[Repeater-Builder] Tait T-300 series VHF Repeater - Information Required, Narrow filters inside, want to use standard diviation for Ham Use
Hi All, I recently acquired a Tait T-300 VHF repeater unit. Looking at using it in one of our repeater installations. Got everything working, and appeared to be putting out all the correct levels, power etc. However, after a few days, I was advised that the audio seemed to be low on the out put. I went up to the site and checked the audio going into the controller(RLC-3), and this seemed okay. Did not have a deviation meter, so was not able to check the output level, but by ear it sounded okay. Anyway it was still low. Brought the modules down, and opened the modules. This is when I found out that inside the filter had the markings "21F 7.5 D H", which I worked out to be 21.4 IF, and 7.5 deviation. I would like to know if I can somehow make it, so it can be used as one of our ham repeaters? If so, what do I have to do to make this work as needed? And any other info that might be of help? Regards and Thanks Kevin. ZL1KFM. 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Tait T-300 series VHF Repeater - Information Required, Narrow filters inside, want to use standard diviation for Ham Use
Hi Kevin, I use a Tait 300 series on my 6m repeater. I have found that although the filter is technically correct for the 12.5KHz spec ( i.e 2.5KHz deviation max ) that few if any Amateur rigs are setup for this correctly out of the box. I have changed the filters in all of mine for 15KHz bandwidth filters. I know the purists will say that my signal to noise ratio is now not as good but it didn't make much difference in reality as 6m is such a noisy band anyhow. However the up side is that now all the users sound great. Before I changed the filter many stations sounded distorted due to the edges of the filter being exceeded by their deviation. Other than that, I have had no difficulty with the Taits at all, and used them for many years in my job as PMR technician. So to summarise, I would say all you needed to do is to change this filter - you might be able to find a filter that is out of something else that will fit as Tait no longer support the 300 series. I approached them to get a 15KHz filter and that's when I found that out! I ended up using a STC filter from a Pye R400 UHF link rx. Check out the pictures on my web site www.gb3fh.org.uk You'll spot the 300's there! Hope this helps. Matt G4RKY - Original Message - From: Kevin Natalia To: Repeater Builder Users Group Sent: Monday, March 28, 2005 10:20 PM Subject: [Repeater-Builder] Tait T-300 series VHF Repeater - Information Required, Narrow filters inside, want to use standard diviation for Ham Use Hi All, I recently acquired a Tait T-300 VHF repeater unit. Looking at using it in one of our repeater installations. Got everything working, and appeared to be putting out all the correct levels, power etc. However, after a few days, I was advised that the audio seemed to be low on the out put. I went up to the site and checked the audio going into the controller(RLC-3), and this seemed okay. Did not have a deviation meter, so was not able to check the output level, but by ear it sounded okay. Anyway it was still low. Brought the modules down, and opened the modules. This is when I found out that inside the filter had the markings "21F 7.5 D H", which I worked out to be 21.4 IF, and 7.5 deviation. I would like to know if I can somehow make it, so it can be used as one of our ham repeaters? If so, what do I have to do to make this work as needed? And any other info that might be of help? Regards and Thanks Kevin. ZL1KFM. 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Tait T-300 series VHF Repeater - Information Required, Narrow filters inside, want to use standard diviation for Ham Use
Hi there; You have got a T300 Narrowband repeater (12.5 KHz Channel spacing). The IF Filter that you have is for 7.5 KHz bandwidth rather than 15 KHz (Which is for 25 KHz Channel spacing). Unfortunately you have the last of the T355 receiver's and these were double conversion with 21.4 MHz IF's compared to the 10.7 MHz IF's. I may be in a position to get you some 25 KHz T300's as I am aware of some that are being replaced by T800 repeaters if you are interested. We used to go the other way with the older gear and whip in a xtal filter from the old Pye/Philips P135 Falcons to narrowband the RX modules and change some R and C on the food chain. I've grown up with these in NZ so if you need any help dont hesitate to give me a holler :-) [EMAIL PROTECTED] ZL4GB _ Gareth Bennett This e-mail is confidential, if you received this message in error, or youare not the intended recipient,please return it to the sender and destroy any copies.Thank you. - Original Message - From: Kevin Natalia To: Repeater Builder Users Group Sent: Tuesday, March 29, 2005 9:20 AM Subject: [Repeater-Builder] Tait T-300 series VHF Repeater - Information Required, Narrow filters inside, want to use standard diviation for Ham Use Hi All, I recently acquired a Tait T-300 VHF repeater unit. Looking at using it in one of our repeater installations. Got everything working, and appeared to be putting out all the correct levels, power etc. However, after a few days, I was advised that the audio seemed to be low on the out put. I went up to the site and checked the audio going into the controller(RLC-3), and this seemed okay. Did not have a deviation meter, so was not able to check the output level, but by ear it sounded okay. Anyway it was still low. Brought the modules down, and opened the modules. This is when I found out that inside the filter had the markings "21F 7.5 D H", which I worked out to be 21.4 IF, and 7.5 deviation. I would like to know if I can somehow make it, so it can be used as one of our ham repeaters? If so, what do I have to do to make this work as needed? And any other info that might be of help? Regards and Thanks Kevin. ZL1KFM. 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 the Yahoo! Terms of Service.
