[Premium-Rx] Premium-Rx Digest, Vol 161, Issue 7

HL Serra hlserra at gmail.com
Thu Apr 2 11:26:53 EDT 2020 

I have a Racal 6790/GM which I love, and Dan AC6AO (a Racal guru) installed
for me the additional front end board made specifically for VLF work.
Local noise levels here in San Diego have increased, but with the board I
can receive many listed VLF stations even from as far away as Antarctica
with my little PA0RDT active antenna.
I also suggest people read all The Dallas Files <
https://groups.yahoo.com/neo/groups/thedallasfiles2/info> where noted SWLer
Dallas Lankford has many ideas, gear modifications and filters related to
LF work.
73, Larry N6NC

On Thu, Apr 2, 2020 at 8:11 AM <premium-rx-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. Preferred LW receiver (u)
>    2. Re: Longwave Receiver Recommendations? (pat1mca at aol.com)
>    3. Re: Longwave Receiver Recommendations? (Bruce Gentry)
>    4. Re: Longwave Receiver Recommendations? (sm0aom at telia.com)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 2 Apr 2020 14:03:33 +0000 (UTC)
> From: u <klezmer at optimum.net>
> To: "premium-rx at mailman.qth.net" <premium-rx at mailman.qth.net>
> Subject: [Premium-Rx] Preferred LW receiver
> Message-ID:
>         <
> 2E6EE96B650C32F0.0bbe8a34-bc62-4a9e-9aa6-9c02d3deca6e at mail.outlook.com>
>
> Content-Type: text/plain; charset=us-ascii
>
> I really like my Racal RA-6790/GM, which has the EPROM to take it down to
> DC and a very useful set of filters. The audio section of this receiver is
> simply superb. Feeding it with a Wellbrook loop just off ground level.
> Ken, KC2YRJ
> Sent from Outlook Mobile
>
> ------------------------------
>
> Message: 2
> Date: Thu, 2 Apr 2020 14:07:46 +0000 (UTC)
> From: pat1mca at aol.com
> To: premium-rx at mailman.qth.net
> Subject: Re: [Premium-Rx] Longwave Receiver Recommendations?
> Message-ID: <917118170.972719.1585836466160 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
>  Greetings List Members,
> Rather worryingly, over the last 50 years, I have owned/used/repaired 75%
> of Ed's listed receiver group.
>
> I absolutely agree with Karl-Arne concerning the AEG E1800/3 and also with
> Heinz concerning the later, rather unobtainium, DSP E1800A.
>  Few realise just how good the low noise performance of the AO1700
> "Synthesise" Local Oscillator actually is in those receivers. That fact and
> the +40dBm 3Ip at 20kHz spacing makes them probably the best of the LF/MF
> "old style" receivers.
>
> However for LW the Eddystone, Redifon and Racal 177x series receivers are
> good candidates. I used a number of EC958s on board ship and was always
> impressed with the LW performance despite their rather dated first mixer.
> The accompanying HF performance of many older Marine receivers could only
> be described as usable whereas the MF/LF/VLF side was usually quite good.
>
> These days I would probably go for an SDR like the Perseus (excellent for
> PN measurements? !!!) or Reuter RDR with an external additional Preselector
> such as a Racal MA197 or a Plessey SURF.
>
> As usual the local QRN level now limits the receive performance, something
> that was usually missing out at sea !
> 73 de Pat G3YFK
>
>
>
> -----Original Message-----
> From: Edward via Premium-Rx <premium-rx at mailman.qth.net>
> To: premium-rx <premium-rx at mailman.qth.net>
> Sent: Wed, 1 Apr 2020 23:16
> Subject: [Premium-Rx] Longwave Receiver Recommendations?
>
> 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
>
>
>
>
>
> ______________________________________________________________
> Premium-Rx mailing list
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> Help Contact eMail:? radio at 8zo.com
> Home Page:? http://www.premium-rx.org/
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 2 Apr 2020 10:15:39 -0400
> From: Bruce Gentry <ka2ivy at verizon.net>
> To: "premium-rx at mailman.qth.net" <premium-rx at mailman.qth.net>
> Subject: Re: [Premium-Rx] Longwave Receiver Recommendations?
> Message-ID: <cd295adb-200a-ccc8-116b-30a2ef4acddc at verizon.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> How about the RAK and RBA ?    They are ancient TRF boatanchor receivers
> with regen detectors, but many people have been amazed at how well they
> can perform. There is no mixer noise or birdies, unless you turn the
> regen up too much.  I had one about 50 years ago, and with a good
> antenna it was amazing.   In many ways, especially it's internal noise
> floor, it  was better than an R-389.
>
>        Bruce Gentry, KA2IVY
>
>
> On 4/2/20 7:38 AM, Clemens Ostergaard wrote:
> > 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
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ______________________________________________________________
> >>> Premium-Rx mailing list
> >>> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> >>> Help Page: http://mailman.qth.net/mmfaq.htm
> >>> Post: mailto:
> >>> Help Contact eMail:  radio at 8zo.com
> >>> Home Page:  http://www.premium-rx.org/
> >> ______________________________________________________________
> >> Premium-Rx mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> >> Help Page: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Premium-Rx at mailman.qth.net
> >> Help Contact eMail:  radio at 8zo.com
> >> Home Page:  http://www.premium-rx.org/
> >>
> > ______________________________________________________________
> > Premium-Rx mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> > Help Page: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Premium-Rx at mailman.qth.net
> > Help Contact eMail:  radio at 8zo.com
> > Home Page:  http://www.premium-rx.org/
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 2 Apr 2020 17:10:57 +0200 (CEST)
> From: "sm0aom at telia.com" <sm0aom at telia.com>
> To: premium-rx at mailman.qth.net
> Subject: Re: [Premium-Rx] Longwave Receiver Recommendations?
> Message-ID:
>         <132608673.244269.1585840257617.JavaMail.defaultUser at defaultHost>
> Content-Type: text/plain; charset=UTF-8
>
> TRF receivers work as good as others, as long as their limitations are
> understood.
>
> Regarding the actual performance differences, the main aspect for a LW
> receiver
> is the selectivity. Sensitivity or noise figure are secondary, as long as
> the antennas are above "minimum size".
> When a reasonable compromise of antenna size is made, the large-signal
> performance is also somewhat secondary, as long as you do not live
> "next-door" to a transmitter site.
>
> In my soon 40 years of professional practice, long-wave receivers have
> mostly been encountered in maritime/naval and SIGINT roles.
>
> In the maritime services they were mostly used for 500 kHz watch-keeping
> or traffic channel,
> with quite small antennas, often long-wires or active antennas, the SRT
> AA300 was one common type.
>
> The most common receivers were Drake RR-1 and Skanti R-5001s.
> When the networks were reorganised, the RR-1 became phased-out and we
> standardised on the R-5001 for
> fixed frequency use and the SRT CR302 for frequency-agile use.
>
> Naval users had the Racal RA-117 with the LF converter RA-137 well into
> the 80s, but they were phased out
> in favour of the CR302 during the late 80s.  Submarine communications used
> RA-117 + RA-137s and some custom-built receivers for receiving
> shore-to-ship broadcasts.
>
> When submarine LF/VLF Morse broadcasts were abandoned in favour of MSK
> some 20 years ago,
> the Navy purchased a British-made high-performance receiver+modem system
> from a manufacturer whose name has escaped me.
>
> Most SIGINT people with interest in LW used the receiving system
> integrated in the Plath Watson-Watt DF equipment,
> sometimes supplemented with CR302 or CR91 receivers.
>
> If there are many strong out-of-band interferers, it is advisable to have
> a tunable preselector in-front, such as the one integrated into the Skanti
> R-5001.
>
> It was impossible to distinguish any performance differences by just
> listening,
> comparing the R-5001 and the SRT PS300 and CR302 combination on long-wave,
> despite the 1:4 price difference.
>
>
> 73/
> Karl-Arne
> SM0AOM
>
>
> ----Ursprungligt meddelande----
> Fr?n : premium-rx at mailman.qth.net
> Datum : 2020-04-02 - 16:15 ()
> Till : premium-rx at mailman.qth.net
> ?mne : Re: [Premium-Rx] Longwave Receiver Recommendations?
>
> How about the RAK and RBA ?    They are ancient TRF boatanchor receivers
> with regen detectors, but many people have been amazed at how well they
> can perform. There is no mixer noise or birdies, unless you turn the
> regen up too much.  I had one about 50 years ago, and with a good
> antenna it was amazing.   In many ways, especially it's internal noise
> floor, it  was better than an R-389.
>
>        Bruce Gentry, KA2IVY
>
>
> On 4/2/20 7:38 AM, Clemens Ostergaard wrote:
> > 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
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ______________________________________________________________
> >>> Premium-Rx mailing list
> >>> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> >>> Help Page: http://mailman.qth.net/mmfaq.htm
> >>> Post: mailto:
> >>> Help Contact eMail:  radio at 8zo.com
> >>> Home Page:  http://www.premium-rx.org/
> >> ______________________________________________________________
> >> Premium-Rx mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> >> Help Page: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Premium-Rx at mailman.qth.net
> >> Help Contact eMail:  radio at 8zo.com
> >> Home Page:  http://www.premium-rx.org/
> >>
> > ______________________________________________________________
> > Premium-Rx mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> > Help Page: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Premium-Rx at mailman.qth.net
> > Help Contact eMail:  radio at 8zo.com
> > Home Page:  http://www.premium-rx.org/
>
> ______________________________________________________________
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> Home Page:  http://www.premium-rx.org/
>
>
>
> ------------------------------
>
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> End of Premium-Rx Digest, Vol 161, Issue 7
> ******************************************
>

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