Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v9OEsCUo019193 for ; Tue, 24 Oct 2017 16:54:13 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1e70VY-0007bn-5e for rs_out_1@blacksheep.org; Tue, 24 Oct 2017 15:48:44 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1e70VX-0007be-O6 for rsgb_lf_group@blacksheep.org; Tue, 24 Oct 2017 15:48:43 +0100 Received: from mail-wm0-x22c.google.com ([2a00:1450:400c:c09::22c]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1e70VU-0007Mz-9F for rsgb_lf_group@blacksheep.org; Tue, 24 Oct 2017 15:48:42 +0100 Received: by mail-wm0-x22c.google.com with SMTP id r196so3942862wmf.2 for ; Tue, 24 Oct 2017 07:48:39 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=f+XUMOo4Y+V8GvvCRz6qaMH7uF0bOt+R3G3FJ2/oBqs=; b=T8AZMhOkZGhChdf6R661Y2ao0YN9rhchqf2yA3zX89UrwBibdYiqOPO6L4DrmWcU0B rfDdcJHGUKF026Wuhc3UnfOCYZ5hh8MadBkw6/vwXQBOdYjYlKS6qd07iOoFVPErLz3a /95RDIY1Eyct3YifZlqjLUT1MORIt0enIDk2voJnuMEapJ0qoqCQBxEd9nefuNh0NCnj A8k7gvQ3/RLS9ppVPuR39KMkjp9QID4rHsNxbAnS2qav7ikg32OjPpstszfKUKCa3G/R Jv4zHHeV2peFJAJ7cFp/Uv00c3BPh7GZiXk/a86W8pdGWMtWAEoUzsonsS9TUpCnQLdo XgtA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=f+XUMOo4Y+V8GvvCRz6qaMH7uF0bOt+R3G3FJ2/oBqs=; b=Mj71jcnY8yr4qRWkLBTELTw2Yaj1/dvrzF00tS20gbkLFrv9/kRc/X/OYZ/kwwyVME k0F9ZDCLNSJ2kwHtc48vz3S158EcOMyIAt270HxXmmdzw+F0vK4QsEHE95c3IvU659gS di7OyD8AZectcp3+ZP8Yr8hbPJjYnuc4AFv4W4Xkd2YDs2Exbuc5obChHYyfX7S9vIOt T5TRB9V7X9OArskqY1hrESw7jp5ngyXxCnCk1Xoa1VTuByn/QYdKExnE4uuP6nB0XXh0 oWXa2yW8wf8doGsvwBtiERyqAd1yOLtBbkRFO7K76vjeiQuipcgw8D3TSMt9CpzJKv+o yHYw== X-Gm-Message-State: AMCzsaWX8yXb6hXE2w+JMjhtMCaE4Tet/ZYU1IySy9hpxm+IR/4zhoED a4QQCF4q/Y3nq8/xWuHQkxzljC5kLJiA0KQo7Yc= X-Google-Smtp-Source: ABhQp+TMekgSWhlCJOvkkM6FGz07U+D04YTZpdupxUumgVjGHwg9sBcNiQg0qbJwBdFeLg4EdkYfA5tcJvJ0l+MsAiQ= X-Received: by 10.80.173.77 with SMTP id z13mr17638031edc.133.1508856518178; Tue, 24 Oct 2017 07:48:38 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.177.3 with HTTP; Tue, 24 Oct 2017 07:48:37 -0700 (PDT) In-Reply-To: <5ABEF02DE15242638A23850ED5FED8CA@ASUS> References: <5ABEF02DE15242638A23850ED5FED8CA@ASUS> From: Andy Talbot Date: Tue, 24 Oct 2017 15:48:37 +0100 Message-ID: To: rsgb_lf_group@blacksheep.org X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: I bought it before Ebay was even a glimmer in someone's eye. Made by Eltek, there doesn't seem to be a tyoe number. Its an old 48cm rack-mounted sized ex telephone exchange job. I dived inside and added a voltage adjust facility on the front panel so it could be varied between 24 - 60V, put some high current screw terminals in place of the blade connector and added a DVM module in place of the analogue panel V-meter [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) 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: 640db27bf4e79f20c339a3df4106c3a6 Subject: Re: LF: Re: MF/160 Content-Type: multipart/alternative; boundary="f403045c2c7ec87a5a055c4c081f" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, LINES_OF_YELLING,LINES_OF_YELLING_2 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 --f403045c2c7ec87a5a055c4c081f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I bought it before Ebay was even a glimmer in someone's eye. Made by Eltek, there doesn't seem to be a tyoe number. Its an old 48cm rack-mounted sized ex telephone exchange job. I dived inside and added a voltage adjust facility on the front panel so it could be varied between 24 - 60V, put some high current screw terminals in place of the blade connector and added a DVM module in place of the analogue panel V-meter Andy 'jnt On 24 October 2017 at 13:59, wrote: > Hi Andy > > I, like you use SMPSU=E2=80=99s 50V approx 10A . Mine are Chinese albeit = shipped > in the UK! was a bit dirty but all it needed was a mains input filter. No= w > very quiet. Wonder what type/model/EBay number you are using. I went for = a > pair of 28V 10A units so I could use 56 or 28 V on the 472 KHz TX. > > Thanks > 73 Ian G4GIR > > > Whic > > *From:* Andy Talbot > *Sent:* Monday, October 23, 2017 8:20 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: Re: Re: LF: MF/160 > > I don't knoe why radio amateurs are so anti SMPSU on principle. > Unfiltered nasty Chinese ones may be bad, but anything can be cleaned up. > > My 50 Volt 20A one I use with teh 475kHz PA is absolutely quiet, not a > whisper detectable on any frequency from LF to HF > > 'jnt > > > On 23 October 2017 at 20:07, dhchurch wrote: > >> Hello Andy >> >> The idea of using any SMPS in, or near, the shack is somewhat abhorrent. >> It is possible to introduce a series circuit in a linear PSU which is no= t >> exactly a regulator but has a hum cancellation circuit, something that u= sed >> to appear in an ancient National Semiconductor publication. I'd love to = try >> it but just haven't left any room in my PSUs, they're stuffed full, >> including a cooling fan. A couple of 100Hz side bands are at least >> predictable, my PA has, but there is one regular transmission on LF whi= ch >> has all manner of spurii making reception here somewhat variable. >> >> I think Dave, GW8GLO, has a system which promptly knocks off his >> transmitter SMPS when going into Rx mode, maybe this is the way to go. >> >> 73, Hugh, M0DSZ >> >> >> ----- Receiving the following content ----- >> *From:* Andy Talbot >> *Receiver:* rsgb_lf_group >> *Time:* 2017-10-23, 10:12:17 >> *Subject:* Re: Re: LF: MF/160 >> >> Its a difficult call - I have a similar problem with my 700 Watt 137kHz >> Tx. 30dB hum sidebands corresponds to 3% ripple, which in the main schem= e >> of things is not that much. It would need an enormous reservoir capacito= r >> to make a serious reduction. >> >> Either that or design the Tx to run from 50V and use a SMPSU instead of >> raw rectified AC >> >> Andy G4JNT >> >> On 23 October 2017 at 10:03, dhchurch wrote: >> >>> Mal, I think a little attention should be paid to, perhaps, your power >>> supply. The 100Hz sidebands, as I recall from earlier this week, should= be >>> much lower in level. Seen on Spectrum Lab at one stage, they were less = than >>> -30dB in comparative level. >>> 73, Hugh, M0DSZ >>> >>> ----- Receiving the following content ----- >>> *From:* Andy Talbot >>> *Receiver:* rsgb_lf_group >>> *Time:* 2017-10-22, 22:44:59 >>> *Subject:* Re: LF: MF/160 >>> >>> You're so strong, Mal, I'm getting decodes on your hum sidebands >>> >>> 21:36 G3KEV 0.475804 -27 0 IO94sh 5 G4JNT IO90iv 384 189 2017-10-22 >>> 21:36 G3KEV 0.475704 +3 0 IO94sh 5 G4JNT IO90iv 384 189 2017-10-22 21:3= 6 >>> G3KEV 0.475604 -29 0 IO94sh 5 G4JNT IO90iv 384 189 2017-10-22 1 >>> >>> Andy G4JNT >>> >>> On 22 October 2017 at 19:25, mal hamilton wrote= : >>> >>>> NICE CONDX 160M THIS EVENING VK7DIK REPORTING G3KEV WSPR MODE >>>> >>>> LOOKING GOOD FOR MF/630 M ALSO >>>> >>>> TNX REPORT DE MAL/G3KEV >>>> >>>> Sent from Mail for >>>> Windows 10 >>>> >>>> >>> >>> >> >> > --f403045c2c7ec87a5a055c4c081f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I bought it before Ebay was even a glimmer in someone'= s eye.=C2=A0 Made by Eltek,=C2=A0 there doesn't seem to be a tyoe numbe= r.=C2=A0 Its an old 48cm rack-mounted sized ex telephone exchange job.=C2= =A0

I dived inside and added a voltage adjust facility o= n the front panel so it could be varied between 24 - 60V, put some high cur= rent screw terminals in place of the blade connector and added a DVM module= in place of the analogue panel V-meter

Andy 'jnt


On 24 October 2017 at 13:59, <i.frith@ntlw= orld.com> wrote:
Hi Andy
=C2=A0
I, like you use SMPSU=E2=80=99s 50V approx 10A . Mine are Chinese albe= it shipped in=20 the UK! was a bit dirty but all it needed was a mains input filter. Now ver= y=20 quiet. Wonder what type/model/EBay number you are using. I went for a pair = of=20 28V 10A units so I could use 56 or 28 V on the 472 KHz TX.
=C2=A0
Thanks
73 Ian G4GIR
=C2=A0
=C2=A0
Whic
=C2=A0
Sent: Monday, October 23, 2017 8:20 PM
Subject: Re: Re: Re: LF: MF/160
=C2=A0
I don't knoe why radio amateurs are so anti SMPSU on= =20 principle.=C2=A0=C2=A0=C2=A0=20
Unfiltered nasty Chinese ones may be bad, but anything can be cleaned= =20 up.=C2=A0
=C2=A0
My 50 Volt 20A one I use with teh 475kHz PA is absolutely quiet, not a= =20 whisper detectable on any frequency from LF to HF=20
=C2=A0
'jnt
=C2=A0
=C2=A0
On 23 October 2017 at 20:07, dhchurch <dhchurch@lineone.net> wrote:
Hello Andy
=C2=A0
The idea of using any SMPS in, or near, the shack is somewhat abhorr= ent.=20 It is possible to introduce a series circuit in a linear PSU which is not= =20 exactly a regulator but has a hum cancellation circuit, something that us= ed to=20 appear in an ancient National Semiconductor publication. I'd love to = try it=20 but just haven't left any room in my PSUs, they're stuffed full, = including a=20 cooling fan. A couple of 100Hz side bands are at least predictable, my PA= =20 has,=C2=A0 but there is one regular transmission on LF which has all mann= er of=20 spurii making reception here somewhat variable.
=C2=A0
I think Dave, GW8GLO, has a system which promptly knocks off his=20 transmitter SMPS when going into Rx mode, maybe this is the way to go.
=C2=A0
73, Hugh, M0DSZ
=C2=A0
-----=20 Receiving the following content -----
From:=20 Andy Talbot
Receiver:=20 rsgb_lf_group
Time:=20 2017-10-23, 10:12:17
Subject:=20 Re: Re: LF: MF/160
=C2=A0
Its a difficult call - I have a similar problem with m= y 700=20 Watt 137kHz Tx.=E3=80=80 =E3=80=8030dB hum sidebands corresponds to 3% = ripple, which in the=20 main scheme of things is not that much.=E3=80=80 =E3=80=80It would need= an enormous=20 reservoir capacitor to make a serious reduction.=E3=80=80=E3=80=80=20
=C2=A0
Either that or design the Tx to run from 50V and use a SMPSU inste= ad of=20 raw rectified AC
=C2=A0
Andy=E3=80=80 G4JNT
=C2=A0
On 23 October 2017 at 10:03, dhchurch <dhchurch@lineone.net> wrote:
Mal, I think a little attention should be paid to, perhaps, your= =20 power supply.=E3=80=80The 100Hz sidebands, as I recall from earlier t= his week,=20 should be much lower in level. Seen on Spectrum Lab=E3=80=80at one st= age, they=20 were less than -30dB in comparative level.=E3=80=80
=E3=80=80
73, Hugh, M0DSZ
=E3=80=80
-----=20 Receiving the following content -----
From:=20 Andy Talbot
Receiver:=20 rsgb_lf_group
Time:=20 2017-10-22, 22:44:59
Subject:=20 Re: LF: MF/160
=C2=A0
You're so strong, Mal,=E3=80=80 I'm gettin= g decodes on your hum=20 sidebands=20
=C2=A0
21:36=E3=80=80=E3=80=80G3KEV=E3=80=80=E3=80=800.475804=E3=80= =80=E3=80=80-27=E3=80=80=E3=80=800=E3=80=80=E3=80=80IO94sh=E3=80=80=E3=80= =805=E3=80=80=E3=80=80G4JNT=E3=80=80=E3=80=80IO90iv=E3=80=80=E3=80=80384=E3= =80=80=E3=80=80189=E3=80=80=E3=80=802017-10-22=20 21:36=E3=80=80=E3=80=80G3KEV=E3=80=80=E3=80=800.475704=E3=80=80=E3= =80=80+3=E3=80=80=E3=80=800=E3=80=80=E3=80=80IO94sh=E3=80=80=E3=80=805=E3= =80=80=E3=80=80G4JNT=E3=80=80=E3=80=80IO90iv=E3=80=80=E3=80=80384=E3=80=80= =E3=80=80189=E3=80=80=E3=80=802017-10-22=20 21:36=E3=80=80=E3=80=80G3KEV=E3=80=80=E3=80=800.475604=E3=80=80=E3= =80=80-29=E3=80=80=E3=80=800=E3=80=80=E3=80=80IO94sh=E3=80=80=E3=80=805=E3= =80=80=E3=80=80G4JNT=E3=80=80=E3=80=80IO90iv=E3=80=80=E3=80=80384=E3=80=80= =E3=80=80189=E3=80=80=E3=80=802017-10-22=20 1
=C2=A0
Andy=E3=80=80 =E3=80=80G4JNT
=C2=A0
On 22 October 2017 at 19:25, mal hamilto= n <g3kevmal@talktalk.net>=20 wrote:

NICE CONDX 160M THIS EVENING VK7DIK =E3=80= =80REPORTING=20 G3KEV WSPR MODE

LOOKING GOOD FOR MF/630 M ALSO

TNX REPORT DE MAL/G3KEV

=E3=80=80

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=E3=80=80

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=E3=80=80

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Sent from Mail for Windows 10

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--f403045c2c7ec87a5a055c4c081f--