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: [email protected] 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: [email protected] 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 [email protected] www.radiotelecomunicatii.ro
--- On Fri, 7/10/09, kerinvale <[email protected]> wrote: From: kerinvale <[email protected]> Subject: [Repeater-Builder] Maxon sm4450sc To: [email protected] 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
