Add a simple NPN transistor (and two resistor) inverter between the CAT and the TS32. Don't fight it, just put on your Borg hat and adapt.
Of course you know that the CAT only enables its transmit PL when there's a valid COR signal on the input. You won't get PL activated on CW ID, courtesy beep, or anything else. For all that, you might as well just wire your receiver COR to the TS32 and bypass the CAT controller. Bob M. ====== --- On Thu, 9/11/08, kk2ed <[EMAIL PROTECTED]> wrote: > From: kk2ed <[EMAIL PROTECTED]> > Subject: [Repeater-Builder] Comspec TS32P encoder control > To: [email protected] > Date: Thursday, September 11, 2008, 12:58 PM > Has anyone controlled the encode function of a TS32P via a > CAT > controller's encode logic pin? > > I've wired several SCOM 7330s and Arcom RC210s to > factory encoders in > MS2000s, Micors, and even outboard TS32 encoders. The Scom > and Arcom > controllers can be configured to set their encode logic for > either > active high or active low (active high needed for the > aforementioned > units); however my latest project utilizes a CAT200 > controller, which > only supports active low. > > In the past I've used the logic pin to ground the input > of the op-amp > stage on the TS32's encoder, effectively shutting off > the encoder. > However, since the CAT controller is active low, that > won't work, as > the logic needs to be active high for the op-amp's > input to pass. > > I don't prefer to use a relay or audio gate switch on > the TS32's > output because the impedance load of the encoder affects > the overall > exciter deviation. If anyone has played with Micors or > MSRs, you > know that adding or removing the encoder output from the > exciter > changes the load on the modulator stage, resulting in > varying repeat > audio deviation levels depending on the state of the > encoder > connection (even with zero tone level, ex: reed pulled). > Hence the > reason the factory boards control the encoder BEFORE the > final tone > output. The final impedance load of the encoder is still > present at > all times, with or without encode tone present. > > I also can't just switch the ground of the TS32 board, > as it is being > used as a full time decoder as well. > > Before I add some inverting logic between the CAT > controller and the > TS32, does anyone else have any ideas? > > Eric > KE2D
