[amsat-bb] SDR Front End Protection and Spin Modulation Fading

[Scott]

Hey Mike!

I've used the SDRPlay RSP1 as my full-duplex downlink receiver for quite a 
while now and it works very well. (both FM & SSB sats)

Filtering is not a bad idea, but is not mandatory.  In fact, the reason that 
I use the SDRPlay in this particular role is that it does much better 
against a 2m or 70cm uplink than the RTL-SDR or AirSpy R2 that I also have. 
Has no problem full-duplex w/ a 10m uplink for NO-84 PSK31 either.

-Scott,  K4KDR

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-----Original Message----- 
From: Mike N8MR via AMSAT-BB
Sent: Thursday, May 23, 2019 9:43 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] SDR Front End Protection and Spin Modulation Fading

I have an SDRplay RSP1 that I’d like to use as a downlink receiver, along 
with an Arrow 146/437-10 antenna and Yaesu G-5400 az/el rotators. Uplink 
will be an Icom IC-7000. Using this setup, will the SDRplay need a Front End 
Protector to keep it from overloading? If so, which ones are recommended?

Also, I am considering upgrading the antenna to an Alaskan Arrow. Is there a 
noticeable improvement in antenna performance and gain between the standard 
Arrow and the Alaskan? Would the improvement in gain also result in deeper 
fading during spin modulation?

73,
Mike, N8MR