Thanks ALL,
The application is to have the RX Audio from the ICOM F521 transmitted simultaneously (slight delay) on the Kenwood TKR-750 and visa versa hence a link repeater application. I did some programming of ICOM for COS (Pin 6) and connected it to the Kenwood EPTT (Pin 16) and visa versa Pin 25 as COS on the Kenwood and connected it to the ICOM PTT (Pin 5) which allows both radios to be trigger whenever they RX signals. I have determine the following: 1. Pin 11 is TX Audio OUT of the Kenwood TKR-750 (confirmed) 2. Pin 10 is RX Audio IN on the Kenwood TKR-750 (to be verified) 3. Pin 3 is TX Audio OUT of the ICOM F521 (confirmed) 4. Pin 4 is RX Audio IN on the ICOM F521 (to be verified) When I apply Kenwood TX Audio (Pin 11) to Icom (pin 4) and Icom TX Audio (pin 3) and externally key up either repeaters No audio seems to pass, however the PTT is triggered when keyed. Attach is a programming scenario I got from ICOM support yesterday, obviously they will not offer any interfacing avice on the Kenwood. Note: I have a Zetron 38-Max repeater could I bridge the application via this? Any thoughts or comments. John From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck Sent: Thursday, April 03, 2008 8:54 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Linking a Kenwood TKR-750 to an ICOM IC-F521 At 07:42 AM 4/3/2008, George Henry wrote: The connection information in the following link may prove helpful: < <http://www.repeater-builder.com/kenwood/rc210-to-tkr.pdf> http://www.repeater-builder.com/kenwood/rc210-to-tkr.pdf> Receive audio appears to be pin 10, not 11, and pin 16 is the PTT input for the Kenwood, not an output. You need to feed either the TOS output (pin 24) or COS output (pin 25), to an inverter that then pulls the PTT of the Icom low. <----A couple of things here. First of all, Pin 10 is "RA" audio, Kenwood's nomenclature for deemphasised audio whereas pin 11 is, essentially, discriminator audio. Whether or not this is the one he wants depends on how TX audio is being fed to the Icom. As for COR out (or TOR), the TKR needs to be programmed to supply that and should be done as active high. My suggestion is to use Aux In/Out 5 and/or 6. I do agree he should use a buffer transistor to the Icom's PTT input to protect the TKR. Also, PTT Priority needs to be programmed for the TKR so it will respond appropriately to its own repeat PTT and the external one Ken ---------------------------------------------------------------------------- -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net <http://www.irlp.net/> "We don't just make 'em. We use 'em!"
