On Sat, Jan 20, 2024 at 11:21 AM, Joerg DB2OO wrote:
Just want to make sure, that I interpret your changes correctly:
1. Remote display / control - required to free up enough pins for the rest of this list! --> will this be a serial interface, to allow communication between a PA and the tuner? This is what I am currently mainly missing.
2. Add Frequency detection - using some buffering, and hardware div 4, feeding into T1CLK --> Will the tuner store the last tune settings per band ( potentially in even smaller granularity) and start tuning on a new band with the stored settings? Again this would be a great improvement, as after having a fixed antenna tuned once per band it would essentially mean no real "tuning activities" required any longer, but just switching to the known configuration.
Instead of measuring frequency, frequency could also just be communicated from the PA/Transceiver through a serial interface.
1. Yes, I want to add a remote ATU interface, so the tuner can live near the antennas, and the remote unit lives near the amp/transceiver.
Initially just replicating what is there at the moment (but remotely over a few wires, probably using Cat5e/6 cable, as external grade ones are readily available).
But I would want to add the Icom/Yaesu/Kenwood interfaces.
2. Yes, we can fit 85 memories in the on-chip EEPROM (if we move the config values into Codespace), by just covering the amateur radio bands, this can give 25kHz resolution up to 25MHz, then 200kHz above that.? Using an external EEPROM (have some M24128 on order) would allow 10kHz resolution over the whole range.
I looked at using the transceiver output, but measuring the frequency is about US$1 of parts, and keeps things simple (especially for a remote tuner option).
Roger/GW6HRU
RogerW/GW6HRU