In reply to MM0FMF:
I should have said that I was using my VX7-R with its standard helical, so it may have suffered a little if I had connected a larger antenna, but from what I could hear anyway on the standard antenna, Freeholds Top is a very long way from being in the same league as G/SP-017 Billinge Hill or GW/NW-070 Great Orme.
I am very guilty, as I am sure many of us are of referring to receiver overload as QRM when I suppose that should only apply to man-made interference that is actually real. i.e., present regardless of the receiver in use rather than only existing due to a failure of the receiver circuitry to handle large signals near to either the frequency in use, or any of the receiver’s intermediate frequencies.
Being fore-warned is being fore-armed & I am sure there are many more summits that will swamp the receivers of the modern generation of wide band all singing all dancing handhelds than the two summits I have mentioned.
As suggested elsewhere on the reflector, it is well worth checking the summit information for a particular summit before setting off for an activation armed with only a handheld. You may be in for a shock when you find you can’t hear anybody calling you & your s-meter is reading S9+60db on all channels, especially if you have put a lot of time & effort into getting there.
Older radios such as the Yaesu FT290R cope well because they were designed & built to do one thing & one thing only. It was designed to only cover the 2 Metre amateur band with either SSB CW or FM. It did not have “extended receive” or “airband receive” or any of the other bonus features that virtually all modern amateur VHF transceivers have, & its filtering was designed accordingly.
I have to say, that despite hearing from several activators that the Yaesu FT817 could also cope well with Billinge Hill type signals, I had to see for myself, hence another reason for my “activation” very early the other morning. I had done some simple tests with my FT817 at home previously that indicated a sharp drop off in sensitivity once you move away from the 2 Metre band. This would indicate that the filtering has been designed with rejection of strong Having tested it “in the field” on Billinge Hill I have to say I was pretty amazed that a radio that does offer so much coverage, still coped admirably in very strong RF environment.
On a similar note, while I was on Billinge Hill I took a close look at a couple of the commercial masts & I have to say it must be a nightmare for a radio engineer to find the source of any breakthrough their equipment may be suffering. The layout of some of the antennas is “pretty mad” in my opinion, & I think there should be a least another lattice tower up there for some of the antennas to be correctly spaced. Maybe that’s why there does seem to be such a large number of antennas crammed in such a small space on the masts already there.
It would be interesting to know if the “QRM” on GW/NW-070 Great Orme, sounds the same as that on G/SP-017 Billinge Hill. I wonder if anyone who has activated, or tried to activate GW/NW-070 Great Orme with a 2 Metre handheld could confirm this?
My video of Billinge Hill “QRM” is here (again!) Sorry