MSF 5000 and replacing Spectra-TAC voter with Doug Hall

[wb4wxd]

I have a problem, thanks for listening.
We have an MSF 5000 repeater that was working with a Spectra-TAC
voter system which went bad. We are interfacing a Doug Hall voter
system with the MSF 5000 and have reached a stopping point. The new voter has been modified with a tone control board so that it creates all the control tones for the MSF 5000 line input in place of the old Spectra-Tac. It works fine BUT... Local audio from the repeater comes out line 2 and has the 2175 tone on it. When the voter uses external audio from a link radio, it keys the 5000 and the audio goes through like a champ. but when the audio is local from the repeater, the local receiver drops the 2175 tone but will pass no audio to the voter while the transmitter is keyed. When I remove the local receivers input (from my service monitor or a radio on the input frequency), the 2175 returns and everyting seems fine. If I remove the voter from line 1, the 5000 works like a regular repeater and passes local audio just fine.

I am sure this is proobably a setting in the software but I just need help in finding it to keep the local audio from muting during receive.

Thanks in advance for any help, I've got to get this fixed quickly.

Jeff
WB4WXD

[Dan562]

Every time I read your post, I wonder to myself which Model MSF5K you have C_ _CLB or a C_ _CXB7106_T? You never indicated how the Spectra-TAC T1786B comparator failed ... Surge or otherwise. Perhaps a Surge got it, then possibly that also hit your MSF5K too.

On the other hand, you could have your station's TRC board set up for 2 Wire Half Duplex rather than 4 Wire Full Duplex on the Wire Line (Yellow Berg Jumpers) which it should be.

I would take a scope probe connected to your service monitor, looking for either unsquelched audio noise or recovered 1 kHz audio tone from the station's receiver Wire Line terminals.

[wb4wxd]

Dan
Thanks for the reply. We are going down and check out both items you suggest and as the site is bout 40 miles away it takes a while to get there.
I am going to try and read the parameters out of the 5K and save them. We are kind of coming into this project with no previous experience with this unit. I was wondering if any of the Spectra-TAC settings in the programming (delay, etc) might have been changed/need to be changed.
Thanks for everybody's thoughts.

Jeff

[wb4wxd]

Thanks to all for your help, the problem turned out to be a setting that
somehow changed in the programming. The repeater was not set to
full duplex mode and thus shut off the local receiver when the repeater
keyed. We're at a loss why the setting changed, but happy that it was corrected

Thanks
Jeff

[bernie]

My two bits worth:
Why not repair the Spectra-Tac comparator?