May I please respectfully request that SOTA stations QSY from the calling channel on 4m (70.450MHz) once they have established a QSO ?
Because the band is very quiet it is easy to assume that no inconvenience is caused by working stations on the calling channel, but this is not the case.
One of the great things about 4m is that because most people have dedicated rigs, they are able to leave them monitoring 70.45 and hear stations calling CQ. Because of this, although there are fewer people on 4m than, say, 2m, a CQ call will usually result in a reply.
However, if people continue their QSOs on 70.45, it becomes more intrusive to people monitoring the channel e.g. while working, around the house, or perhaps tinkering in the shack. They will then turn their 4m rig off to get some peace and quiet.
In the long run, this means there will be nobody to answer your CQ calls when you are out activating, so it is very counter-productive.
Recently, there were two SOTA activators both working on 70.45 at the same time. They obviously couldn’t hear each other and the resulting QRM made the 4m calling channel unusable for some time over a very large area.
There are plenty of quiet channels on 4m, please don’t spoil this lovely band and give SOTA a bad reputation and alienate yourself and others. I have found 4m users an extremely friendly lot, who will take the trouble to reply to a CQ call when 2m has yielded nothing, in spite of being able to hear many stations calling their mates.