Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150
OK Ian Hope that helps. Regards Don - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 03, 2010 4:29 PM Subject: Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Thanks don that would explain the trouble I had a couple years ago and we setup the radios to decode on their own .that works ok but it is slow Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: Don Crutcher Date: 3/03/2010 4:21:09 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Hello again Ian I've also tried a decoder with a 4 MHz crystal and it still heterodyned. Get a tunable decoder and your troubles will be solved. What I found was if I turned up the TX CTCSS encode, the decoder activated and held up the receiver which held up the transmitter etc. We also had a ~ 1KHz whistle, probably the receive signals or TX were off frequency by that much. Peter VK2ZTV also has had the same problem with FM-828's Regards Don vk2zcz - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 03, 2010 3:12 PM Subject: Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 From the manual it says it uses a 4 meg crystal Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: Don Crutcher Date: 3/03/2010 3:04:49 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Hello Ian IF your repeater is a UHF and the CTCSS decoder has a 5 MHz crystal oscillator, it will mix with the transmitter and give a signal at the receiver frequency 5 MHz lower (in Australia RX 433-435 TX 438-440 MHz) This a is a common occurrence with UHF Philips FM-828's. The fix is to use a tuneable CTCSS decoder and not use the one with a crystal oscillator in it. Been there and done that. Took years to find out why we had a whistle in the receiver (heterodyne). Regards Don vk2zcz - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 03, 2010 2:48 PM Subject: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Hi guys .I was looking at adapting a midian tds-1 to a maxon pm150 but we end up with feedback problems when used in repeater . Can anyone suggest ideas to give rf protection to the decoder chip .I came up with shielded cable between the board and the chip And to install the chip in a metal case on near the radio .or mounting it as close to the rf motherboard as possible but I don't think It will fit under the lid .The reason we would like to use the tds-1 is that the radio has to unmute before it decodes And I would like it to decode before the signal opens the mute .This improves the speed the repeater opening up On a valid signal . Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150
Hello again Ian I've also tried a decoder with a 4 MHz crystal and it still heterodyned. Get a tunable decoder and your troubles will be solved. What I found was if I turned up the TX CTCSS encode, the decoder activated and held up the receiver which held up the transmitter etc. We also had a ~ 1KHz whistle, probably the receive signals or TX were off frequency by that much. Peter VK2ZTV also has had the same problem with FM-828's Regards Don vk2zcz - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 03, 2010 3:12 PM Subject: Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 From the manual it says it uses a 4 meg crystal Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au ---Original Message--- From: Don Crutcher Date: 3/03/2010 3:04:49 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Hello Ian IF your repeater is a UHF and the CTCSS decoder has a 5 MHz crystal oscillator, it will mix with the transmitter and give a signal at the receiver frequency 5 MHz lower (in Australia RX 433-435 TX 438-440 MHz) This a is a common occurrence with UHF Philips FM-828's. The fix is to use a tuneable CTCSS decoder and not use the one with a crystal oscillator in it. Been there and done that. Took years to find out why we had a whistle in the receiver (heterodyne). Regards Don vk2zcz - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 03, 2010 2:48 PM Subject: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Hi guys .I was looking at adapting a midian tds-1 to a maxon pm150 but we end up with feedback problems when used in repeater . Can anyone suggest ideas to give rf protection to the decoder chip .I came up with shielded cable between the board and the chip And to install the chip in a metal case on near the radio .or mounting it as close to the rf motherboard as possible but I don't think It will fit under the lid .The reason we would like to use the tds-1 is that the radio has to unmute before it decodes And I would like it to decode before the signal opens the mute .This improves the speed the repeater opening up On a valid signal . Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Adapting ctcss decoders to maxon pm150
Hello Ian IF your repeater is a UHF and the CTCSS decoder has a 5 MHz crystal oscillator, it will mix with the transmitter and give a signal at the receiver frequency 5 MHz lower (in Australia RX 433-435 TX 438-440 MHz) This a is a common occurrence with UHF Philips FM-828's. The fix is to use a tuneable CTCSS decoder and not use the one with a crystal oscillator in it. Been there and done that. Took years to find out why we had a whistle in the receiver (heterodyne). Regards Don vk2zcz - Original Message - From: Ian Wells To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 03, 2010 2:48 PM Subject: [Repeater-Builder] Adapting ctcss decoders to maxon pm150 Hi guys .I was looking at adapting a midian tds-1 to a maxon pm150 but we end up with feedback problems when used in repeater . Can anyone suggest ideas to give rf protection to the decoder chip .I came up with shielded cable between the board and the chip And to install the chip in a metal case on near the radio .or mounting it as close to the rf motherboard as possible but I don't think It will fit under the lid .The reason we would like to use the tds-1 is that the radio has to unmute before it decodes And I would like it to decode before the signal opens the mute .This improves the speed the repeater opening up On a valid signal . Thank You ,Ian Wells Kerinvale Comaudio, 361 Camboon road, Biloela.4715 Ph 0749922449 Mb 0409159932 Hm 0749922574 Fx 0749922767 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] remote head ?
Hello David On the remote head there are usually 2 cables, 1 red and 1 black. The Black is the remote mike, volume, mute, on/off, the Red is the channel change. Plug the Red 10 pin WIST plug into the Red socket and the Black into the Black socket. Set the channel switch on the remote to the channel that you have the TX and RX crystals installed in. The circuit is usually in the rear of the FM-828 handbook. Regards Don vk2zcz - Original Message - From: David To: Repeater-Builder@yahoogroups.com Sent: Monday, October 26, 2009 5:14 PM Subject: [Repeater-Builder] remote head ? Hi Everyone, i have a remote head fm828/25 A/R MK2 radio with a remote head that i hope to use as a repeater there are two sockets on the back of the radio one has a red strip around it what socket do i plug the remote head into to see if the radio work's ??...Rgs David VK4DJC.
Re: [Repeater-Builder] schematics T856/05
Hello Joost Try the Tait web page of obsolete equipment. http://www.taitworld.com/technical/index.cfm/4,0,76,46,html Regards Don vk2zcz - Original Message - From: pe1rmn To: Repeater-Builder@yahoogroups.com Sent: Sunday, September 21, 2008 8:43 PM Subject: [Repeater-Builder] schematics T856/05 hi .. 1- i am looking for the "complete" schematics of the VHF Tait T356/05 transmitter. i have scanned drawing but it is mising the Crystal oscilator part. 2- i want to implement CTCSS in the receiver T355/05 is there anyone who has ideas ??? howto/where from ... with kind regards Joost , PE1RMN http://pi3goe.web-log.nl
Re: [Repeater-Builder] Philips FM814 circuits
Hello Stef Does your handbook have a Buff or Blue cover, I have both, my Blue cover HB is dated 1985 Issue 2. The PCB numbers are for the blank board and not the made up board part number, just to be difficult. Looking at the Receiver layout in my Blue HB, I can see the PCB number (backwards) 3502 309 95141 iss. I, so I am assuming that the Blue Handbook is the one you need. Luckily I have a CD from Phil VK1ZPL that has the Blue handbook as ~ 140 x A4 .jpg drawings all ~ 1+ MB each, the ccts are made up from 4 x A4 pics and need to be joined, they all add up to 140 MB, so it's not feasible to send via Email. If you want I can copy to a CD and send to you. Regards Don vk2zcz - Original Message - From: stef To: Repeater-Builder@yahoogroups.com Sent: Thursday, May 01, 2008 8:40 PM Subject: [Repeater-Builder] Philips FM814 circuits Hello fellow repeater builders, I am repairing 2 Philips FM814 VHF repeaters and I am in need of some circuit diagrams. I have 2 manuals for Philips FM814's already but neither of them cover the circuit boards used in the units I have as they are late models from near the end of the line. I am hopeful that somone may have circuit schematics for the following boards with the Philips numbers. a.. Receiver board 3502 309 92141 issue I . b.. control & Regulator board 3502 309 9200 issue D. c.. Driver board 3502 309 91751 issue A. d.. Oscillator board OM806 309 92261 issue F. e.. Power amplifier board 3502 309 90481 issue F. f.. Audio board only marking on board is 8845. All these boards have dates screen printed on them from 1988 to 1989. Some I/O pin connections and component hardware are different to the earlier versions covered by the manuals I have. Philips/Simoco can not help me with any of the circuits because, they say, of the age of the repeaters. Hoping somone may be able to help me with the schematics. Regards VK4YHB
Re: [Repeater-Builder] Mitrek Reedless PL Board
- Original Message - From: Eric Grabowski To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 30, 2007 10:10 PM Subject: [Repeater-Builder] Mitrek Reedless PL Board Does anyone know for certain whether the Mitrek HLN4181A reedless PL board can be used for encode and decode simultaneously? Eric, KH6CQ __ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
Re: [Repeater-Builder] Happy Holidays
- Original Message - From: Don To: Repeater-Builder@yahoogroups.com Sent: Tuesday, December 25, 2007 7:55 AM Subject: [Repeater-Builder] Happy Holidays I would at this time like to Wish all Members Families and Friends the Best wishes For a Wonderful Holiday Season and it has been a Privilege being part of this Wonderful group and the People Associated with it. PS And Let us Pray for Our Service people scattered around the World And the Less Fortunate Don and Family KA9QJG