Hi,
I’m looking for some advice regarding CAT performance when using an Elecraft K3 over RemoteRig RRC1258 in Twin mode with a PC-based control setup.
Setup:
Remote side: Elecraft K3 + RRC1258 (Radio unit)
Control side: RRC1258 (Control unit) + PC
Using Win4K3 for control (no physical K3/0 or K3/0 Mini)
A minimal Python script is used to emulate K3/0 presence (responding to PS;)
Observed behavior:
Win4K3 does connect and CAT communication is working
However, VFO tuning is very slow and jerky
PTT is delayed
In practice, the system is almost unusable due to the lag
Important comparison:
Using the same setup with RRC Micro → Win4K3 works perfectly (no lag at all)
Using flrig on the same RRC1258 CAT port → also completely smooth and responsive
So CAT itself is working correctly through the RRC1258, but Win4K3 becomes very laggy in this configuration.
Network latency is low and stable.
Question:
Is this behavior expected when using RRC1258 Twin mode without a physical K3/0 control head?
Is there any known difference in CAT handling between RRC Micro and RRC1258 that could explain this?
Are there specific RRC settings (COM mode, buffering, timing, etc.) that could improve responsiveness?
Additional info:
RRC COM2 mode: Mode-7 (CAT to COM2)
Baud rate: 38400 (same across K3, RRC and PC)
Firmware: (can provide exact version if needed)
Any insight from users running similar setups would be greatly appreciated.
Has anyone successfully used Win4K3 in Twin mode without a physical K3/0?
73,
HA5ATP
