyone at any time for any reason. They don't have to even have a valid case to file a suit. Granted, it won't 'go far', and they will most likely lose (unless you get a judge who likes to make law rather than interpret it), but they can still file against you. So, while you are correct about the fact that under FCC rules you can restrict anyone from using your station, he is correct that they can file suit even though you're completely in the right. In fact, it's more likely your FRRL could get sued for holding meetings at a location that is inaccessible by the offender. It would seem to be the same basis as the handicapped have used for years to successfully sue places that were not accessible to them, and while you can legally prevent someone from using your transmitter, there is less grounds for excluding someone from a social club such as the FRRL. While I can sympathize with your situation, read the first line of this post. Personally, I've only banned one person from my repeaters, and it was because they willfully interfered with other operators (and were cited by the FCC for doing so). Joe M. Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T www.riflesandradios.com Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.138 / Virus Database: 270.6.0/1604 - Release Date: 8/11/2008 5:50 AM
Re: [Repeater-Builder] Re: Registered Sex Offenders
That would be an interesting case. Does any group of people have the right to demand use of YOUR license and YOUR equipment? Remember - these are not public transmitters - they are private transmitters owned by you and the license is granted to you. As such, the FCC is on record as confirming that you can deny anyone use of your equipment and your license for ANY reason. Closed repeaters ARE legal. Can someone of some race (pick any - it doesn't matter which) come up and demand that you let them use your car? I don't see how that could hold up in any court. It's exactly the same thing - forced use of your property. Now, if they wanted to put up their own repeater and you tried to deny them that right, that is a completely different story. Joe M. STeve Andre' wrote: No Paul, a blanket statement like that is wrong. The owner of a repeater was wide latitude, but not complete. Try banning people of a certain race from a repeater, and see what happens. The owner of the repeater is not going to do well. --STeve Andre' wb8wsf en82 On Monday 11 August 2008 13:04:43 Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T Yahoo! Groups Links
[Repeater-Builder] Dual battery system
Hi again guys .I am looking at installing 2 batteries in a repeater and are installing 30amp schottky diodes . I have 2 80 watt panels feeding a 30 amp schottky bridge (one common to 2 diodes ) then onto 2 solar regulators each supplying a battery Panels -bridge regulator- battery--bridge --lvdrepeater +--regulator--battery--+ Then using another bridge to combine the batteries together to a low voltage disconnect to the maxon repeater Anyone have any suggestions on heat sinks or problems I might come across Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Dual battery system
Sorry guys .The picture didn't come out properly Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Re: Registered Sex Offenders
Steve You are of course quite right. Paul overstates the case for the latitude provided for repeater owners to control their repeaters. He fails to distinguish between operator behavior and ascribed operator status. Most certainly, you can exclude from a repeater, an operator who uses the repeater to expound on his or hers political or religious or cultural belief. So you could certainly exclude, for example, an evangelical from raving and ranting on the repeater but you could not exclude that person simply because he/she is an evangelical, absent any rhetoric articulating that persuasion. You could exclude an African American operator who ranted about black power, but absent the rhetoric, you certainly exclude him or her simply because he is black. Nor can you exclude anyone because of their religion, race, gender or their age. In no way can an FCC regulation preempt Federal anti-discrimination legislation. So much for any claim of unbridled discretion in running people off a repeater. The P97 rule that provides wide latitude for repeater control is a valuable tool but it should be applied evenhandedly and in any event, used as a last resort. When push comes to shove, controlling how a repeater is used, is much more defendable than controlling who uses it. Abusing this protective language will ultimately result in losing it. Yes, the repeaters are indeed private property. But the pairs are not private frequencies. Those frequencies were there long before your any repeater was. Arbitrary and capricious exclusion of repeater users who follow the repeater guidelines and are not behaving to the detriment of repeater operation, may well make some fact finder decide that your repeater is no longer operating in the general public interest. For example, it was not and is not the intent of P97 to support turning a repeater into a comm-channel for the exclusive use of the repeater owner and his main squeeze. Bruce K7IJ In a message dated 8/11/2008 1:39:53 P.M. Pacific Daylight Time, [EMAIL PROTECTED] writes: No Paul, a blanket statement like that is wrong. The owner of a repeater was wide latitude, but not complete. Try banning people of a certain race from a repeater, and see what happens. The owner of the repeater is not going to do well. --STeve Andre' wb8wsf en82 On Monday 11 August 2008 13:04:43 Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/ 443.02 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T **Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos. (http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut000517 )
Re: [Repeater-Builder] Re: Registered Sex Offenders
Can you people get your damn discussion off this repeater builder site. I'm interested in hearing about repeaters and directly associated problems NOT ABOUT SEX OFFENDERS. Allan Crites WA9ZZU MCH [EMAIL PROTECTED] wrote: That would be an interesting case. Does any group of people have the right to demand use of YOUR license and YOUR equipment? Remember - these are not public transmitters - they are private transmitters owned by you and the license is granted to you. As such, the FCC is on record as confirming that you can deny anyone use of your equipment and your license for ANY reason. Closed repeaters ARE legal. Can someone of some race (pick any - it doesn't matter which) come up and demand that you let them use your car? I don't see how that could hold up in any court. It's exactly the same thing - forced use of your property. Now, if they wanted to put up their own repeater and you tried to deny them that right, that is a completely different story. Joe M. STeve Andre' wrote: No Paul, a blanket statement like that is wrong. The owner of a repeater was wide latitude, but not complete. Try banning people of a certain race from a repeater, and see what happens. The owner of the repeater is not going to do well. --STeve Andre' wb8wsf en82 On Monday 11 August 2008 13:04:43 Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T Yahoo! Groups Links
Re: [Repeater-Builder] Re: Registered Sex Offenders
THANK YOU ALLAN! I GUESS SOME PEOPLE DON'T PAY ATTENTION TO LIST OWNER.
Re: [Repeater-Builder] ACC RC-85 / Kenwood TS-440S Remote Base Questions
Since you don't have control of the audio level anywhere else, I would suggest using a potentiometer as the attenuator. Hook the output of your remote base audio to both ends of the pot, and take the input to the TS-440 RCA jack from the center lead of the pot. Hook the ground end of the pot to the ground from the controller and to the ground on the RCA jack. A 10 K pot should give you all the control you need to set the levels. Typical convention is to let the clockwise rotation of the pot increase the level, so use the correct terminals on the pot to give this action. 73 - Jim W5ZIT --- On Mon, 8/11/08, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: From: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: [Repeater-Builder] ACC RC-85 / Kenwood TS-440S Remote Base Questions To: Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] Date: Monday, August 11, 2008, 11:17 AM I have a UHF Repeater using an ACC RC-85 repeater controller, which also controls a Kenwood TS-440 HF Transceiver as the Remote Base radio. All the HF Radio control commands seem to work fine, except the Bump Down 500 Hz command. The command is [Remote Base Prefix] 7 - it just has no reponse. But the Bump UP 500 Hz and the other Bump Up/Down - 20 Hz and 100 Hz step commands work just fine. It's not a problem decoding the 7 - the Touchtone Pad Test reads back all digits correctly. The touchtone decoder in the RC-85 seems to work extremely well and decodes noisy signals without falsing. I can be mobile, using just a handheld radio that's choppy into the repeater, and dial around on the HF radio with hardly ever having a missed digit. The other minor problem I'm having is that the transmit audio for the TS-440S is so hot coming from the RC-85 that it's unusable. The output of the RC-85 transmit audio is fixed level, and is controlled by the inputs from the receiver (in this case, the UHF repeater receiver.) If I turn down the level of the receive audio to the controller so that the TS-440 transmit audio is at the proper level, then the controller doesn't have enough audio output to drive the main UHF transmitter to more than about 2 kHz deviation. I'm feeding the transmit audio into the TS-440's AFSK IN rear-panel jack, as suggested in the RC-85 manual. Using this input, the TS-440 front-panel mic gain control has no effect on the transmit audio level from the AFSK IN jack. Looking at the RC-85 manual and in an old issue of ACC Notes which describes RC-850 and RC-85 transmit audio level setting procedures, it suggests padding down the output of the transmit audio using an attenuator or resistive voltage divider. Anyone tried this and have any starting values? Lots of fun! Larry K7LJ __.__
[Repeater-Builder] DB Product 4 Bay Antenna
,_._, A recent storm damaged my repeater Ant 444.750 it was made By Antenex FG-4505 5 db Gain, They tuned to Xmit Freq. I also have a G-6 that was hit By Lightning that I could Repair. But in the Rafters of the garage I found a Ant I must of bought a long time ago at a Hamfest it is a DB Product TDE-7260 4 Bay 450-470 Mhz My question would the DB Product which of course is made very well , Perform as well or betters then the 2 Above at the same Height, Coax and SWR , I did look around in the Group Messages and found info on the 2 Meter DB Brand but not the 440 Thanks Don KA9QJG __
[Repeater-Builder] Low Band Base Antenna Info Wanted
Hello to the Group, Does anyone have any information or a cutting chart for the following antenna? I have one and would like to put it into service on 10 meters. It was given to me without any info or radials. It is definitely used but appears to be intact. A quick web search turned up nothing. Sticker Info on antenna: Antenna Specialists Dallas TX 75247-6780 ASPA 2010 30-40 MHz 9209508 Serial x-x It looks like a commercial version of a CB base antenna. The vertical radiator is a series of telescoping aluminum tubing pieces held in place with hose clamps. Maximum extended length of the vertical element is approximately 21 feet. Minimum contracted length is approximately 5 feet. The antenna uses 4 radials and the radial clamps appear to accept 5/16 inch rods. (I'm not sure if the radials are supposed to stick out straight or droop at some desired angle.) If nobody has any info, does the following tuneup procedure seem correct? 1. Cut a set of radials for 1/4 wL at 35 MHz. 2. Adjust the vertical radiator for best SWR within 30-40 MHz. 3. Measure and record vertical element, radial lengths, and frequency. 4. Scale recorded dimensions to the desired 10 meter frequency. Thanks and 73, Mark, N2MH
RE: [Repeater-Builder] DB Product 4 Bay Antenna
Don, I'd think it's broadbanded enough to be able to work well at 444. The antenna I have on my 444.5500 repeater (although supposedly tuned to the ham band) is actually a 450 - 470 MHz, 4-bay dipole itself. and it does VERY well, even with the modified phasing harness. Mark - N9WYS From: Repeater-Builder@yahoogroups.com On Behalf Of ka9qjg ,_._, A recent storm damaged my repeater Ant 444.750 it was made By Antenex FG-4505 5 db Gain, They tuned to Xmit Freq. I also have a G-6 that was hit By Lightning that I could Repair. But in the Rafters of the garage I found a Ant I must of bought a long time ago at a Hamfest it is a DB Product TDE-7260 4 Bay 450-470 Mhz My question would the DB Product which of course is made very well , Perform as well or betters then the 2 Above at the same Height, Coax and SWR , I did look around in the Group Messages and found info on the 2 Meter DB Brand but not the 440 Thanks Don KA9QJG
RE: [Repeater-Builder] Re: Registered Sex Offenders
In addition, the defendant will very likely be bankrupted from the legal fees required to defend himself from such lawsuit, valid or not, so it's a small consolation that the suit was frivolous. Richard http://www.n7tgb.net/ www.n7tgb.net _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of MCH Sent: Monday, August 11, 2008 12:59 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Registered Sex Offenders In the USA, anyone can sue anyone at any time for any reason. They don't have to even have a valid case to file a suit. Granted, it won't 'go far', and they will most likely lose (unless you get a judge who likes to make law rather than interpret it), but they can still file against you. So, while you are correct about the fact that under FCC rules you can restrict anyone from using your station, he is correct that they can file suit even though you're completely in the right. In fact, it's more likely your FRRL could get sued for holding meetings at a location that is inaccessible by the offender. It would seem to be the same basis as the handicapped have used for years to successfully sue places that were not accessible to them, and while you can legally prevent someone from using your transmitter, there is less grounds for excluding someone from a social club such as the FRRL. While I can sympathize with your situation, read the first line of this post. Personally, I've only banned one person from my repeaters, and it was because they willfully interfered with other operators (and were cited by the FCC for doing so). Joe M. Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T www.riflesandradios.com Yahoo! Groups Links
RE: [Repeater-Builder] Re: Registered Sex Offenders - CLOSED
Oops! Sorry for my last post, didn't see this in time. Richard http://www.n7tgb.net/ www.n7tgb.net _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Scott Zimmerman Sent: Monday, August 11, 2008 2:04 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Registered Sex Offenders - CLOSED OK. I thought that the requests from a few members would have sufficed to close this thread. Apparently you guys don't play well at the policing yourselves game after all. So AS MODERATOR AND LIST OWNER - THIS THREAD IS NOW CLOSED! Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Rd Boswell, PA 15531 - Original Message - From: MCH [EMAIL PROTECTED] mailto:mch%40nb.net To: Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com Sent: Monday, August 11, 2008 3:58 PM Subject: Re: [Repeater-Builder] Re: Registered Sex Offenders In the USA, anyone can sue anyone at any time for any reason. They don't have to even have a valid case to file a suit. Granted, it won't 'go far', and they will most likely lose (unless you get a judge who likes to make law rather than interpret it), but they can still file against you. So, while you are correct about the fact that under FCC rules you can restrict anyone from using your station, he is correct that they can file suit even though you're completely in the right. In fact, it's more likely your FRRL could get sued for holding meetings at a location that is inaccessible by the offender. It would seem to be the same basis as the handicapped have used for years to successfully sue places that were not accessible to them, and while you can legally prevent someone from using your transmitter, there is less grounds for excluding someone from a social club such as the FRRL. While I can sympathize with your situation, read the first line of this post. Personally, I've only banned one person from my repeaters, and it was because they willfully interfered with other operators (and were cited by the FCC for doing so). Joe M. Paul Dumdie wrote: The gentleman who says that you will end up on the wrong side of a lawsuit is just plain wrong. The repeater trustee may limit access by licensed amateurs to a repeater for any reason - any at all AND the is no recourse by the excluded amateur. Since the FRRL Aurora IL has families with children and minors who are amateurs we exclude all sex offenders from our membership. Also -we hold meetings in public places known under Illinois law as safe zones from which sex offenders are excluded; they cannot be full voting members. Again, the gentleman who mentioned lawsuits is completely blowing smoke - the banned amateur excluded from repeater access has no legal standing - period - end of story Paul R. Dumdie Jr. 73 W9DWP/R IRLP-NODE-4455 443.025/2A 145.270/1B/1Z/NAC-293 ARC-Radio-8 KCARES HERD546 EX WB9QWZ WQGG738 AAR5CU/T www.riflesandradios.com Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - http://www.avg. http://www.avg.com com Version: 8.0.138 / Virus Database: 270.6.0/1604 - Release Date: 8/11/2008 5:50 AM
RE: [Repeater-Builder] DB Product 4 Bay Antenna
Don, TDE-7260 looks like a Motorola part number, probably assigned to an off-the-shelf antenna from DB, maybe a DB404 or DB411. If so then it should work fine down to 444Mhz with little or no adjustment. Gary R. N6LRV _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of ka9qjg Sent: Monday, August 11, 2008 5:00 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] DB Product 4 Bay Antenna ,_._, A recent storm damaged my repeater Ant 444.750 it was made By Antenex FG-4505 5 db Gain, They tuned to Xmit Freq. I also have a G-6 that was hit By Lightning that I could Repair. But in the Rafters of the garage I found a Ant I must of bought a long time ago at a Hamfest it is a DB Product TDE-7260 4 Bay 450-470 Mhz My question would the DB Product which of course is made very well , Perform as well or betters then the 2 Above at the same Height, Coax and SWR , I did look around in the Group Messages and found info on the 2 Meter DB Brand but not the 440 Thanks Don KA9QJG __
[Repeater-Builder] Re: Low Band Base Antenna Info Wanted
Hi Mark... How about you save some aluminum tubing by not cutting the radials too short for 10 meterscut 4 radials about 1/4 wavelength or so for your mid-band 10 meter frequency...start with maximum vertical antenna length and slide the tubing into each other to get your lowest SWR. If your SWR goes up as you compress from maximum length, you need to lengthen one of the vertical tubes. Cheaper, faster. saves energy... LW --- In Repeater-Builder@yahoogroups.com, mark_n2mh [EMAIL PROTECTED] wrote: Hello to the Group, Does anyone have any information or a cutting chart for the following antenna? I have one and would like to put it into service on 10 meters. It was given to me without any info or radials. It is definitely used but appears to be intact. A quick web search turned up nothing. Sticker Info on antenna: Antenna Specialists Dallas TX 75247-6780 ASPA 2010 30-40 MHz 9209508 Serial x-x It looks like a commercial version of a CB base antenna. The vertical radiator is a series of telescoping aluminum tubing pieces held in place with hose clamps. Maximum extended length of the vertical element is approximately 21 feet. Minimum contracted length is approximately 5 feet. The antenna uses 4 radials and the radial clamps appear to accept 5/16 inch rods. (I'm not sure if the radials are supposed to stick out straight or droop at some desired angle.) If nobody has any info, does the following tuneup procedure seem correct? 1. Cut a set of radials for 1/4 wL at 35 MHz. 2. Adjust the vertical radiator for best SWR within 30-40 MHz. 3. Measure and record vertical element, radial lengths, and frequency. 4. Scale recorded dimensions to the desired 10 meter frequency. Thanks and 73, Mark, N2MH
Re: [Repeater-Builder] DB Product 4 Bay Antenna
Hey N9EX here I have one of those on my repeater don't have the model number ,I got mine used. the 4 bay is 6db gain, and dc grounded so lighting is not suppose to hurt the antenna. mine works great Jack N9ex In a message dated 8/11/2008 7:00:50 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: ,_._, A recent storm damaged my repeater Ant 444.750 it was made By Antenex FG-4505 5 db Gain, They tuned to Xmit Freq. I also have a G-6 that was hit By Lightning that I could Repair. But in the Rafters of the garage I found a Ant I must of bought a long time ago at a Hamfest it is a DB Product TDE-7260 4 Bay 450-470 Mhz My question would the DB Product which of course is made very well , Perform as well or betters then the 2 Above at the same Height, Coax and SWR , I did look around in the Group Messages and found info on the 2 Meter DB Brand but not the 440 Thanks Don KA9QJG __ **Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos. (http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut000517 )
RE: [Repeater-Builder] Height Gain figure
My reply was strictly tongue in cheek as to the amount of range increase that would be obtained. As the other poster claimed that adding 100 feet to some unknown antenna height would yield an additional 14 miles range. Free space loss is not going to be a factor in a normal repeater system. Unless of course you are starting out with microwatts of power. After all you only loose 6 db every time you double the distance in free space. There are many other factors that will cause attenuation of the signal that will dominate free space loss. 73 Gary K4FMX -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of Eric Lemmon Sent: Sunday, August 10, 2008 11:42 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Height Gain figure Probably not. The range of any repeater or base station is limited by the ability to receive a signal from the units in the field, not by the amount of power at the base or repeater station. At some point, the free-space losses will prevent the unit in the field from getting a usable signal into the base station- even if there is a line-of-sight path. This doesn't happen very often, due to the curvature of the earth, but it is a physical barrier that exists. We often assume that a line-of-sight path is a guarantee of solid communications, but it doesn't work that way. After all, you can't use a handie-talkie on the moon to talk through a repeater on Earth, even though you might have a clear line-of-sight path. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Gary Schafer Sent: Sunday, August 10, 2008 9:20 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Height Gain figure So if the antenna is already at 1000 feet height and it is moved up another 100 feet to 1100 feet, you are going to increase the range by 14 miles?? 73 Gary K4FMX From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, August 10, 2008 3:20 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Height Gain figure It is interesting to see the many responses, none of which I have problems with, but all seem to skirt your question. If you are moving the site any distance from the present site, then it is very true that these variables must be considered. If you are moving only a very short distance from your current site, then, I believe what you are looking for is a simple formula to givr a close guess of what to expect. I think you will find that should yout take the square root of the change in height, in this case, the square root of 100 which is 10, and mulitply that by the square root of 2, which is 1.414, you will come up with an approximattion of 14 or so miles improvement. Again, as others have pointed out, many variables inter into the equasion, but then, the bumble bee can not fly either. . . .. Hope this helps. 73 and cheers, Gene, W4FWG -- Original message from Chuck Kimball [EMAIL PROTECTED]: -- At one point I had read a number for figuring out the gain you get by increasing the height. Of course at the moment I'm unable to locate that. ie: If I move the same antenna (VHF 2m) up a hill and gain 100' of elevation, but it costs me the line loss (300'), did I really gain anything. I'll figure in the line loss, and adjust the hardline to minimize the loss, but I'm looking for the number to compare how much gain (in db) did I get with the increased height. So... Anyone know what number is for gain as a function of height? or know a reference I can look up. Thanks Chuck n0nhj Yahoo! Groups Links
RE: [Repeater-Builder] Height Gain figure
-Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of Dave Gomberg Sent: Monday, August 11, 2008 8:37 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Height Gain figure At 16:42 8/10/2008, Dick wrote: An antenna's gain is what it is and it doesn't change with elevation. I am assuming you mean elevation over the surrounding terrain?? This is not true. For example, a dipole has an energy distribution pattern that changes markedly with height above ground. Just try using a NVIS for DX! And verticals become ineffective at very high installation points unless special steps are taken to compensate (by improving the counterpoise). Anyway, that's my opinion and I'm stickin' to it. Once the antenna is several wavelengths above ground (as it will be with any reasonable height at VHF and above) the pattern is going to be the same no matter how much higher it is raised. The ground will have insignificant effects on the radiation pattern. 73 Gary K4FMX
RE: [Repeater-Builder] Micor Power Supply
Ken, The information you seek is contained in the Power Supply Service Manual, publication 6881094E30, which is available from Motorola Parts for about $19. Call 800-422-4210 to place an order. This is an extremely valuable reference manual, and once the existing stock is depleted it probably will be NLA. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of wb6mmv Sent: Monday, August 11, 2008 8:06 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Micor Power Supply I recently received a Micor repeater power supply from an SK and was wondering if there are any schematics available for it? The model number is TPN 1217B. Thanks Ken WB6MMV
Re: [Repeater-Builder] Low Band Base Antenna Info Wanted
Hi Mark, According to my old Antenna Specialist catalog, what you have is a MINI-PAK series, half-wavelength, economy base station antenna. The photo shows the radials coming straight out, but I would guess there would be some drooping due to their weight. Here's some info on the ASPA2010 Frequency Range: 30 to 40 MHz Power: 500 watts maximum Gain: Unity Bandwidth: 2% of operating frequency Beamwidth: 75 degrees Matching Coil: dc grounded PVC jacket Feedpoint Impedance: 50 ohms VSWR: 1.5:1 Rated Wind Velocity: 67 MPH To use this antenna on 10 meters you may have to ADD length to the radials, not cut them. And you may have to add length to the vertical antenna portion as well in order to get it to resonate on 10 meters. If you shorten the antenna element and radials, it would work fine on 6 meters. FYI, their ASPB2010 product covered the range from 40 to 50 MHz. I don't have the instruction manual or cutting chart. What I would do is leave the radials alone and adjust the antenna for the longest possible length. Then hook it to a transmitter through an SWR meter and take some readings at various frequencies like 29.6, 29.3, 29.2, and 29.0. Based on that you can tell if the antenna element is too long or too short and go from there. If you luck out, the SWR will be acceptable. If the SWR gets higher as the frequency gets lower, then you'll have to figure out a way to lengthen the element and radials and try again. 73 and Good Luck! Eric KH6CQ --- On Mon, 8/11/08, mark_n2mh [EMAIL PROTECTED] wrote: From: mark_n2mh [EMAIL PROTECTED] Subject: [Repeater-Builder] Low Band Base Antenna Info Wanted To: Repeater-Builder@yahoogroups.com Date: Monday, August 11, 2008, 2:57 PM Hello to the Group, Does anyone have any information or a cutting chart for the following antenna? I have one and would like to put it into service on 10 meters. It was given to me without any info or radials. It is definitely used but appears to be intact. A quick web search turned up nothing. Sticker Info on antenna: Antenna Specialists Dallas TX 75247-6780 ASPA 2010 30-40 MHz 9209508 Serial x-x It looks like a commercial version of a CB base antenna. The vertical radiator is a series of telescoping aluminum tubing pieces held in place with hose clamps. Maximum extended length of the vertical element is approximately 21 feet. Minimum contracted length is approximately 5 feet. The antenna uses 4 radials and the radial clamps appear to accept 5/16 inch rods. (I'm not sure if the radials are supposed to stick out straight or droop at some desired angle.) If nobody has any info, does the following tuneup procedure seem correct? 1. Cut a set of radials for 1/4 wL at 35 MHz. 2. Adjust the vertical radiator for best SWR within 30-40 MHz. 3. Measure and record vertical element, radial lengths, and frequency. 4. Scale recorded dimensions to the desired 10 meter frequency. Thanks and 73, Mark, N2MH
[Repeater-Builder] Re: Registered Sex Offenders - CLOSED
--- In Repeater-Builder@yahoogroups.com, Scott Zimmerman [EMAIL PROTECTED] wrote: AS MODERATOR AND LIST OWNER - THIS THREAD IS NOW CLOSED! Thank You Scott N3XCC!!! I tried my best to figure what the topic had to do with repeater design and construction. I am so GLAD this thread is now over! Learn something Guys-n-Gals here on the Repeater-Builder Yahoo group. The list in my understanding was created to discuss and chat about repeaters from a technical standpoint. Since 1979 when I designed and built my first Amateur Radio repeater system [on 2-meters]. I was a so called newbie back then. It took several years [20+] and all manner of projects to better educate myself on the where-with-all in repeater construction, not to mention the headaches with desense, calibration and keeping the PA stages as cool as possible! So again folks PLEASE try and keep this list as civilized and informative as possible. After all, we ALL are here to learn and share informationyes? 73 Doug Fitts W7FDF Vail, Arizona U.S.A.
