[Premium-Rx] Longwave Receiver Recommendations?

[Brooke Clarke]

Hi Clemens:

When my FRR-21 receives WWVB it sounds like a sledge hammer, that's to say a very strong output.
https://prc68.com/I/rack2.html

There are a number of devices which have specifications going down to 10 kHz that in fact do not perform well that low 
in frequency.
The Amrad Active Whip antenna is one example: https://prc68.com/I/LF-Ant.shtml#Noise
It allows noise on the power supply into the signal.  A battery can solve that.

Cubic receivers have been designed to work well at LF and below frequencies.
https://prc68.com/I/CubicR3030.shtml

Another key receiver parameter is IF bandwidth.  The narrower the better.  My narrowest true IF BW is 1 Hz in the 4395A 
Spectrum Analyzer.
The physical IF is 12 MHz but the I&Q DSP processing results in a minimal actual IFBW of 1 Hz.
https://prc68.com/I/4395A.shtml#SA

Technically LF is 30-300 kHz, but there are signals below 30 kHz.  See Frequency Assignments
https://prc68.com/I/FA.shtml#ULF

A converter works, but has a very wide front end so not as good as receivers with front end filtering.
https://prc68.com/I/CEI.shtml see control panel rear view where red box is Palomar Engineering LF converter.

Decades ago I got excellent results by resonating a long wire with a slug tuned Miller 3 mH coil.  The peak was very 
pronounced and made a world of difference.
I've heard good things about the Wellbrook loop, but have not tried one.
The McKay Dymec active whip works OK, but not as good as the above resonated long wire.
https://prc68.com/I/DR33.shtml#DA100

Excellent Resources:
https://www.lwca.net/
http://www.vlf.it/

-- 
Have Fun,

Brooke Clarke, N6GCE
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> And as long as we are mentioning boat anchors, let us not forget the RCA
> SRR-11, with its range of 14-600 kcs and its 28 soldered in tubes. (and
> wonderful mechanical construction). Used to have one but let it go, because
> I could not establish the requisite antenna.
>
> Clemens
>
> On Thu, Apr 2, 2020 at 2:31 AM Heinz Breuer via Premium-Rx <
> premium-rx at mailman.qth.net> wrote:
>
>> How about the AEG E 1800A, the later DSP version of the E 1800/3?
>> Also don’t forget the boatanchors R-389/URR, Telefunken E 108 LW and
>> Siemens E 311 e2 with E 350 longwave adapter or even a Lorenz Lo 6L39 which
>> is the longwave version of the pre WW II short wave receiver Lo 6K39. This
>> is a TRF receiver with six tuned circuits.
>>
>> I have several of the receivers above (unfortunately no Lo 6L39) but my
>> location in the middle of severe man made noise from my neighbors by
>> switchmode power supplies, Chinese cell phone chargers and powerline
>> ethernet adapters makes reception difficult.
>>
>> vy 73 Heinz DH2FA, KM5VT
>>
>>
>>
>> Von meinem iPhone gesendet
>>
>>> Am 02.04.2020 um 00:16 schrieb Edward via Premium-Rx <
>> premium-rx at mailman.qth.net>:
>>> Greetings to the Group!
>>>
>>> I have built up quite a collection of Premium Rx and would like to know
>> what you would consider as the ideal rx for reception of the Longwave band.
>> I have high hopes for this, as I put up a couple of antennas that are quite
>> suitable for LW. I am also in the Middle East and hope to hear some
>> Europeans and N African stations, plus NDBs.
>>> I plan to dedicate 3-4 Rx for this so pls give me your top 3-5 choices
>> from the following:
>>> -WJ HF-1000A
>>> -WJ 8711A
>>> -WJ URR-74
>>> -Harris R-2368
>>> -Racal RA-3791
>>> -Racal RA-6793
>>> -Racal RA-6790/GM
>>> -Hagenuk RX-1001M
>>> -AEG E1800/3 (aka Telefunken)
>>> -Telefunken E-1501
>>> -JRC NRD-93
>>> -JRC NRD-75
>>> -Drake RR-3
>>> -Collins 651-S1
>>>
>>> Plus some SDRs.
>>>
>>> Thanks & 73,
>>> Ed NI6S/7Z1ES
>>>
>>>
>>>
>>>
>>>
>>> ______________________________________________________________
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>>> Home Page:  http://www.premium-rx.org/
>> ______________________________________________________________
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>> Help Contact eMail:  radio at 8zo.com
>> Home Page:  http://www.premium-rx.org/
>>
> ______________________________________________________________
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