[Repeater-Builder] Re: SEA ESP1000 220Mhz Repeater
And if anyone wants more of the ESP1000 units, I have 5 available *CHEAP*, but you gotta come get em in auburn, ca. I figured at the very least, they have a nice switching supply, and a bunch of RF goodies in the rx tx, like the brick/hybrid RF modules, etc. Appears to be the same RF stuff as the mobiles. One of mine does have the master oscillator in it. 73, dave' na6df --- In Repeater-Builder@yahoogroups.com, DCFluX dcf...@... wrote: Don't throw them out yet. I was working on a NBFM mod, but just moved and things are all shook up. http://groups.yahoo.com/group/Repeater-Builder/files/FluX%20Research/SEA%20ESP1000%28M%29%2C%20ESP1100%28M%29%2C%20ESP-504/ http://pages.cs.wisc.edu/~timc/e/esp504222.html
[Repeater-Builder] Re: SEA ESP1000
You are on the right track. 20 watts is not really enough power. Most of the 220 acsb systems I saw were poorly applied and built from plans made by people who appear to have never been in the field. When you get into a new technology, there is always strange issues to be dealt with. I had some Intek/Securicor technical files, which indicated to me they were not properly dealing with those issues. You can only hide so long behind a patch job. Something about customer support also comes into play. cheers, skipp ps: There is still a system or two in operation up here in Nor-Cal. How many people are on it is another question... Jim B. [EMAIL PROTECTED] wrote: I'm surprised-all of the 220 ACSB systems I've seen had very poor coverage compared to 460 Mhz FM rptrs at the same sites. They typically had to put 100W amps on the base tx to even get vaguely close. That's why most of the customers left. -- Jim Barbour WD8CHL Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * 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] Re: SEA ESP1000
Here is the preliminary schematic. Because the synth chip in the radio uses +9 V for some reason, this will have to be a board with SMD parts on it instead of a single chip. The plan is for Channel 1 to start at 223.85 with 10kHz spacing and channel 201 starts at 222.15 MHz. There will be jumpers to select wheather the board is in the RX or TX module so the 1.6MHz spacing is observed, this may be changed though as the program could be written so that it would look at the incoming data and know which side it was in which would be better for mobiles and HTs anyway. Also a jumper would select 5kHz spacing to allow tighter spacing with 20 channels in the ACSSB portion of the band from 222.15 - 222.25 / 223.75 - 223.85. This would also extend into the normal FM portion but not cover all of it. Still searching for a repeater to experiment on to write the software needed for the board to run. Let me know if anyone has one cheap. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * 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/ attachment: Synth Fooler.GIF
[Repeater-Builder] Re: SEA ESP1000
The conversion to FM or a change to the Amateur Range is not practical. They are ACSB repeaters and there are 2 types... depending on who's format you have. Using ACSB is anoter story... It works just killer with a 20 watt radio going many times the distance a similar power FM signal. The repeaters, format and power level work pretty well. But you need to have support people and real customers to pay the bills. There are just a few of the 220 systems still in operation out here on the west coast... Intek and Securicor went poof with an interesting technician story or two When a lot of the ACSB 220 stuff came out of service, the matching Zetron 49 trunking controllers made the Ebay Commercial Radio Sharks go crazy... only to find out the ACSB trunking controller was nothing like the FM mode 49 trunking controller. That'll teach them to use their darn snipe programs... I have most of the surplus Antenna System/combiner Equipment for the Intek and Securicor systems pulled from the West Coast. Anyone looking for a nice deal on a 220 - 225 MHz duplexer or cavities..? cheers, skipp Eric Lemmon [EMAIL PROTECTED] wrote: Jeff, I have a working ESP1000 repeater, and I am convinced that it is not worth the effort and expense it will take to convert it the 220 Amateur band. The primary impediment to conversion is that the SEA ESP1000, and all of the mobile and portable radios associated with it, operate on companded AM single sideband. I talked with an engineer at the company that now markets SEA products, and he told me that the conversion to wider bandwidth FM would involve a major redesign of both transmitter and receiver. In addition, the synthesizers are blocked from being programmed out of band. Perhaps the most practical action is to throw away the SEA transmitter and receiver boards, and replace them with Hamtronics or Maggiore modules. At least, you'd be able to use the chassis and power supply. 73, Eric Lemmon WB6FLY Jeff wrote: Has anyone here been able to take a SEA ESP1000 commercial 220 acsb repeater and mobile and retune to the amateur part of the spectrum There are a lot of these repeaters floating around and I have used them for commercial applications and they have fantastic coverage and I'm sure they would be great in the amateur band. Does anyone know Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * 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] Re: SEA ESP1000
Anyone have an extra one of these repeaters they are willing to sacrafice for experimentation purposes? Seeing as 4K00J3E is an aceptable emission in the ham bands it has been decided to leave the modulation type the same (ACSSB). This would allow use of the surplus HT and mobile radios currently on the market and it apears to have advantages over FM. Taking a first glance at the schematic it looks to me that the best angle of attack is a chip that will sit on the control pins for both the RX and TX boards that will intercept the normal synthisizer command and replace them with what ever the command was and add a 2 MHz off set to the channel with a jumper to add an additional 1.6 MHz on top of that for use in the other side. But I need some confirmations for this to work. Can the transmitter be freely assigned to channels 1-399 or is it stuck on 1 - 199? This is because I need approx 1.22 MHz of channels and I would only have enough addresses for 1.00MHz if the transmitter can only get the 200 channels. The concept would then be that transmit channel 1 = 222.0 MHz and each channel incr would be 5kHz. Receiver channel 1 would be 223.6. This would allow programing of the channels from the front panel instead of burning a chip every time you QSYed the repeater. And theoretically it would allow the repeater to run trunked. We could still get away with the 200 channels but the spacing would have to increase to either 10 or 15kHz, which ever is standard in the 220 realm and that just wouldn't be as nice as the carrier is only taking up 4K of bandwidth anyway, Most of 220 is a mystery for me, so I would also like some information on what the official band plan and channel spacings are. Not a lot of kids on the block have 220 anything. On a related note, I think that the idea I have for a cheap duplexer for 2M wont work very good there as the spacing needs to be 800kHz minimum for low insertion loss. so it should be cost effective for 220, where 1.6M is the split. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * 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/
[Repeater-Builder] Re: SEA ESP1000
Pay attention to what you buy. The 220 stuff is found under SEA, Intek, Securico, Midland and LMR Linear Modulation brand names. Again there are two ACSB formats in use and they do not talk to each other. I know of a group of people running around with surplus ACSB units on simplex/talk - around/ direct. They were not able to get the units up to the ham bands, but the mobiles will program and work simplex in the 220-221 range. About 2 years ago, you could have had the SEA Repeaters all day long for $50 from Ebay. skipp DCFluX [EMAIL PROTECTED] wrote: Anyone have an extra one of these repeaters they are willing to sacrafice for experimentation purposes? Seeing as 4K00J3E is an aceptable emission in the ham bands it has been decided to leave the modulation type the same (ACSSB). This would allow use of the surplus HT and mobile radios currently on the market and it apears to have advantages over FM. Taking a first glance at the schematic it looks to me that the best angle of attack is a chip that will sit on the control pins for both the RX and TX boards that will intercept the normal synthisizer command and replace them with what ever the command was and add a 2 MHz off set to the channel with a jumper to add an additional 1.6 MHz on top of that for use in the other side. But I need some confirmations for this to work. Can the transmitter be freely assigned to channels 1-399 or is it stuck on 1 - 199? This is because I need approx 1.22 MHz of channels and I would only have enough addresses for 1.00MHz if the transmitter can only get the 200 channels. The concept would then be that transmit channel 1 = 222.0 MHz and each channel incr would be 5kHz. Receiver channel 1 would be 223.6. This would allow programing of the channels from the front panel instead of burning a chip every time you QSYed the repeater. And theoretically it would allow the repeater to run trunked. We could still get away with the 200 channels but the spacing would have to increase to either 10 or 15kHz, which ever is standard in the 220 realm and that just wouldn't be as nice as the carrier is only taking up 4K of bandwidth anyway, Most of 220 is a mystery for me, so I would also like some information on what the official band plan and channel spacings are. Not a lot of kids on the block have 220 anything. On a related note, I think that the idea I have for a cheap duplexer for 2M wont work very good there as the spacing needs to be 800kHz minimum for low insertion loss. so it should be cost effective for 220, where 1.6M is the split. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * 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] Re: SEA ESP1000
What is the difference in the formats? Pilot tone? It looks like the SEA repeater is based on two mobile radios, so the chip I am working on should be compatible with most of their equipment, as long as it uses the MC145158 synthesizer. I saw a repeater on there with a dutch auction, but I believe in buy it now, to avoid the snipers. I also think that $200+ is a little out of the budget for experimentation. I should also mention that I need the ESP1000M that has the 10.275MHz reference oscillator/oven module built in. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * 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/
