WA2ZKD

if the RPi PSU is a switcher, that is the source of the noise

If I am interpreting the sdr.hu data correctly, there are now 366 KiwiSDR available for public access. That's good news. A few "holes" in the coverage however that if filled would be great for TDoA usage. Alaska for example.

Thanks to all who contribute there resources for public use.

This has been discussed here and on net. Here's a simple way to reduce spurious from your shack going back up the feedline and into the antenna. I used a CATV lightning block and mix-31 ferrites. That point is about mid-point on my feedline to active magnetic loop

you can delay the load from being applied to the PSU with a simple relay.

AI6VN's wsprdaemon.sh code really works well. The #1 wspr reporter in North America as of late, KD2OM, runs 2 8-channel kiwis and cover all 14 bands

I have the Grove stuff working.... I just installed the latest debian stretch release. Obviously, as it needs stretch, my work so far has been on a bare BBG, not a kiwi

Ron, look at the Degen/Kaito MS-31 type loop

I would suggest you use Rob's 2nd computer scheme. It was kiwiwspr.sh but now wsprdaemon.sh. It will service all kiwi channels without any issues.

I note that the high-quality shielded Cat cables have the drain wire tack soldered to the metal clip at the plug. Sadly, I have also found that "professional" installers often do not even deal with the drain wire on installations in businesses.

Perhaps this helps

Usage: kiwirecorder.py [options]

Options:
-h, --help show this help message and exit
--log-level=LOG_LEVEL, --log_level=LOG_LEVEL
Log level: debug|info|warn|error|critical
-q, --quiet Don't print progress messages
-k SOCKET_TIMEOUT, --socket-timeout=SOCKET_TIMEOUT, --socket_timeout=SOCKET_TIMEOUT
Timeout(sec) for sockets
-s SERVER_HOST, --server-host=SERVER_HOST
Server host (can be a comma-delimited list)
-p SERVER_PORT, --server-port=SERVER_PORT
Server port, default 8073 (can be a comma delimited
list)
--pw=PASSWORD, --password=PASSWORD
Kiwi login password (if required, can be a comma
delimited list)
-u USER, --user=USER Kiwi connection user name
--launch-delay=LAUNCH_DELAY, --launch_delay=LAUNCH_DELAY
Delay (secs) in launching multiple connections
-f FREQUENCY, --freq=FREQUENCY
Frequency to tune to, in kHz (can be a comma-separated
list)
-m MODULATION, --modulation=MODULATION
Modulation; one of am, lsb, usb, cw, nbfm, iq
--ncomp, --no_compression
Don't use audio compression
--dt-sec=DT Start a new file when mod(sec_of_day,dt) == 0
-L LP_CUT, --lp-cutoff=LP_CUT
Low-pass cutoff frequency, in Hz
-H HP_CUT, --hp-cutoff=HP_CUT
Low-pass cutoff frequency, in Hz
--fn=FILENAME, --filename=FILENAME
Use fixed filename instead of generated filenames
(optional station ID(s) will apply)
--station=STATION Station ID to be appended (can be a comma-separated
list)
-d DIR, --dir=DIR Optional destination directory for files
-w, --kiwi-wav Use wav file format including KIWI header (GPS time-
stamps) only for IQ mode
--kiwi-tdoa Used when called by Kiwi TDoA extension
--tlimit=TLIMIT, --time-limit=TLIMIT
Record time limit in seconds
-T THRESH, --threshold=THRESH
Squelch threshold, in dB.
-g AGC_GAIN, --agc-gain=AGC_GAIN
AGC gain; if set, AGC is turned off (can be a comma-
separated list)
-z ZOOM, --zoom=ZOOM Zoom level 0-14
--wf Process waterfall data instead of audio
--snd Also process sound data when in waterfall mode