RE: [Repeater-Builder] Maxon sm4450sc
Hi Eric .Two radios here are not working properly and I found in one that the 8meg crystal was 2.4khz off frequency and in the other radio there is no 8 megs at all.so this should explain the radios not working .on a good radio the ctcss was 131.8 and the crystal was very near to the 8.2944mhz .On the service monitor the 131 was stable but the .8 was flicking up and down a little but it never altered from 131hz Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au ---Original Message--- From: Eric Lemmon Date: 18/10/2009 09:16:09 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Maxon sm4450sc Ian, The CTCSS tones are derived from the timing of ASIC IC107, and are independent of the carrier frequency control circuit. Use your service monitor to sniff around the CPU to see if the clock is running at or very close to 8.2944 MHz. If it is way off, you'll need to replace the X1 crystal since there is no adjustment. Crystal X1 is type HC-184, part number 260-862-6Z. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups com] On Behalf Of kerinvale Sent: Saturday, October 17, 2009 2:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Maxon sm4450sc Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells
RE: [Repeater-Builder] Maxon sm4450sc
Ian, The CTCSS tones are derived from the timing of ASIC IC107, and are independent of the carrier frequency control circuit. Use your service monitor to sniff around the CPU to see if the clock is running at or very close to 8.2944 MHz. If it is way off, you'll need to replace the X1 crystal, since there is no adjustment. Crystal X1 is type HC-184, part number 260-862-6Z. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kerinvale Sent: Saturday, October 17, 2009 2:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Maxon sm4450sc Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells
RE: [Repeater-Builder] Maxon sm4450sc
Thanks . I will check them out Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Ph 0749922449 or 0409159932 or 0749922574 www.kerinvalecomaudio.com.au ---Original Message--- From: Eric Lemmon Date: 18/10/2009 09:16:09 To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Maxon sm4450sc Ian, The CTCSS tones are derived from the timing of ASIC IC107, and are independent of the carrier frequency control circuit. Use your service monitor to sniff around the CPU to see if the clock is running at or very close to 8.2944 MHz. If it is way off, you'll need to replace the X1 crystal since there is no adjustment. Crystal X1 is type HC-184, part number 260-862-6Z. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups com] On Behalf Of kerinvale Sent: Saturday, October 17, 2009 2:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Maxon sm4450sc Hi guys .Has anyone come across the ctcss frequency being a little off frequency on a maxon sm4450 I.e. For 123 Hz the radio produces 122.5hz or below is there anyway to make the radio produce the exact programmed Hz Thank You, Ian Wells
Re: [Repeater-Builder] Maxon sm4450sc
At 02:16 PM 08/10/09, you wrote: Hi guys .thanks for the replys .The fault was I had too much length between the radio and the ctcss decoder card .I have altered most of my repeaters to allow the maxons to decode the signal by itself and then it controls the transmitter by the maxon approved design with a bs170 fet .I have now developed a interface circuit that has no relays for switching audio .and the new design uses a 4066 audio IC to switch audio paths .It has reduced transmitting delays very well .Now the repeaters seem to work almost as soon as a signal comes in .One repeater decodes even if the signal is just below the mute .I need to find out how that one works.All in all very happy I have found the problem .Now I have repeaters with no ctcss breakup. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 http://www.kerinvalecomaudio.com.au/www.kerinvalecomaudio.com.au If you have not cast your design into concrete yet you might want to make one parts change. Use the 4053 (3 SPDT switches in one package) instead of the 4066 (4 SPST switches). Use the SPDT switches to feed either audio or audio ground to the next circuit downstream. With SPST you can only open and close the audio path leaving the downstream input floating when the switch is open. This can lead to hum, or at a site with high RF levels, other grunge. Rarely do common interface circuits need 4 switches, and the cost of the chip is pretty much the same. Mike WA6ILQ
Re: [Repeater-Builder] Maxon sm4450sc
Thanks mike good suggestion Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Mike Morris WA6ILQ Date: 12/08/2009 07:53:27 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc At 02:16 PM 08/10/09, you wrote: Hi guys .thanks for the replys .The fault was I had too much length between the radio and the ctcss decoder card .I have altered most of my repeaters to allow the maxons to decode the signal by itself and then it controls the transmitter by the maxon approved design with a bs170 fet .I have now developed a interface circuit that has no relays for switching audio .and the new design uses a 4066 audio IC to switch audio paths .It has reduced transmitting delays very well .Now the repeaters seem to work almost as soon as a signal comes in .One repeater decodes even if the signal is just below the mute .I need to find out how that one works.All in all very happy I have found the problem .Now I have repeaters with no ctcss breakup. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au If you have not cast your design into concrete yet you might want to make one parts change. Use the 4053 (3 SPDT switches in one package) instead of the 4066 (4 SPST switches). Use the SPDT switches to feed either audio or audio ground to the next circuit downstream. With SPST you can only open and close the audio path leaving the downstream input floating when the switch is open. This can lead to hum, or at a site with high RF levels, other grunge. Rarely do common interface circuits need 4 switches, and the cost of the chip is pretty much the same. Mike WA6ILQ
Re: [Repeater-Builder] Maxon sm4450sc
Hi guys .thanks for the replys .The fault was I had too much length between the radio and the ctcss decoder card .I have altered most of my repeaters to allow the maxons to decode the signal by itself and then it controls the transmitter by the maxon approved design with a bs170 fet .I have now developed a interface circuit that has no relays for switching audio .and the new design uses a 4066 audio IC to switch audio paths .It has reduced transmitting delays very well .Now the repeaters seem to work almost as soon as a signal comes in .One repeater decodes even if the signal is just below the mute .I need to find out how that one works.All in all very happy I have found the problem .Now I have repeaters with no ctcss breakup. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: kerinvale Date: 11/07/2009 02:18:36 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc Thanks for the reply Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Razvan Daniel Date: 10/07/2009 21:57:50 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc Hey, You can use the external card, just shield it as well as possible by placeing it into a metal grounded case and using double or triple shieldee coaxial condutors to link it to the radio. This wil prevent any interference from dispurbing the useful signals. This having said, please take into consideration that if the TX antenna is at least several meters away then you should check the feeder, connectors and antenna reflected wave, since this diturbance should not normlly happen in good configuration. I have also noticed that for some reason, the internal decoder takes a wihile to react to the carier CTSS signal. It may be a design glitch or it may be possible that a optional delay might exist via software. I never checked. For these reasons, I think the external card is best. Regards, Buie Daniel Razvan RADIOCOM Bihor 004 741 133740 buie.raz...@radiotelecomunicatii.ro www.radiotelecomunicatii.ro --- On Fri, 7/10/09, kerinvale kerin...@pacific.net.au wrote: From: kerinvale kerin...@pacific.net.au Subject: [Repeater-Builder] Maxon sm4450sc To: Repeater-Builder@yahoogroups.com Date: Friday, July 10, 2009, 4:35 AM Hi guys .I have a maxon sm4450sc that is setup for rx ctcss decode in a repeater and it is decoding ctcss ok but it only activates the call led when the signal is over the squelch level. I am wondering is there a way that the radio decoder can be on all the time so even if the signal is below the squelch the radio will activate the call led without affecting the audio squelch level. I tried to use ctcss external decoder card and they work great with direct connection to the receiver audio out from the detector but as I have found out recently with the cards outside the radio they are affected badly with rf when the transmitter is activated if the leads are too long so I have setup the radio to decode the ctcss and this is working well but it is slow to activate the repeater.I am trying to set the receiver up that it will decode as soon as the signal is present instead of it needing it to be over the squelch level before decoding. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela. 4715 Phone 0749922574 or 0409159932 www.kerinvalecomaud io.com.au
Re: [Repeater-Builder] Maxon sm4450sc
Hey, You can use the external card, just shield it as well as possible by placeing it into a metal grounded case and using double or triple shieldee coaxial condutors to link it to the radio. This wil prevent any interference from dispurbing the useful signals. This having said, please take into consideration that if the TX antenna is at least several meters away then you should check the feeder, connectors and antenna reflected wave, since this diturbance should not normlly happen in good configuration. I have also noticed that for some reason, the internal decoder takes a wihile to react to the carier CTSS signal. It may be a design glitch or it may be possible that a optional delay might exist via software. I never checked. For these reasons, I think the external card is best. Regards, Buie Daniel Razvan RADIOCOM Bihor 004 741 133740 buie.raz...@radiotelecomunicatii.ro www.radiotelecomunicatii.ro --- On Fri, 7/10/09, kerinvale kerin...@pacific.net.au wrote: From: kerinvale kerin...@pacific.net.au Subject: [Repeater-Builder] Maxon sm4450sc To: Repeater-Builder@yahoogroups.com Date: Friday, July 10, 2009, 4:35 AM Hi guys .I have a maxon sm4450sc that is setup for rx ctcss decode in a repeater and it is decoding ctcss ok but it only activates the call led when the signal is over the squelch level. I am wondering is there a way that the radio decoder can be on all the time so even if the signal is below the squelch the radio will activate the call led without affecting the audio squelch level. I tried to use ctcss external decoder card and they work great with direct connection to the receiver audio out from the detector but as I have found out recently with the cards outside the radio they are affected badly with rf when the transmitter is activated if the leads are too long so I have setup the radio to decode the ctcss and this is working well but it is slow to activate the repeater.I am trying to set the receiver up that it will decode as soon as the signal is present instead of it needing it to be over the squelch level before decoding. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela. 4715 Phone 0749922574 or 0409159932 www.kerinvalecomaud io.com.au
Re: [Repeater-Builder] Maxon sm4450sc
Thanks for the reply Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Razvan Daniel Date: 10/07/2009 21:57:50 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon sm4450sc Hey, You can use the external card, just shield it as well as possible by placeing it into a metal grounded case and using double or triple shieldee coaxial condutors to link it to the radio. This wil prevent any interference from dispurbing the useful signals. This having said, please take into consideration that if the TX antenna is at least several meters away then you should check the feeder, connectors and antenna reflected wave, since this diturbance should not normlly happen in good configuration. I have also noticed that for some reason, the internal decoder takes a wihile to react to the carier CTSS signal. It may be a design glitch or it may be possible that a optional delay might exist via software. I never checked. For these reasons, I think the external card is best. Regards, Buie Daniel Razvan RADIOCOM Bihor 004 741 133740 buie.raz...@radiotelecomunicatii.ro www.radiotelecomunicatii.ro --- On Fri, 7/10/09, kerinvale kerin...@pacific.net.au wrote: From: kerinvale kerin...@pacific.net.au Subject: [Repeater-Builder] Maxon sm4450sc To: Repeater-Builder@yahoogroups.com Date: Friday, July 10, 2009, 4:35 AM Hi guys .I have a maxon sm4450sc that is setup for rx ctcss decode in a repeater and it is decoding ctcss ok but it only activates the call led when the signal is over the squelch level. I am wondering is there a way that the radio decoder can be on all the time so even if the signal is below the squelch the radio will activate the call led without affecting the audio squelch level. I tried to use ctcss external decoder card and they work great with direct connection to the receiver audio out from the detector but as I have found out recently with the cards outside the radio they are affected badly with rf when the transmitter is activated if the leads are too long so I have setup the radio to decode the ctcss and this is working well but it is slow to activate the repeater.I am trying to set the receiver up that it will decode as soon as the signal is present instead of it needing it to be over the squelch level before decoding. Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela. 4715 Phone 0749922574 or 0409159932 www.kerinvalecomaud io.com.au
Re: [Repeater-Builder] Maxon Sm4450sc ctcss
Thanks it worked . with our radios over here .the ones that have the 93C46 EPROM it works wether the mic is plugged in or not Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: kerinvale Date: 4/06/2009 15:15:19 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon Sm4450sc ctcss Does that mute the radio.ill try it Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Jim WB5OXQ inb Waco, TX Date: 4/06/2009 14:51:44 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon Sm4450sc ctcss Do you have the microphone hanger grounded? - Original Message - From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 03, 2009 11:44 PM Subject: [Repeater-Builder] Maxon Sm4450sc ctcss Hi guys .I have purchased a sm4450sc from the us with a 93C56 eprom.I have programmed the eprom with the sm4000 programer (sm4450-ex) with a ctcss channel.The squelch is operating ok but with the ctcss it isn't muting the audio.When a non-ctcss signal is applied the audio still comes through .When a ctcss signal is applied the call light comes on but the audio doesn't mute when its removed .Link 1 and 2 have been linked as per manual. can anyone suggest any more I need to check . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Maxon Sm4450sc ctcss
Do you have the microphone hanger grounded? - Original Message - From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 03, 2009 11:44 PM Subject: [Repeater-Builder] Maxon Sm4450sc ctcss Hi guys .I have purchased a sm4450sc from the us with a 93C56 eprom.I have programmed the eprom with the sm4000 programer (sm4450-ex) with a ctcss channel.The squelch is operating ok but with the ctcss it isn't muting the audio.When a non-ctcss signal is applied the audio still comes through .When a ctcss signal is applied the call light comes on but the audio doesn't mute when its removed .Link 1 and 2 have been linked as per manual. can anyone suggest any more I need to check . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Maxon Sm4450sc ctcss
Does that mute the radio.ill try it Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: Jim WB5OXQ inb Waco, TX Date: 4/06/2009 14:51:44 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Maxon Sm4450sc ctcss Do you have the microphone hanger grounded? - Original Message - From: kerinvale To: Repeater-Builder@yahoogroups.com Sent: Wednesday, June 03, 2009 11:44 PM Subject: [Repeater-Builder] Maxon Sm4450sc ctcss Hi guys .I have purchased a sm4450sc from the us with a 93C56 eprom.I have programmed the eprom with the sm4000 programer (sm4450-ex) with a ctcss channel.The squelch is operating ok but with the ctcss it isn't muting the audio.When a non-ctcss signal is applied the audio still comes through .When a ctcss signal is applied the call light comes on but the audio doesn't mute when its removed .Link 1 and 2 have been linked as per manual. can anyone suggest any more I need to check . Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
