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 | 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. 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 | | | |
