Update.
Baluns are installed and work perfectly. No signal loss and no noise at line level over 80ft of cat5e. Basement Receiver and main floor AVR now fed by AVR in family room.
One iTach connected to RS232 port of RX-V2700. Serial settings not specified in manual but google search found the following:
Protocol: RS232
Baud Rate: 9600
Flow Control: CTS/RTS (Hardware)
Data Bits: 8
Parity: None
Stop Bits: 1
Roomie Remote App was good for quick tests, (I was able to quickly confirm operation of the iTach to the RXV2700) but you have to make extra purchases for each component you wish to control. They also moved to a subscription format, which has not made long time users happy.
iRule it is.
iRule programming. Definitely a learning curve. The tutorials help, but what would be nice is tips on what makes a good layout. After some stumbling and experimentation, I've decided on operating panels by "room", and pare down the controls to only the standard activities. It's pointless to clutter the screen with video controls when I mainly listen to internet radio while in the kitchen. You get the idea.
One nice feature of iRule is programing "gestures". With iRule app running, you can assign commands to taps and swipes on the screen. For example, I can double-tap the iPhone screen with one finger and mute the audio. A one-finger downward swipe drops volume by -20dB. Cool.
My biggest challenge is trying to transmit wireless audio upstairs. Since crawling around the attic with a broken leg on the mend is out of the question, I thought I'd try these:
and
Made by Channel Vision, they are 2.4Ghz transmitter/receivers.
Unfortunately, performance is unacceptable. After several re-locations, source output gain adjustments and channel selections, I just can't get a decent sound quality from them. Well, I did at one point, but they were only 10 feet apart. Sort of defeats the purpose. After extensive searches for an alternative brand, I have to say this method is a bust.
I have an extra Airport Express that I haven't unboxed. I was hoping to return it, but it looks like it will let me stream most of my stations by iphone to my bedroom. Of course, it will only stream Airplay compatible devices, which is mainly Apple products. This will all be moot once I'm able to run the proper wiring,
I have one more iTach to connect to my HTD, but I neglected to order a DB9 M/F serial cable. 10 years ago, this cable would have been easy to purchase at my local computer shop. No more. May as well gone looking for a buggy whip, which given our Mennonite population, would probably be more readily available.
Next step. Garage entertainment.