Re: Signal strength format
- --- In PCR1000@yahoogroups.com, Patrik Tast <patrik@...> wrote:
>OK. Here's what I found after some playing around.
> >Single 8 bit word, with a value from 0 to 128.
> That is wrong!
> 8 bits (one word) is in hex from 0x00 to 0xFF i.e. from 0 to 255
> in decimal (128 dec is the midpoint value 0x80 hex)
> Accordingly to the spec it runs from 0x00 to 0xFF (0 to 255)
> so 0x6A would be in decimal 106.
> To get the singal reading push command I2, in fast mode his is done
The outputs come as strings of individual ascii characters, and
there's other stuff as well.
Send in I1? to ask for a signal strength and assume the value is 6A
What comes out is <LF> "I" "1" "6" "A" <CR> <LF> or, in decimal,
10 73 49 54 65 13 10
GM4JJJ lists LD842? as being the same as I1? but on mine it's
different. On VHF FM, LD842? values start incrementing from around
-115dBm signal level whereas I1? values don't change until >-100dBm. I
think I1? values are related to the S meter indication whereas LD842?
is closer to the RSSI.