[Premium-Rx] Looking for recommendations on high performance VLF receiver.

[sm0aom at telia.com]

Most if not all medium to high-performance receivers designed and manufactured from the 1970s onward will
meet your requirements.

>From my European perspective, receivers like the Skanti R-5001S, R-8000, the ITT-Standard Radio CR300 and CR90/91 families
the Telefunken E1700 and E1800 series, Marconi H2550 and the Plessey PR-2280 are possible choices. 

The performance of any VLF/LF receiver will ultimately be limited by the combined ambient (atmospheric and man-made) noise, together with
the selectivity properities. 

Most of the current direct-sampling SDR:s are also very good performers, as they permit tailoring their selectivity curves at the user's discretion,
and some have noise-blankers operating in both the time and amplitude domains.

73/
Karl-Arne
SM0AOM







----Ursprungligt meddelande----
Från : n1bec at msn.com
Datum : 2018-04-09 - 08:06 (UTC)
Till : Premium-Rx at mailman.qth.net
Ämne : [Premium-Rx] Looking for recommendations on high performance VLF	receiver.

Hi Folks!


  I've been having a blast pulling in VLF aircraft beacons in the 200-525 K/c range.

  I am looking for recommendations for a premium receiver that will cover VLF. If it can cover say VLF to HF (maybe 10k/c - 30 Mc, that would be even better!)

  Due to the nature and spacing of the signals, selectivity is an absolute must!  Signals can typically be 2 K/c apart from each other, creating all sorts of heterodyne issues.

  My best receiver is the CEI-357 (R-1401): Sensitivity is good, selectivity is also quite good, but the noise blanker doesn't seem to work, and this a real performance killer (especially since we're getting into the noisy time of year!).

  The CEI-357 has 6 K/c, 3 K/c, 1 K/c, and 100 Hz filters. For VLF work, the 3 and 1 K/c filters are what I primarily use. The 1 K/c filter gets used the most. Being able to use a .5 K/c filter would be a huge asset for pulling in the Canadian beacons that have the 400 Hz modulation.

  Having the ability to go from AM to USB and LSB is also a huge plus: I bagged a beacon in the Caribbean (a 3900 mile path!) because I was able to switch to SSB and use a narrow filter.

  Thanks in advance for your suggestions.


-Tom
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