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G7NKS. testing my revised Hafler PA set up. 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The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hi Alan Thanks for the very useful insights here. I agree that is almost certainly locally generated hash. When I’m back from my imminent 4 week work trip, I’ll start the “hunt” with best regards [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [40.92.72.19 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (jim.cowburn[at]outlook.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 01bbe366c6256c79a1025d55a83a32a6 Subject: LF: RE: Re: running a quick test beacon on 472.9. G7NKS. testing my revised Hafler PA set up. Content-Type: multipart/alternative; boundary="_000_DB5PR10MB01195BD2D40857BA11F29543EC780DB5PR10MB0119EURP_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_50_60,HTML_MESSAGE, TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false --_000_DB5PR10MB01195BD2D40857BA11F29543EC780DB5PR10MB0119EURP_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Alan Thanks for the very useful insights here. I agree that is almost certainly= locally generated hash. When I=92m back from my imminent 4 week work trip= , I=92ll start the =93hunt=94 with best regards Jim Dr. Jim Cowburn G7NKS IO92ub Biggleswade UK Details on QRZ.com From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacks= heep.org] On Behalf Of Alan Melia Sent: 10 June 2018 22:18 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: running a quick test beacon on 472.9. G7NKS. testing my re= vised Hafler PA set up. Jim sadly the answer is not really a ''low noise antenna'' (try a dummy lo= ad if you are determined :-)) ) I am afrain the first thing to do is find the source of the noise and try t= o kill it. The first thing to do is check your own premises by sitch the s= upply master switch off. Listen on battery powered rig and note the reducti= on. At the levels you are quoting I am sure some of this is self generated.= I got my mean noise levells downto a couple of microvolts from a 10m verti= cal alongside the house with 130m of top-load. A waterfall plot is quite useful for diagnosing possible sources. Do this before you expend any time money and effort on something that may w= ork well for someone else. (NB mini-whips were developed for a specific app= artment problem where ferro-concrete was the build material......they dont = necessarily work with our brick walls.) A loop can be very useful for DFing the sources, but did not work for recep= tion for Roelof. I started quieting my station around the late 1990s. Ok it has got worse in= some areas but better in others. Small SMPSUs often operate way higher tha= n 136kHz now, but many previously quiet ''white goods'' was SMPoer controll= ers for efficiency eg fridges and freezers, not to mention the IoT. Many SM= PSUs create more RFI when ''off' that when powering something. By ''off'' I= mean in standby......TVs can be bad for this I moonlight on the RSGB EMC committee so have some experience and useful co= ntacts. Best Wishes Alan G3NYK ----- Original Message ----- From: James Cowburn To: rsgb_lf_group@blacksheep.org Sent: Saturday, June 09, 2018 5:46 PM Subject: LF: running a quick test beacon on 472.9. G7NKS. testing my revise= d Hafler PA set up. Can see it on B'ham grabber. thanx fer any other report= s Hi All running a quick test beacon on 472.9. G7NKS. testing my revised Hafler P= A set up. Can see it on B'ham grabber. thanx fer any other reports. Mess= age repeats every 5 mins @ 5wpm. Will leave it running for couple of hours or so approx 0.5W erp from a 10m vertical with 3 x 30m top wires (running NW away= from vertical ) ELAD FDM duo 0dBM output into cheap EBAY 1w broadband amp into Hafler 9505= as per W1TAG designs etc. Will give WSPR a run later but having the devils own job with getting WSJT-= X to be stable, keep getting the =93hamlib dll =93 error after a couple of = cycles. Very frustrating . Also getting the ELAD to talk to HRDv5 and DM780 was a nightmare, but event= ually solved with virtual audio cables etc but certainly not intuitive or e= asy. Strangely, the Hafler P4000 puts out a bit more power as =93stock=94 than t= he 9505 so am thinking about removing the feedback cap as discussed in the = various W1TAG pages but can=92t seem to work out how to open the case of th= e 9505! Jay/John =96 any tips? Is it the allen bolts? Next thing is to lower S7-S8 noise on separate Rx antenna. Have tried usin= g Tx antenna which is 15m away from house but top wires go over house and s= o are prob picking up noise. Current separate Rx antenna 10m vertical and = 3 x 30m top wires also pass over house. Any suggestions as to a good low noise Rx antenna most welcome. I=92ve tri= ed a miniwhip but even when remote mounted on wooden pole with earthed brai= d at house entry it is still s8 noise. G3XIZ suggests a loop, he=92s proba= bly right, but any other =93quick and dirty =93 ideas appreciated The ELAD via the 0dBm is excellent as an exciter and will generate RF down = to 5khz, so after some judicious coil winding, I=92ll be trying LF again an= d then the heady lows of VLF. My best previous Dx on 8.9khz being 500m! (= thats metres not km!) I may try Roger=92s G3XBM earth loop set up, but last time it didn=92t work= well but as I=92m out =93in the boonies=94 ~I don=92t think I have much in= the way of =93buried Utilities assistance=94 Cheers for any reports Mal (KEV) you must be able to hear me with your monster set up in Scarbs!! with best regards Jim Dr. Jim Cowburn G7NKS IO92ub Biggleswade UK Details on QRZ.com --_000_DB5PR10MB01195BD2D40857BA11F29543EC780DB5PR10MB0119EURP_ Content-Type: text/html; charset="Windows-1252" Content-ID: <5C58596B7BFC1B43ABB8A0E885A5B4E1@EURPRD10.PROD.OUTLOOK.COM> Content-Transfer-Encoding: quoted-printable

Hi Alan

 

Thanks for the very us= eful insights here.  I agree that is almost certainly locally generate= d hash.  When I=92m back from my imminent 4 week work trip, I=92ll sta= rt the =93hunt=94

 

with best regards=

 

 

Jim

 

Dr. Jim Cowburn G7NKS&= nbsp;    IO92ub

 

Biggleswade  UK

 

Details on QRZ.com

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb= _lf_group@blacksheep.org] On Behalf Of Alan Melia
Sent: 10 June 2018 22:18
To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: running a quick test beacon on 472.9. G7NKS. testin= g my revised Hafler PA set up.

 

Jim sadly the answer is not really a ''lo= w noise antenna''  (try a dummy load if you are determined :-)) )

 

I am afrain the first thing to do is find= the source of the noise and try to kill it.  The first thing to do is= check your own premises by sitch the supply master switch off. Listen on battery powered rig and note the reduction. At the levels you ar= e quoting I am sure some of this is self generated. I got my mean noise lev= ells downto a couple of microvolts from a 10m vertical alongside the house = with 130m of top-load.

 

A waterfall plot is quite useful for diag= nosing possible sources.

 

Do this before you expend any time money = and effort on something that may work well for someone else. (NB mini-whips= were developed for a specific appartment problem where ferro-concrete was the build material......they dont necessarily work with= our brick walls.)

 

A loop can be very useful for DFing the s= ources, but did not work for reception for Roelof.

 

I started quieting my station around the = late 1990s. Ok it has got worse in some areas but better in others. Small S= MPSUs often operate way higher than 136kHz now, but many previously quiet ''white goods'' was SMPoer controllers for efficiency eg = fridges and freezers, not to mention the IoT. Many SMPSUs create more RFI w= hen ''off' that when powering something. By ''off'' I mean in standby......= TVs can be bad for this<= /p>

 

I moonlight on the RSGB EMC committee so = have some experience and useful contacts.=

 

Best Wishes

Alan

G3NYK

 

 

----- Original Message -----

Sent: Saturday, = June 09, 2018 5:46 PM

Subject: LF: run= ning a quick test beacon on 472.9. G7NKS. testing my revised Hafler PA set = up. Can see it on B'ham grabber. thanx fer any other reports=

 

Hi All

 

running a quick test beacon on 472.9.   G7= NKS.  testing my revised Hafler PA set up.  Can see it on B'ham g= rabber.  thanx fer any other reports.  Message repeats every 5 mi= ns @ 5wpm. 

 

Will leave it running for couple of hours or so

 

approx 0.5W erp from a 10m vertical with 3 x 30m top= wires (running NW away from vertical )

 

ELAD FDM duo  0dBM output into cheap EBAY 1w br= oadband amp into Hafler 9505 as per W1TAG designs etc.

 

Will give WSPR a run later but having the devils own= job with getting WSJT-X to be stable, keep getting the =93hamlib dll =93 e= rror after a couple of cycles.  Very frustrating .

 

Also getting the ELAD to talk to HRDv5 and DM780 was= a nightmare, but eventually solved with virtual audio cables etc but certa= inly not intuitive or easy.

 

Strangely, the Hafler P4000 puts out a bit more powe= r as =93stock=94 than the 9505 so am thinking about removing the feedback c= ap as discussed in the various W1TAG pages but can=92t seem to work out how= to open the case of the 9505!

 

Jay/John =96 any tips?  Is it the allen bolts? =

 

Next thing is to lower S7-S8 noise on separate Rx an= tenna.  Have tried using Tx antenna which is 15m away from house but t= op wires go over house and so are prob picking up noise.  Current sepa= rate Rx antenna 10m vertical and 3 x 30m top wires also pass over house.

 

Any suggestions as to a good low noise Rx antenna mo= st welcome.  I=92ve tried a miniwhip but even when remote mounted on w= ooden pole with earthed braid at house entry it is still s8 noise.  G3= XIZ suggests a loop, he=92s probably right, but any other =93quick and dirty =93 ideas appreciated

 

The ELAD via the 0dBm is excellent as an exciter and= will generate RF down to 5khz, so after some judicious coil winding, I=92l= l be trying LF again and then the heady lows of VLF.  My best previous= Dx on 8.9khz being 500m!  (thats metres not km!)

 

I may try Roger=92s G3XBM earth loop set up, but las= t time it didn=92t work well but as I=92m out =93in the boonies=94 ~I don= =92t think I have much in the way of =93buried Utilities assistance=94=

 

Cheers for any reports

 

Mal (KEV) you must be able to hear me with your mons= ter set up in Scarbs!!

 

 

 

with best regards

 

 

Jim

 

Dr. Jim Cowburn G7NKS     IO92ub=

 

Biggleswade  UK

 

Details on QRZ.com

 

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