[Repeater-Builder] Re: GE MASTR II
Dave no trays but have the big power plugs for mastr ii i beleive. Problem is I'm mobile for 2 wks., if still required, pls. contact me then Jerry VE3 EXT
Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s)
Actually, they will have to replace all the mikes with TT mikes. Given the cost of the new mikes and special equipment at the electric gates, etc, it would be a lot cheaper to go with the garage door opener style system. Maybe I'll work up an estimate of what they might spent for both systems and the economics might help them make a better choice. joe -- Original message -- From: Dick [EMAIL PROTECTED] They already own the radios, they already have the freq, no new in-vehicle gear needed and no training to speak of. Dick - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 15:22 Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) They rejected this idea. They want to use the company radios, for some reason that I can't figure out. Joe -- Original message -- From: Chuck Kelsey [EMAIL PROTECTED] It'll be much more secure than broadcasting tones over the company frequency where someone could be listening. Also, the garage door openers are short range so that there's less chance of an accidental unlocking. Chuck - Original Message - From: Dick [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 5:47 PM Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Good idea, Chuck. Sorry I didn't think of that. Keep it simple. 73, Dick W1NMZ - Original Message - From: Chuck Kelsey To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 13:23 Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Why not just use a garage door opener radio? Chuck WB2EDV - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 4:03 PM Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike ---BeginMessage--- They already own the radios, they already have the freq, no new in-vehicle gear needed and no training to speak of. Dick - Original Message - From: [EMAIL PROTECTED]net To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 15:22 Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) They rejected this idea. They want to use the company radios, for some reason that I can't figure out. Joe -- Original message -- From: Chuck Kelsey [EMAIL PROTECTED]com It'll be much more secure than broadcasting tones over the company frequency where someone could be listening. Also, the garage door openers are short range so that there's less chance of an accidental unlocking. Chuck - Original Message - From: Dick [EMAIL PROTECTED]com To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 5:47 PM Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Good idea, Chuck. Sorry I didn't think of that. Keep it simple. 73, Dick W1NMZ - Original Message - From: Chuck Kelsey To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 13:23 Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Why not just use a garage door opener radio? Chuck WB2EDV - Original Message - From: [EMAIL PROTECTED]net To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 4:03 PM Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a
[Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s)
Joe, I can sell you something that will do this using DTMF. Might contact me off line at [EMAIL PROTECTED] Don't want to spray the board with ads. As someone else noted a different CTCSS tone set on a different user's radio channel could be used. Only need a CTCSS decoder, TS64DS, but would have to program the radios. If only few need access to the gate would be easy. If they all do not have DTMF mikes then CTCSS would be cheaper. 73, ron, n9ee/r --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike
[Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s)
Joe, Doing it on the repeater or base freq would allow other users to open the gate if one did not have the code. I like the garage door approach, but having longer range has it advantages and of course disadvantages. I should ask, do the users now have DTMF mikes. These are not cheap, but easy to install. 73, ron, n9ee/r --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: But, if I did this, it would not be an off the shelf product and I would end up being the support repair for the units. There may be several of them. They want to use the talk around frequency to activate the gate. joe -- Original message -- From: Dick [EMAIL PROTECTED] Joe: Probably one of the cheapoest ways to do this would be to get an el cheapo rptr controller and connect it to a VHF rcvr. The company can then buy DTMF mikes for their radios. If it were me, I'd set up a separate VHF freq or the same freq with a different PL for the gate actuator. I prefer the seprate freq so they won't broadcast the gate actuator code all over the world. 73, Dick W1NMZ - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 13:03 Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike
[Repeater-Builder] D-Star demo
hi all, In the FILES section of this board is a Weak Sig D-Star demon by WB9WZB. Most impressive test. Can anyone give details of the test...was same rig with power levels and antennas used in the test??? 73, ron, n9ee/r
RE: [Repeater-Builder] D-Star demo
Not sure about the radios, but this echoes what we found in Dayton last weekend. We were running U82's all weekend, And Saturday myself and N0EUH were back at the hotel just up the street from Smokey Bones and right next to I75 One of our crew called us on low power simplex, and it sounded like he was right next to us. He was in the flea market at Hara. I was really impressed. It was crystal clear. Chuck K0XM -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wright, Skywarn Coodinator Sent: Sunday, May 27, 2007 9:48 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] D-Star demo hi all, In the FILES section of this board is a Weak Sig D-Star demon by WB9WZB. Most impressive test. Can anyone give details of the test...was same rig with power levels and antennas used in the test??? 73, ron, n9ee/r Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.0/819 - Release Date: 5/26/2007 10:47 AM No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.0/819 - Release Date: 5/26/2007 10:47 AM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.0/819 - Release Date: 5/26/2007 10:47 AM Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s)
Are there plans on the web for using garage door systems to operate gates? Remember, the gate may have to be modified to work with the garage door opener. One can find similar systems at Home Improvement centers in the $500 - $1,000 range, depending upon the gate style. From a security viewpoint this would be the way to go. Using the company frequency even with a custom TT would compromise the integrity of the facility since an enemy could record and analyze the TT sequence. Jack - N7OO - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 27, 2007 6:37 AM Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Actually, they will have to replace all the mikes with TT mikes. Given the cost of the new mikes and special equipment at the electric gates, etc, it would be a lot cheaper to go with the garage door opener style system. Maybe I'll work up an estimate of what they might spent for both systems and the economics might help them make a better choice. joe -- Original message -- From: Dick [EMAIL PROTECTED] They already own the radios, they already have the freq, no new in-vehicle gear needed and no training to speak of. Dick - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 15:22 Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) They rejected this idea. They want to use the company radios, for some reason that I can't figure out. Joe -- Original message -- From: Chuck Kelsey [EMAIL PROTECTED] It'll be much more secure than broadcasting tones over the company frequency where someone could be listening. Also, the garage door openers are short range so that there's less chance of an accidental unlocking. Chuck - Original Message - From: Dick [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 5:47 PM Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Good idea, Chuck. Sorry I didn't think of that. Keep it simple. 73, Dick W1NMZ - Original Message - From: Chuck Kelsey To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 13:23 Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Why not just use a garage door opener radio? Chuck WB2EDV - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 4:03 PM Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike
RE: [Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s)
Hi Joe, If they swapped there radios for the Kenwood radios using Fleet Sync that would enable what your trying to do or just get a DTMF decoder and a radio at the garage door location and that would do as well. Mike -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wright, Skywarn Coodinator Sent: Sunday, May 27, 2007 6:28 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s) Joe, I can sell you something that will do this using DTMF. Might contact me off line at [EMAIL PROTECTED] mailto:mccrpt%40verizon.net net. Don't want to spray the board with ads. As someone else noted a different CTCSS tone set on a different user's radio channel could be used. Only need a CTCSS decoder, TS64DS, but would have to program the radios. If only few need access to the gate would be easy. If they all do not have DTMF mikes then CTCSS would be cheaper. 73, ron, n9ee/r --- In Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com, [EMAIL PROTECTED] wrote: Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike
Re: [Repeater-Builder] D-Star demo
That's the nature of narrowband AND digital audio combined. The digital audio is akin to audio noise reduction (like Dolby NR) in that the path noise is virtually eliminated making it much easier to hear the transmitted audio. Of course if the signal strength suffers so much that the receiving end can not correct for the errors then the signal garbles or goes digital. Here at home we often use D-Star simplex over many miles and have enjoyed some good results so far. My group at Dayton stayed in the same area and used digital audio all weekend with no interference and improved comms between units inside the arena to units outside the arena as well as from the motel to the arena. We've never been able to do that 100% with an analog channel. Gary Chuck Kraly wrote: Not sure about the radios, but this echoes what we found in Dayton last weekend. We were running U82's all weekend, And Saturday myself and N0EUH were back at the hotel just up the street from Smokey Bones and right next to I75 One of our crew called us on low power simplex, and it sounded like he was right next to us. He was in the flea market at Hara. I was really impressed. It was crystal clear. Chuck K0XM -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wright, Skywarn Coodinator Sent: Sunday, May 27, 2007 9:48 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] D-Star demo hi all, In the FILES section of this board is a Weak Sig D-Star demon by WB9WZB. Most impressive test. Can anyone give details of the test...was same rig with power levels and antennas used in the test??? 73, ron, n9ee/r Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.0/819 - Release Date: 5/26/2007 10:47 AM No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.0/819 - Release Date: 5/26/2007 10:47 AM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.472 / Virus Database: 269.8.0/819 - Release Date: 5/26/2007 10:47 AM Yahoo! Groups Links
Re: [Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s)
When the comparison is figured out, don't forget the security issue. Do you REALLY want a scheme where anyone will have access to open your doors? Joe M. Ron Wright, Skywarn Coodinator wrote: Joe, Doing it on the repeater or base freq would allow other users to open the gate if one did not have the code. I like the garage door approach, but having longer range has it advantages and of course disadvantages. I should ask, do the users now have DTMF mikes. These are not cheap, but easy to install. 73, ron, n9ee/r --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: But, if I did this, it would not be an off the shelf product and I would end up being the support repair for the units. There may be several of them. They want to use the talk around frequency to activate the gate. joe -- Original message -- From: Dick [EMAIL PROTECTED] Joe: Probably one of the cheapoest ways to do this would be to get an el cheapo rptr controller and connect it to a VHF rcvr. The company can then buy DTMF mikes for their radios. If it were me, I'd set up a separate VHF freq or the same freq with a different PL for the gate actuator. I prefer the seprate freq so they won't broadcast the gate actuator code all over the world. 73, Dick W1NMZ - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: 26 May, 2007 13:03 Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike Yahoo! Groups Links
Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s)
Here's an easy idea that is currently in use. A police department wanted a way to open a garage door from the cruiser, other than calling the station and having them push a button. Solution was to take an old radio (Maxtrac in thsis case) laying around, install it into a metal box, bring out the PL/DPL decode indication to drive a relay and install at the site. No antenna on the radio, receive only. Programmed for an odd DPL on a low usage channel owned by the PD. Cars have a channel marked DOOR. Cop pulls up to the door, switches to the DOOR channel and keys the mic. Door goes up. Nice quiet and painless. Something that any competent shp can easily accomplish. Milt N3LTQ - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, May 26, 2007 4:03 PM Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. 73, Joe, k1ike Yahoo! Groups Links
[Repeater-Builder] NEW Motorola project UHF PURC to amateur repeater
Hi Gang, I have a new Motorola project. It's to convert a UHF PURC to amateur repeater. The transmitter is wireline controlled and has no receiver. The machine has a 250W? PA and had the 3CX400A7 replaced on 2002. It has had very little use and came with a spare Eimac tube. I haven't checked it out yet but it was working in October when it was taken off the air. It looks like a MICOR station with a hefty PA and heftier power supply. I can't seem to find anything on the PA on the net. I know it will have to be retuned but I dare not with out expert help or a manual or both. Any suggestions? Thanks AC0Y
RE: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s)
I have been following this thread with some interest, because the suggestions vary between relative extremes of cost. complexity, and practicality. As I understand the concept, the originator seeks to improve his relationship with the site owner, and has offered to improve site security and ease of access- two goals which can be mutually exclusive. The commercial sites with which I am most familiar generally have three barriers. The first is a simple pipe gate at the head of the access road, to keep out vehicles driven by sightseers. It usually has multiple padlocks, since the area may also be used by ranchers, oil people, and forestry personnel. This gate is strictly mechanical, and it won't keep out hikers and mountain bikers. The next barrier is a chain-link fence surrounding the site. Sometimes topped with barbed wire, it keeps out all but the most determined intruders. Since the gate must allow a service truck to pass, it is usually hand-operated and padlocked. Electrically-operated gates are seldom used here because of the climate and the amount of maintenance such gates require. The fence is intended to keep out vandals and mischief-makers. The final barrier is the door to the radio shack, which is usually steel and may have an electric lock with a keypad or proximity card sensor, but it may just be padlocked. The prox card with a keypad to accept the technician's PIN is the most desirable, since any one user can be added or removed from the access list at any time, often remotely, and there is a permanent record of each person's comings and goings. I recently priced an electrically-operated vehicle gate that was suitable for a remote site, and found that it would cost about $80,000 to purchase and install. This is much more than a simple panel of fencing that rolls back and forth in a track- it is equal in security to the fence itself, and that makes a big difference! My local police department uses a rolling gate to secure the back parking lot where the cruisers and motorcycles are parked. The gate can be opened by the dispatcher, but it normally is opened by a garage-door transmitter clipped to the visor in each vehicle. The gate closes automatically a minute or so after it is opened. The lot is under video camera surveillance, so anyone who climbs over the fence or the gate would be seen and could be apprehended within seconds. This is quite different from a mountaintop site which might take hours to reach, and which probably is not monitored with video cameras. Such gates are the weak link in a security fence, so they should be designed and built well. Finally, I have to wonder how I would be improving my standing with a site owner, if my proposal called for purchasing and installing unique radios, microphones, cables, antennas, etc., in every vehicle in the fleet that might need to go to a remote site. That's a lot of dollars and manhours, with relatively little value added. I really like the padlock idea, but I could live with the garage door opener concept- providing that there is an existing gate operator. Electric gates at mountaintop sites is a costly solution, and the preventive maintenance can be a nightmare. But hey, maybe this site owner is a cost-no-object kind of guy... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Milt Sent: Sunday, May 27, 2007 11:32 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Here's an easy idea that is currently in use. A police department wanted a way to open a garage door from the cruiser, other than calling the station and having them push a button. Solution was to take an old radio (Maxtrac in thsis case) laying around, install it into a metal box, bring out the PL/DPL decode indication to drive a relay and install at the site. No antenna on the radio, receive only. Programmed for an odd DPL on a low usage channel owned by the PD. Cars have a channel marked DOOR. Cop pulls up to the door, switches to the DOOR channel and keys the mic. Door goes up. Nice quiet and painless. Something that any competent shp can easily accomplish. Milt N3LTQ - Original Message - From: [EMAIL PROTECTED] mailto:k1ike_mail%40comcast.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Saturday, May 26, 2007 4:03 PM Subject: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) Hello to All, I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available.
[Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s
Moving along... There is a method/circuit found at airports where pilots tx click radio mics in rapid sequence to turn on night-time runway lights. It's not high security at a locked electric gate but it does work if the secret can be kept under control. And you wouldn't have to buy/supply dtmf mics. As just a sidebar thought... you could set up a circuit for... say 3 rapid clicks and one or two long clicks to open the gate. I can see that easily being done with some cmos d flip flop logic or a small pic processor if you really were motivated. It'll be much more secure than broadcasting tones over the company frequency where someone could be listening. Also, the garage door openers are short range so that there's less chance of an accidental unlocking. They rejected this idea. They want to use the company radios, for some reason that I can't figure out. Joe One other idea I just thought of is simply using a ctcss decoder with a different ctcss on the same channel. No dtmf mic required... just program a second same frequency - different ctcss encode into radio and hit the mic tx button. If you wanted an extra level of security... make it (add) a 3 mic fixed time tx click detect circuit to prevent any false ctcss circuit detects. Or a 3 to 5 second second ctcss long detect-time requirement to fire the gate open controller logic. And... you could offer up the second ctcss decode remote access control from a much more distant user/admin location (a selling feature!) if you use a good receiver on a decent antenna. The key-chain remote control system is probably the most practical and cost effective secure choice for some empire building admin (supervisor) type people . It's often sold by Jameco type places and it's cheap enough. The second ctcss possible mic click detect circuit simply involves programming a second channel into the user radio and some basic user instruction. (a club to the side of the head until they get it right) I haven't seen much of a generic commercial rough-service dtmf mic that really gets my motor going. cheers, skipp Actually, they will have to replace all the mikes with TT mikes. Given the cost of the new mikes and special equipment at the electric gates, etc, it would be a lot cheaper to go with the garage door opener style system. Maybe I'll work up an estimate of what they might spent for both systems and the economics might help them make a better choice. joe
[Repeater-Builder] Re: Need to find a product to develop goodwill at a tower site(s)
The simplest method is to use a weatherproof door opener receiver and regular door opener transmitters to open a gate. There are 10 dip switches in the transmitter so you can come up with a very secure code. Then issue a door opener TX to each person requiring site access. It's Understood that the receiver would operate a relay and turn on the power to the motor to open the gate. Check this site: http://www.stanley-garage-door-opener.com/ They have stand alone receivers that will work well. I build modified transmitters for a local company and they can select up to 10 different doors to be opened with a rotary switch ( 1 - 10 ). John VE3AMZ Waterloo Ont. - Original Message - From: Eric Lemmon [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Sunday, May 27, 2007 3:24 PM Subject: RE: [Repeater-Builder] OT: Need to find a product to develop goodwill at a tower site(s) |I have been following this thread with some interest, because the | suggestions vary between relative extremes of cost. complexity, and | practicality. As I understand the concept, the originator seeks to improve | his relationship with the site owner, and has offered to improve site | security and ease of access- two goals which can be mutually exclusive. | | The commercial sites with which I am most familiar generally have three | barriers. The first is a simple pipe gate at the head of the access road, | to keep out vehicles driven by sightseers. It usually has multiple | padlocks, since the area may also be used by ranchers, oil people, and | forestry personnel. This gate is strictly mechanical, and it won't keep out | hikers and mountain bikers. | | The next barrier is a chain-link fence surrounding the site. Sometimes | topped with barbed wire, it keeps out all but the most determined intruders. | Since the gate must allow a service truck to pass, it is usually | hand-operated and padlocked. Electrically-operated gates are seldom used | here because of the climate and the amount of maintenance such gates | require. The fence is intended to keep out vandals and mischief-makers. | | The final barrier is the door to the radio shack, which is usually steel and | may have an electric lock with a keypad or proximity card sensor, but it may | just be padlocked. The prox card with a keypad to accept the technician's | PIN is the most desirable, since any one user can be added or removed from | the access list at any time, often remotely, and there is a permanent record | of each person's comings and goings. | | I recently priced an electrically-operated vehicle gate that was suitable | for a remote site, and found that it would cost about $80,000 to purchase | and install. This is much more than a simple panel of fencing that rolls | back and forth in a track- it is equal in security to the fence itself, and | that makes a big difference! | | My local police department uses a rolling gate to secure the back parking | lot where the cruisers and motorcycles are parked. The gate can be opened | by the dispatcher, but it normally is opened by a garage-door transmitter | clipped to the visor in each vehicle. The gate closes automatically a | minute or so after it is opened. The lot is under video camera | surveillance, so anyone who climbs over the fence or the gate would be seen | and could be apprehended within seconds. This is quite different from a | mountaintop site which might take hours to reach, and which probably is not | monitored with video cameras. Such gates are the weak link in a security | fence, so they should be designed and built well. | | Finally, I have to wonder how I would be improving my standing with a site | owner, if my proposal called for purchasing and installing unique radios, | microphones, cables, antennas, etc., in every vehicle in the fleet that | might need to go to a remote site. That's a lot of dollars and manhours, | with relatively little value added. I really like the padlock idea, but I | could live with the garage door opener concept- providing that there is an | existing gate operator. Electric gates at mountaintop sites is a costly | solution, and the preventive maintenance can be a nightmare. But hey, maybe | this site owner is a cost-no-object kind of guy... | | 73, Eric Lemmon WB6FLY | | | -Original Message- | From: Repeater-Builder@yahoogroups.com | [mailto:[EMAIL PROTECTED] On Behalf Of Milt | Sent: Sunday, May 27, 2007 11:32 AM | To: Repeater-Builder@yahoogroups.com | Subject: Re: [Repeater-Builder] OT: Need to find a product to develop | goodwill at a tower site(s) | | Here's an easy idea that is currently in use. A police department wanted a | way to open a garage door from the cruiser, other than calling the station | and having them push a button. Solution was to take an old radio (Maxtrac | in thsis case) laying around, install it into a metal box, bring out the | PL/DPL decode indication to drive a relay and install at the site. No |
Re: [Repeater-Builder] Re: OT: Need to find a product to develop goodwill at a tower site(s
I like the key click idea - get an older CES phone patch with 5 key click dialing - when the line goes off hook (on a local battery circuit with a relay in series) let the loop current call in a relay to activate the door opener - no security but kinda neat and it could time out after so many seconds (I think) - best luck, Steve NU5D On 5/27/07, skipp025 [EMAIL PROTECTED] wrote: Moving along... There is a method/circuit found at airports where pilots tx click radio mics in rapid sequence to turn on night-time runway lights. It's not high security at a locked electric gate but it does work if the secret can be kept under control. And you wouldn't have to buy/supply dtmf mics. As just a sidebar thought... you could set up a circuit for... say 3 rapid clicks and one or two long clicks to open the gate. I can see that easily being done with some cmos d flip flop logic or a small pic processor if you really were motivated. It'll be much more secure than broadcasting tones over the company frequency where someone could be listening. Also, the garage door openers are short range so that there's less chance of an accidental unlocking. They rejected this idea. They want to use the company radios, for some reason that I can't figure out. Joe One other idea I just thought of is simply using a ctcss decoder with a different ctcss on the same channel. No dtmf mic required... just program a second same frequency - different ctcss encode into radio and hit the mic tx button. If you wanted an extra level of security... make it (add) a 3 mic fixed time tx click detect circuit to prevent any false ctcss circuit detects. Or a 3 to 5 second second ctcss long detect-time requirement to fire the gate open controller logic. And... you could offer up the second ctcss decode remote access control from a much more distant user/admin location (a selling feature!) if you use a good receiver on a decent antenna. The key-chain remote control system is probably the most practical and cost effective secure choice for some empire building admin (supervisor) type people . It's often sold by Jameco type places and it's cheap enough. The second ctcss possible mic click detect circuit simply involves programming a second channel into the user radio and some basic user instruction. (a club to the side of the head until they get it right) I haven't seen much of a generic commercial rough-service dtmf mic that really gets my motor going. cheers, skipp Actually, they will have to replace all the mikes with TT mikes. Given the cost of the new mikes and special equipment at the electric gates, etc, it would be a lot cheaper to go with the garage door opener style system. Maybe I'll work up an estimate of what they might spent for both systems and the economics might help them make a better choice. joe Yahoo! Groups Links -- Ham Radio Spoken Here.NU5D Nickel Under Five Dollars
