Might be able to wire in an NHRC DAD board...
Mike Besemer (WM4B) wrote:
>Greetings all,
>
>I'm restoring a lightning-struck Kendecom Mark 4 to use as a back-up
>repeater for our club. (Actually, I'm restoring two of them, but one is
>already done and on line... but I digress.)
>
>I've got the second machine up and running and it's been doing well on my
>bench for the past several days, but the one remaining problem I have is
>with the audio board. The delay line (Reticon SAD4096) is bad, and will not
>pass audio.
>
>I've jumpered around it so I now have a path for receiver and local audio to
>pass to the transmitter, but unfortunately this causes a problem with the
>autopatch. Without the delay line, the first short burst of DTMF audio
>passes to the phone line and is JUST long enough to cause the autopatch to
>misdial about 99% of the time. I know that this chip is pretty much
>non-existent any more but I thought that perhaps someone out there might
>just happen to have a spare they could part with. Short of that, perhaps
>somebody has a relatively simple (and CHEAP) solution to the problem...
>either a way to delay the audio just a fraction or to decrease the attack
>time of the muting circuit so it cuts that short DTMF burst off.
>
>As I said, this is our 2nd backup machine and other than the autopatch it's
>working fine, so I'm not willing to spend too much time or effort to get it
>100% capable, but if it's something relatively painless, I'll give it a try.
>
>
>As an aside, although I've been working professionally in electronics for
>the past 24 years or so (and been a ham for nearly 30) I've only recently
>become involved in repeater maintenance. This group has been a godsend and
>I appreciate all who have offered their advice and assistance. Through the
>suggestions I've received here, I was finally able to isolate an
>intermittent problem with our primary receiver to a faulty receiver (of
>course, it helps when the darn thing actually breaks when you're standing in
>front of it at the repeater site too!) and it's now on its way back to ACS
>for a FREE out-of-warranty repair. (Another BIG thanks to Gary at ACS for
>going out of his way to be helpful!)
>
>Thankfully too, the Mark 4 is well documented and very easy to repair. I
>really expected a mess when I opened them up, knowing that they had taken a
>good jolt via the phone line, but the repairs have been very easy and the
>parts (except for the darned delay line!) have been easy to come by.
>
>Thanks it advance to all & 73,
>
>Mike
>WM4B
>Kathleen, GA
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