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The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Peter, Henny, >> I wonder if it is possible to receive DHO on 23.4 KHz when you'r transmitting on 8270 Hz ? Yes, this is not difficult, see pics at df6nm.bplaced.net/VLF/MSK_sync_during_transmit/ [...] Content analysis details: (-2.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -2.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 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: 79aab7440207271f32757adc503f8c76 Subject: Re: LF: Re: 8270 Content-Type: multipart/alternative; boundary="----=_NextPart_000_009D_01CE440B.9831E9A0" 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, MISSING_OUTLOOK_NAME 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 x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mtain-mp05.r1000.mx.aol.com ; domain : mx.aol.com DKIM : pass x-aol-sid: 3039ac1dc149517cf9a44576 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_009D_01CE440B.9831E9A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Peter, Henny, >> I wonder if it is possible to receive DHO on 23.4 KHz when you'r = transmitting on 8270 Hz ? Yes, this is not difficult, see pics at = df6nm.bplaced.net/VLF/MSK_sync_during_transmit/ I used a small resonant ferrite loopstick tuned to 23.4 kHz, with the = secondary winding connected directly to the soundcard without a preamp. = This worked well even when the little antenna was less than 1 m from the = big loading coil. You may have to optimize the antenna orientation, and = set the mixer gain low enough that your TX signal doesn't saturate the = ADC. With 8.27 kHz one small difficulty is that the third harmonic will be = aliased to near the DHO frequency (48 - 3 * 8.27 =3D 23.19 kHz). This = was easily fixed by setting up a 23400 Hz Chebyshev bandpass in blackbox = one. One possible pitfall is that after the daily DHO outage, SpecLab seems = to aquire samplerate sync immediately, but sometimes you are left with a = large number (several 1000s) in the "error integral" tab. This will = delay the application of the SR measurement and may leave the frequency = uncorrected for several hours. You can fix this quickly by switching the = SR correction off and on again (tick measure only - apply - untick = measure only - apply). Best 73, Markus ------=_NextPart_000_009D_01CE440B.9831E9A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Peter, Henny,
 
>> I wonder if it is possible = to receive=20 DHO on 23.4 KHz when you'r transmitting on 8270 Hz ?
 
Yes, this is not difficult, see pics at = df6nm.bplaced.net/VLF/MSK_sync_during_transmit/
 
I used a small resonant ferrite = loopstick tuned to=20 23.4 kHz, with the secondary winding connected directly to the = soundcard=20 without a preamp. This worked well even when the little antenna was less = than 1=20 m from the big loading coil. You may have to optimize the antenna=20 orientation, and set the mixer gain low enough that your TX signal = doesn't=20 saturate the ADC.
 
With 8.27 kHz one small = difficulty is=20 that the third harmonic will be aliased to near the DHO = frequency=20 (48 - 3 * 8.27 =3D 23.19 kHz). This was easily fixed by setting = up a=20 23400 Hz Chebyshev bandpass in blackbox one.
 
One possible pitfall is that after the = daily DHO=20 outage, SpecLab seems to aquire samplerate sync immediately, but=20 sometimes you are left with a large number (several 1000s) in = the=20 "error integral" tab. This will delay the application of = the SR=20 measurement and may leave the frequency uncorrected for several = hours. You=20 can fix this quickly by switching the SR correction off and on again = (tick=20 measure only - apply - untick measure only - apply).
 
Best 73,
Markus
 
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