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x-ms-office365-filtering-correlation-id: 14d45234-3a9f-4c05-0de5-08d3f849bad9 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(1601124038)(1603103081)(1601125047);SRVR:VE1EUR03HT097; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(432015012)(82015046);SRVR:VE1EUR03HT097;BCL:0;PCL:0;RULEID:;SRVR:VE1EUR03HT097; x-forefront-prvs: 0100732B76 spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Oct 2016 17:59:55.3560 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1EUR03HT097 X-OriginalArrivalTime: 19 Oct 2016 18:00:00.0172 (UTC) FILETIME=[9C08CEC0:01D22A32] X-Scan-Signature: 6b0411a0208d534ec13cf5eb48c0cfb7 Subject: LF: WSPRing on 137 with new Hafler amp set up Content-Type: multipart/alternative; boundary="_000_DB6PR1001MB132008B7DFCE8D55BCE85BD7ECD20DB6PR1001MB1320_" 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 X-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Content-Length: 8726 Status: O X-Status: X-Keywords: X-UID: 9121 --_000_DB6PR1001MB132008B7DFCE8D55BCE85BD7ECD20DB6PR1001MB1320_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi All, I'm giving my new hafler audio amp set up a try out on 137 WSPR. IC706mk2G as an exciter (puts out about 100uW on 137), feeding into 1.5W br= oadband amp off ebay as per Dave Pick's article in Radcom. New chokes fitt= ed 600nH. This then feeds into the unbalanced input of the the Hafler P40= 00. The output is a 4:1 step up txfrmr wound as per the plans on the W1VD webp= age. 2 lots of 16uF caps feeding into two 7 turn coils of coax wound on 7= 7 material ferrite toroids (I didn't have the cores to hand). The coax cores then connect to a balun assembly made using 77 material core= s and this goes to the antenna. The whole assembly steps up the impedance from the speaker terminals from 1= 2ohm to 50ohm. The impedance was measured as 195ohm vs a 50ohm dummy load = (4:1) and is broadband from 50khz up to 1mhz. DC resistance is 2 ohm. The amp is rated at 500W for audio and de-rated by 3dB @ 137khz. I'm currently WSPRing on 137.5. Any spots most welcome IO92ub Biggleswade With best regards Jim Dr. Jim Cowburn G7NKS --_000_DB6PR1001MB132008B7DFCE8D55BCE85BD7ECD20DB6PR1001MB1320_ Content-Type: text/html; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable

Hi All,

 

I'm giving my new hafler audio amp set up a try out on 1= 37 WSPR.

 

IC706mk2G as an exciter (puts out about 100uW on 137), f= eeding into 1.5W broadband amp off ebay as per Dave Pick's article in Radco= m.  New chokes fitted 600nH.   This then feeds into the unbalanced input of the the Hafler P4000.

 

The output is a 4:1 step up txfrmr wound as per the &nbs= p;plans on the W1VD webpage.   2 lots of 16uF caps feeding into t= wo 7 turn coils of coax wound on 77 material ferrite toroids (I didn't have the cores to hand).

 

The coax cores then connect to a balun assembly made usi= ng 77 material cores and this goes to the antenna.  =

 

The whole assembly steps up the impedance from the speak= er terminals from 12ohm to 50ohm.  The impedance was measured as 195oh= m vs a 50ohm dummy load (4:1)  and is broadband from 50khz up to 1mhz. DC resistance is 2 ohm.

 

The amp is rated at 500W for audio and de-rated by 3dB @= 137khz.   

 

I'm currently WSPRing on 137.5.=

 

Any spots most welcome   IO92ub  &nb= sp; Biggleswade

 

With best regards

 

 

Jim

 

 

Dr. Jim Cowburn  G7NKS

 

 

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