[amsat-bb] Re: [htaprs] THD7 Signal Strength

[Robbie Robertson <rrobertson@xxxxxxxxxxxxx>]

Hi Bob, 

It was good to talk to you and I picked up some very good
tips from you I might add, thanks again..

However, I find it hard to believe what you say about the
packets received...

 Are all the packets that are hitting half scale and beyond
but not being decoded are over-deviated transmitters?  It
seems so when you listen carefully, 60-70 percent of all
packets have noise on thier signals, even though they are
reading high on the scale.. Curious...

73

Bob Bruninga wrote:
> 
> Doing this satellite stuff with the THD7, I decided to calibrate my
> Signal Strength indicator.  Here is the result, your mileage may vary:
> 
>             at 146 MHz   at 444 MHz  |   at 437 MHz
> SIGNAL       dBm   uv     dBm   uv   |    dBm   uv
> ---------   ----  ----   ----  ----  |   ----  ----
> *           -121  0.2    -120  0.22  |   -116  0.35
> ***         -117  0.32   -115  0.4   |   -112  0.56
> ****5       -113  0.5    -111  0.63  |   -107  1.0
> ****5*7     -110  0.7    -108  0.89  |   -104  1.41
> ****5*7*9   -105  1.3    -104  1.41  |   -100  2.24
> 
> Notice that it is a very good receiver for 2m and 440.  I can copy packets
> all the way down to -119 dbM which is quite good.  Being  optimized for
> the USA 440 band, it does loose about 3 dB in the satellite band.
> The narrower band European models have a different UHF filter, and do
> have the full sensitivity over their narrower 430-439 MHz band.
> 
> de WB4APR, Bob
> 
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-- 
---------------------------
Are we having fun yet?
Robbie - WA9INF
******* --... ...-- *******

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