A good communications receiver will have a noise floor less than -125 dBm but the antenna noise is usually well above that level.
that goes on 10 meter as well.
The jitttery unprofessionally made video showed me nothing else as the claim of the maker.
On H.F. sensetivety isn't the holy grail, since atmospheric noises and antenna noise will be higher as what you could archieve in front end building.
2 meter or 70 cm's yes it has a reason to go for a good front end with low noise.
On H.F, 160 - 10 meters other demands are at play,
Here in Europe other situation arises.
The demands made on a short wave receiver when used in the western hemisphere, and particularly in Europe, are great indeed. Such a receiver has to be capable of resolving weak signals in a welter of almost unbelievably strong transmissions, and provide high sensitivity at the same time as high immunity to overload.
Most CB transceivers have the double conversion receiver which all don't differ that much from each other.
I wasn't impressed to be honest.
Has your "real world testing" Involved one of Marks radios?The fact that the person did those mods on an export radio is just a waste. At least do it on a CB radio.... you're taking a radio that is designed to operate from 28 to 29.7 mhz and modding it to perform in an area that's better than a full 1mhz BELOW its designed parameters (Channel 1 starts at 26.965). A CB radio has better sensitivity stock than a stock export radio has after modification into the CB band. That's in real world testing and comparisons that I have performed.
I've said for years that if you want best performance on the CB band, get a CB radio. They're designed to run in the CB band. Even if a person wants to run in the "freeband", such as 27.555, that's far closer to CB territory (150khz) than it is to 10M territory (750 khz, since 10M voice starts at 28.300). Again, a waste if you do all those mods on an export.
~Cheers~
Incoming Region Produces X3 Solar Flare |
May 15, 2024 @ 14:55 UTC |
Another major solar flare, but this time from an active region just beginning to turn into view off the east limb. It is possible that the group responsible is old AR 3654 from the previous rotation. The latest flare, an X2.99 event just peaked at 14:38 UTC (May 15). Stay tuned |