s-meter useless?
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| Jan 31st 2022, 08:02 | |
texsalernoTotal Topics: 0 Total Posts: 0 |
I recently received a Yaesu FT-7900R transceiver in the mail. Setting it up I find it reads 9 every signal received. Have I missed something in the manual? No way every transmitting station near or far is a S-9. Any suggestions how to use this S-meter? A setting I can change? Or just out of luck? Reviewed as the best mobile transceiver in the U S and the most popular with Hams. Not so popular with me. |
| Jan 31st 2022, 08:30 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
This radio is popular because it has a high resistance to intermod, something that is hard to do. But, as our 2010 Product Review noted, this is an update of a radio reviewed in 2004. Back then most hams accepted that S-meters weren't accurate. Yaesu had no spec for S9. We measured 5.3uV on 146 MHz and 6.3 uV on 440MHz. An SDR design can provide much better S meter accuracy, but a hybrid design with expensive filtering is needed to get both good IMD performance and an accurate S meter. As far as I know this is only done with the most expensive base stations. Zak W1VT ARRL Senior Engineer |
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