Ah ok - shame about the 50% price hike 
Amazon was really convenient, even if you could re-stock just one European Amazon it would be good.
Just noticed they are now available through http://www.rtl-sdr.com/. Cost $24.95 USD, including free shipping worldwide.
Just a quick question, if I were to upgrade from a ProStick to a Prostick Plus would this require any additional setup or would it use the same PiAware setup and report to the same Feeder id on FA?
If you’re only using 1 dongle then it is simple to swap out (plug and play) with no configuration changes. Your feeder site ID will not change.
If I am not mistaken it is said that some will benefit from the additional FA filter even with this built in filter of the Pro Plus. Is that correct? How do I know if I would benefit from the additional filter?
In practice the built-in filter will tend to help extend the range (weak signals) but does not protect from overloading the front-end (it’s not designed to do that). Many users still benefit from the external filter because it reduces the overall RF noise input to the radio, which is a big issue for users in urban areas or otherwise near powerful radio transmitters. Unfortunately, without knowing the RF noise floor at every installation location, we can’t predict conclusively what configuration will work for you. If you’re the very rare person with access to a spectrum analyzer, you can do some investigation on your own in advance to try to predict what you need or don’t.
I also faced this problem. I dont have spectrum analyzer, so I used another primitive, but time proven method: trial & error 
, and it solved my problem.
I ordered it from Amazon and it will be here Sunday. Let’s do this!
Stood up my Pro Stick on my old pi running 2.1. Tripled my stats…
Wow…
Can you elaborate on what you mean by “stood up”? Sorry…newb here.
Replaced the three year old norco dongle w the pro stick and filter. Made no other changes and still running 2.1 on my three year old pi.
Received my ProStick+ on friday, and fitted it on Saturday. so far a mixed result as Satuday/Sunday are quiet days. I ahve noticed today that MLAT reports are lower than “Other” so far, which is not usually the case.
Setup is as follows: ProStick+FA Filter+FA 26" Antenna. I am going to leave this for a few more days to check from last weeks stats, before trying something else.
Is there any definitive way of knowing you are overloading the receiver? Any linux commands?
login in and run type “uptime” It’ll give you a rough idea on load. Since I put in the ProStick, I went from .5 or so to close to 1 on my old pi A. I want to put up the new B I have with the new software but I am waiting for the point where I can migrate a MAC based site to a site id based site.
uptime gives a one line display of the following information. The cur‐
rent time, how long the system has been running, how many users are
currently logged on, and the system load averages for the past 1, 5,
and 15 minutes.
This is the same information contained in the header line displayed by
w(1).
System load averages is the average number of processes that are either
in a runnable or uninterruptable state. A process in a runnable state
is either using the CPU or waiting to use the CPU. A process in unin‐
terruptable state is waiting for some I/O access, eg waiting for disk.
The averages are taken over the three time intervals. Load averages
are not normalized for the number of CPUs in a system, so a load aver‐
age of 1 means a single CPU system is loaded all the time while on a 4
CPU system it means it was idle 75% of the time.
ok thanks for that.
pi@piaware:~$ uptime
14:36:08 up 14:30, 1 user, load average: 0.31, 0.37, 0.40
You’re good…
Is there a way to do this remotely from the Pi? I have my pi remote mounted and powered over POE. It’s not easily accessible.
That is a completely different kind of “load”.
Overloading the RF frontend with strong interfering signals, as discussed in this thread, often leads to much fewer packets being decoded, giving a very low cpu load.
So, this number tells absolutely nothing about the need for external filtering.
/M
My interpretation was “CPU” based off the ask for a Linux command. Have at the radio fun. Tweaking that is far from my wheelhouse.
This whole thread is about RF filtering (added to the PS+), noise floors, and RF front-end overload.
/M
Really? I thought it was about “Announcing the Pro Stick Plus”