[Repeater-Builder] DTMF/toneburst silencer/blocker
Hi I'm looking for a circuit which removes dtmf tones and maybe other tonebursts from the rx audio before it is fed to the tx. There are circuits around which use the MN3008 and MN3101 ics which are both obsolete now so are no choice. One possibility would be to replace them with similar ics from Coolaudio, but most likely these would still be hard to get even though they're still made. Does anybody have a different approach for such a tone blocker? Thanks Martin
Re: [Repeater-Builder] DTMF/toneburst silencer/blocker
At 02:00 AM 10/24/08, you wrote: Hi I'm looking for a circuit which removes dtmf tones and maybe other tonebursts from the rx audio before it is fed to the tx. There are circuits around which use the MN3008 and MN3101 ics which are both obsolete now so are no choice. One possibility would be to replace them with similar ics from Coolaudio, but most likely these would still be hard to get even though they're still made. Does anybody have a different approach for such a tone blocker? Thanks Martin Use one of the off-the-shelf boards that are designed for that... they are made by Arcom and by ICS (who got the design from Scom) See http://www.repeater-builder.com/arcom/arcom-rad-in-acc.html and http://www.ics-ctrl.com/dadm/dsdadm.html The Arcom unit is available in a board with three units on it, see here: http://www.arcomcontrollers.com/rc210/rad.html
Re: [Repeater-Builder] DTMF/toneburst silencer/blocker
The arcom rad wil only help completely dtmf when connected to the rc210 controller the rad is just a delay. The dtmf decoders are on the controller board. Rob Sent by Good Messaging (www.good.com) -Original Message- From: Mike Morris WA6ILQ [mailto:[EMAIL PROTECTED] Sent: Friday, October 24, 2008 07:39 AM Eastern Standard Time To: Repeater-Builder@yahoogroups.com Subject:Re: [Repeater-Builder] DTMF/toneburst silencer/blocker At 02:00 AM 10/24/08, you wrote: Hi I'm looking for a circuit which removes dtmf tones and maybe other tonebursts from the rx audio before it is fed to the tx. There are circuits around which use the MN3008 and MN3101 ics which are both obsolete now so are no choice. One possibility would be to replace them with similar ics from Coolaudio, but most likely these would still be hard to get even though they're still made. Does anybody have a different approach for such a tone blocker? Thanks Martin Use one of the off-the-shelf boards that are designed for that... they are made by Arcom and by ICS (who got the design from Scom) See http://www.repeater-builder.com/arcom/arcom-rad-in-acc.html and http://www.ics-ctrl.com/dadm/dsdadm.html The Arcom unit is available in a board with three units on it, see here: http://www.arcomcontrollers.com/rc210/rad.html Since 1974, the award-winning Alpert JFCS has helped families of all faiths throughout most of Palm Beach County, FL, via counseling, seniors services, residences for the disabled, mentoring children, support groups and a lot more. SOLUTIONS FOR LIVING www.JFCSonline.com Please take note of our new website and E-Mail Addresses. Please update your contacts ASAP. NOTICE: This e-mail message and all attachments transmitted with it are intended solely for the use of the addressee and may contain legally privileged and confidential information. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this message or its attachments is strictly prohibited. If you have received this message in error, please notify the sender immediately by replying to this message and please delete it from your computer.
Re: [Repeater-Builder] DTMF/toneburst silencer/blocker
Most DTMF decoder chips have an output that transitions when a valid tone pair is decoded. This output can be used to mute the transmit audio while the DTMF tones are present, snf most repeater controllers have the option of muting the DTMF control codes. In the case of a single tone, the DTMF decoder will not work. But one of the DSP audio processors will work to get rid of a single tone when it is in the 'notch' mode. I have an older Radio Shack DSP that renders CW uncopyable as only a very short click at the beginning of each element is heard. 73 - Jim W5ZIT --- On Fri, 10/24/08, cruizzer77 [EMAIL PROTECTED] wrote: From: cruizzer77 [EMAIL PROTECTED] Subject: [Repeater-Builder] DTMF/toneburst silencer/blocker To: Repeater-Builder@yahoogroups.com Date: Friday, October 24, 2008, 4:00 AM Hi I'm looking for a circuit which removes dtmf tones and maybe other tonebursts from the rx audio before it is fed to the tx. There are circuits around which use the MN3008 and MN3101 ics which are both obsolete now so are no choice. One possibility would be to replace them with similar ics from Coolaudio, but most likely these would still be hard to get even though they're still made. Does anybody have a different approach for such a tone blocker? Thanks Martin .
RE: [Repeater-Builder] DB antenna question
Jeff, Chuck, Larry and John Thanks for the responses. I new about DB making the U/V version but not about the U/U or V/V version. I think I'll opt. for converting mine to U/U and sacrifice a little gain, but maybe improve some of the lcoal coverage with better tilt down characteristics from my site. Jeff - additional filtering is not a problem here. I have a bunch of Mot. T1500 series cans available for that and several UHF isolators also. Chuck re: my last message to you and the pigtails - the intent of the question was to keep the lower harness still viable for returning to the original configuration if I needed to. Cutting a TEE off doesn't let me return it to its original operation. Again thanks for the imput and all other comment you may have. -- Doug N3DAB/WPRX486/WPJL709 Jeff DePolo [EMAIL PROTECTED] wrote: = 3. Taking an existing DB420 antenna and feeding the upper and lower halves with separate feedlines to make 2-6 Db antennas on the same mast. The lower harness section would be replaced with with the upper harness section from a junk antenna. Better idea. This used to be order-able as a DB420D, which was really two DB408's on the same mast, one stacked above the other, with the feeders for both antennas terminating at the bottom. The isolation between antennas was something like 30 dB, so again, you'll still need adequate filtering downstairs. --- Jeff WN3A
Re: [Repeater-Builder] DB antenna question
The only way to use the lower harness and still salvage/save for later is to put a dummy load on the connector where the top half of the antenna connected. Kind of ruins the efficiency. Chuck WB2EDV - Original Message - Subject: RE: [Repeater-Builder] DB antenna question Chuck re: my last message to you and the pigtails - the intent of the question was to keep the lower harness still viable for returning to the original configuration if I needed to. Cutting a TEE off doesn't let me return it to its original operation. Again thanks for the imput and all other comment you may have. -- Doug N3DAB/WPRX486/WPJL709
Re: [Repeater-Builder] DB antenna question
Chuck thanks again. I thought that would be the case. I'll try putting the splice in the lower section as you suggested and saving the the bottom TEE (with the orignal pigtail) for returning to the original configuration if needed, Just more tape and water proofing required to reinstall. -- Doug N3DAB/WPRX486/WPJL709 Chuck Kelsey [EMAIL PROTECTED] wrote: = The only way to use the lower harness and still salvage/save for later is to put a dummy load on the connector where the top half of the antenna connected. Kind of ruins the efficiency. Chuck WB2EDV - Original Message - Subject: RE: [Repeater-Builder] DB antenna question Chuck re: my last message to you and the pigtails - the intent of the question was to keep the lower harness still viable for returning to the original configuration if I needed to. Cutting a TEE off doesn't let me return it to its original operation. Again thanks for the imput and all other comment you may have. -- Doug N3DAB/WPRX486/WPJL709
Re: [Repeater-Builder] DB antenna question
Yep, you could add another connector to the cut-off parts and re-connect later if needed. - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Cc: Chuck Kelsey [EMAIL PROTECTED] Sent: Friday, October 24, 2008 3:35 PM Subject: Re: [Repeater-Builder] DB antenna question Chuck thanks again. I thought that would be the case. I'll try putting the splice in the lower section as you suggested and saving the the bottom TEE (with the orignal pigtail) for returning to the original configuration if needed, Just more tape and water proofing required to reinstall. -- Doug N3DAB/WPRX486/WPJL709 Chuck Kelsey [EMAIL PROTECTED] wrote: = The only way to use the lower harness and still salvage/save for later is to put a dummy load on the connector where the top half of the antenna connected. Kind of ruins the efficiency. Chuck WB2EDV - Original Message - Subject: RE: [Repeater-Builder] DB antenna question Chuck re: my last message to you and the pigtails - the intent of the question was to keep the lower harness still viable for returning to the original configuration if I needed to. Cutting a TEE off doesn't let me return it to its original operation. Again thanks for the imput and all other comment you may have. -- Doug N3DAB/WPRX486/WPJL709 Yahoo! Groups Links
RE: [Repeater-Builder] Re: DB antenna question
I can't see ruining the bottom half of a good harness when I have top top half from another antenna that is been damaged that I can use. Last time I had to replace one of the connectors on a DB antenna the VB material in the cable either was still sticky or got that way from trying to solder the new connector on it and it was a real pain. Is there a trick to it that I don't know ?? Your idea about re-using an old harness from the top off of an antenna for the lower half of your dual makes sense. If you're using type N connectors (either crimp or mil clamp), the goop isn't a big deal, just crimp/clamp the braid with the goo on it, it will still make solid contact and help maintain weatherproofing. If you really want to get rid of it, use a solvent. TCE seems to work, available as LectraClean from CRC (available at Home Depot et al). --- Jeff
RE: [Repeater-Builder] Re: DB antenna question
Thanks Jeff, hadn't thought about the TCE (Trichloroethylene I think). I'll check HD next time i'm there. -- Doug N3DAB/WPRX486/WPJL709 Jeff DePolo [EMAIL PROTECTED] wrote: = I can't see ruining the bottom half of a good harness when I have top top half from another antenna that is been damaged that I can use. Last time I had to replace one of the connectors on a DB antenna the VB material in the cable either was still sticky or got that way from trying to solder the new connector on it and it was a real pain. Is there a trick to it that I don't know ?? Your idea about re-using an old harness from the top off of an antenna for the lower half of your dual makes sense. If you're using type N connectors (either crimp or mil clamp), the goop isn't a big deal, just crimp/clamp the braid with the goo on it, it will still make solid contact and help maintain weatherproofing. If you really want to get rid of it, use a solvent. TCE seems to work, available as LectraClean from CRC (available at Home Depot et al). --- Jeff
