RF-Kit RF2K-S firmware `vG91C109`

RF-Kit · Released Jul 30, 2021 · First seen Sep 7, 2026

vG91C109 is not the latest firmware for the RF-Kit RF2K-S: the current version is vG108C132 (January 9, 2022). Go to vG108C132

In short — summary by updatemystuff.com

Adds SunSDR TCI support and enables 6m band manual tuning.

Written from RF-Kit's release notes, which are printed in full below.

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RF2K-S SW G91C109 Release information and upgrade procedure

We would like to inform you that we released

which you can online upgrade starting today July 30.

With this release RF2K-S and RF2K+ with controller upgrade are the first amplifier who supports Expert Electronics SunSDR TCI command structure.

Release features:

SunSDR TCI support with frequency taken from EESDR
The Host IP address to use is not the SunSDR radio but the IP address of you PC with EESDR

6m Tuner usage now possible On 6m most antennas are mono-band antennas and don’t need much tuning.

Therefor only manual tuning is possible on 6 with limited L and C combination.

Up to 255nH and 51pF are allowed .

Due to the 100kHZ segmentation just a few settings are need to be stored to cover the 6 band.

On QSY Tuner will go automatically in AUTO if in MAN.

Minor bug fixing

Upgrade procedure:

This update can be installed using the build in update function.

Once upgraded you need to install TCI in the Interface / TCI - Menu

What’s next?

Amplifier TCI command structure extension as there are no TCI or CAT commands defined for amplifier.

Updating User Manuals to include latest changes.

At this point I would like to say thank you to the Expert Electronic team for their very professional support to get to this stage.

I also wish all SunSDR users fun with the new feature.

Vy73 de DH3NAB

Reinhard and team

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