IC-9700 News regarding ext. REF-IN (GPSDO)
Review from Stewart, ZL4DC
The firmware update was successful from v 1.06 to v 1.10. Hint... the final firmware update "OK" button requires a long press to activate; well at least it did in my case.
So before I implemented the new "Sync to REF IN" function I measured the frequency at 1296.6 MHz (FM carrier no audio) using my Anritsu S412E (with built in GPS - GPS locked hi accuracy reference). It was 12 Hz low and wondering around a bit (most disturbing); mostly seems to depend on the temperature of the IC-9700 which of course depends on the transmitter power and duty cycle.
After activating the "Sync to REF IN" (using an external 10 MHz GPSDO) and transmitting again the frequency was 1296.6 MHz ± 2 Hz over time.
From a cold start; IE. turn the radio on and start transmitting immediately after it has booted the radio started about 8 Hz high and slowly drifted down to 1296.6 MHz, I continued to transmit on high power until the radio timed out (10 minutes). The maximum frequency deviation was only 2 Hz but mostly the frequency stayed within 1 Hz.
(Does anyone know what the allowable/acceptable/recommended level of 10 MHz reference input to the IC-9700? It's not in the manuals so I'm using the IC-7610 value with is quoted at -10 dBm.)
This is a vast improvement on the initial offering. Finally I can sleep at night now.
PS. After reloading all of the settings from the SD card I was immediately able to remote control the IC-9700 with Icom's RS-BA1 V2 software; IE. I didn't have to tweak anything at all to get it going. Well done.
73 de HB9RYZ