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

[Glenn Little WB4UIV]

How does this SDR perform in an RF rich environment?
Such as close to an AM broadcast station, close to a 2KW ham station, 
close to a short wave broadcast station, close to a diathermy machine, 
close to an RF heater (used in pressed board production)?
These are all real life conditions that a receiver with a real front end 
can handle well.

73
Glenn
WB4UIV

On 4/9/2018 11:04 AM, Robert Nickels wrote:
> On 4/9/2018 7:37 AM, Alberto di Bene wrote:
>>
>> Well, if saying "premium receiver" you mean some boat anchor of 30 
>> (or more) years ago, the discard immediately this my message.
>> If instead you are open to the new possibilities offered by the 
>> current state of the art, then I would suggest you to examine these
>> two receivers : 
>
> I too spent about 20 years (and much money!) on the quest for the 
> ultimate LF receiver, and I have many of those that have been 
> mentioned, including the R-389, SP-600VLF,  Racal and CEI models, as 
> well as marine receivers from ITT Mackay, Dymek, Sylvania and others - 
> and none of them can outperform a modern high performance SDR. As 
> Alberto noted there are several good choices, to which I would add the 
> SpyVerter R2 (which in full disclosure I am co-developer of) ahead of 
> the Airspy R2.    This combination has become my primary LF/VLF/MF 
> receiving choice because one of the design goals was excellent 
> performance below 500 Khz, which is obtained through a balanced 
> switching mixer and wideband design that extends to 9 khz.    There 
> can be little doubt that the term "premium" has been redefined with 
> the development of high performance SDR receivers.
>
> Obviously the receiver is only as good as the antenna it's connected 
> to, and I've found the original "Burhans" active whips to be vastly 
> superior to the miniwhips that have become popular in recent years.   
> Part of the advantage is due to passive filtering at the input of the 
> whip impedance converter which attenuates MF an HF signals, helping to 
> preserve the dynamic range of the receiver.
>
> 73, Bob W9RAN
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"