Where to find Packet on 20 meter band 


The legacy network known as “Net105” is a reference to the lower sideband frequency 14.105 LSB that utilises 300 baud AX/FX.25 tone pairs configured at 1600hz and 1800hz respectively- 1700hz being the center frequency.

The network is still operational today, however our R&D requirements to expand and improve digital modes has meant we have planned and already utilise a companion allocation to do other modes while maintaining complete compatibility with Net105 network simultaneously, this helps to keep Net105 QRM-free from unwanted digital modes, while giving new users access to the FX.300 services provided there in a multimode digital set-up.

Many European stations run multiple modes as well as additional packet ’channels’ for BBS interlinks etc, these can be found only on the USB frequency as the multi modes such as VARA, ARDOP and Robust Packet are sideband sensitive and sit at a fixed center frequency of 1500hz. We hope our worldwide colleagues will adopt this expansion on the 20m band as well.

14.1022 USB

The USB dial frequency of 14.1022 has been selected to keep backwards compatibility with Net105 as well as provide an additional allocation to handle BBS traffic to help increase throughput, plus a 500hz corridor for robust modes such as RPR, VARA500, ARDOP500 and so forth.

If you are planning to migrate to this plan, the equivalent TNC tone pair for Net105 on the USB frequency is 1000hz and 1200hz, 1100hz being the center frequency, the additional AX/FX.25 300 baud allocation pair is at 1900hz and 2100hz (2000hz center frequency). This is obviously designed for adjustable tone-pair TNCs, hardware TNCs with fixed tone pairs will have to remain on the standard Net105 LSB frequency, so no changes there.

The various new-skool multimodes run at a fixed center frequency at 1500hz, with the packet channels described sitting on either side, depicted in this screenshot:

The multi platform ported version of UZ7HO soundmodem by G8BPQ.

You may want to try running QtSoundModem as it helps to visualise the spectrum with a waterfall.

Download QtSoundModem here.

Demonstration (no audio)