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[IRCA] Fwd: [sdr-radio-com] Re: Front End Overload from AM Band using SDRPlay RSP-2
An interesting take on the latest SDRPlay radio, from the sdr-radio
list. MW overload may be an issue, so be warned.
best wishes,
Nick
Gents,
I have owned the RSP2 for a week now. I've also had an RSP1 for
several months. Up to this point I've been running the RSP2 on
HDSDR only because SDR Console didn't support that hardware. I feed
them both (RSP 1 and 2) with a full size G5RV (into either the SMA
input on the RSP1 or the Hi-Z input on the RSP2). My problem is
that I am bombarded by two different 50,000 watt AM broadcast
stations less than 8 miles from my QTH. The RSP1 handles the
situation rather admirably on all but 80 meters (that's as low in
the spectrum as I'm able to go as an amateur, I don't have a 160
meter antenna) but the RSP2 is hopelessly overwhelmed across all HF
bands. The MW/FM notch filter on the RSP2 has absolutely no effect
against the AM broadcast band overload (although it is very
effective suppression against the FM broadcast band, but that's not
where my problem lies). I have ordered a Morgan Mf g. (formerly
I.C.E.) M-400X AM band filter that I'm hopeful will eliminate the
overload problem with the RSP2. That filter should arrive later this week.
In the meantime, I've found that I can attenuate the input signal
from the G5RV sufficiently to at least suppress the severe overload
condition by attaching a 30 ohm resistor across the Hi-Z input
connections shared with my G5RV. It actually works quite well,
dropping the received signal strength roughly 15db and bringing my
RSP2 HF receive performance very close to that of my RSP1. Indeed,
the Hi-Z input appears to still be amazingly sensitive in the HF
bands despite the attenuation.
Just wanted to pass along what's been working for me, as far as
getting past the front end AM band overload on the RSP2. I'm not
sure why that unit is so much more sensitive to overload than the
RSP1, except that perhaps the RSP2 is designed to be sensitive down
to 1KHz signals and the RSP1 isn't advertised to be usable nearly that low.
73,
Mark KF5VQY
Nick Hall-Patch
Victoria, BC
Canada
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