What signal are you using as the COS from the receiver? If you use RUS you will have a combination of the squelch and the CTCSS detect. The two are anded together so that both have to be present for RUS to be active.
If you are using only the detected CTCSS you will have the hangover you mention as it takes a short time for the detected tone to clear out of the filter and turn the detect output off. Typical operation using RUS and a CTCSS decoder is that the RUS signal will delay slightly going active as the tone decoder is locking on. Even though the CAS has gone instantly to active, this slight delay will be present due to the AND gate action. At the end of a transmission, the RUS will go inactive instantly, as soon as the CAS signal goes away, even though a CTCSS signal detect is still present. So RUS gives you the best of both signals, delayed keying (only a few tens of milliseconds) and a fast unkey (the squelch mod comes into play). I have several GE Mastr II base station repeaters operating and I have the squelch mod described on the Repeater-Builder site installed on all. They all perform as described, with a strong signal giving an instant audio shut-off and a weak signal giving a longer squelch burst to reduce the audio switching action with a picket fence signal. I normally use the RUS signal as the CTCSS detect into the controller, and the CAS signal as the COS. If you want to be able to disable the CTCSS requirement, this set up works very well. 73 - Jim W5ZIT --- On Fri, 9/19/08, kb5vjy <[EMAIL PROTECTED]> wrote: From: kb5vjy <[EMAIL PROTECTED]> Subject: [Repeater-Builder] Ge Mastr II Squelch To: [email protected] Date: Friday, September 19, 2008, 4:35 PM Greetings All, I have just put my second Mastr 2 repeater together and I would like to see if anyone has any input in the squelch circuit. I noticed on both of them that when users un-key their radios, there is about a half second white noise burst. I have preformed the M2 Squelch circuit modification by adding a 4.7uf at 35v cap c630 and replacing c631 (the second unit had c631 clipped out) Both of these units were mobiles now in station cabinets. Tuned 443.800 and 443.900. Thanks for the response and 73 de Joe KB5VJY ._,___
