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Date: Sat, 13 Feb 2010 20:19:11 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1AF8@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: Audio reference signal by DCF77 clock?
Thread-Index: AcqrYKNcQRLVwG9XQueyRDmVcxTy7AADRSanAFrTpmc=
References: <fc7eccec1002090910s5fc7d42aybfce15ed093b032a@mail.gmail.com><BF4A524700075746A6467658DFC7102C1284D4B33E@ICTS-S-EXC2-CA.luna.kuleuven.be><op.u7y043pdyzqh0k@pc1> <04336A6FA0CA4A719B65FBD5A3C214D7@AGB><op.u7y5xabkyzqh0k@pc1><38A51B74B884D74083D7950AD0DD85E82A1AF5@File-Server-HST.hst.e-technik.tu-darmstadt.de> <1265923210.3722.5.camel@gerhard-desktop> <38A51B74B884D74083D7950AD0DD85E82A1AF7@File-Server-HST.hst.e-technik.tu-darmstadt.de>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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Subject: LF: Audio reference signal by DCF77 clock?
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Dear LF group,
=20
I have a question to an audio reference signal generator and, as always,=
 you will have some good suggestions...
=20
Since today i have also installed Spectrum Lab by DL4YHF. There, i found=
 the possibility to make a correction of the transceiver frequency drift=
 by applying a audio reference signal. This is very useful for me, since=
 my K2 has a temperature frequency drift of arround 20Hz (e.g. when openin=
g the window, snow outside).
=20
If i understood it correctly, i have to apply this signal to e.g. the left=
 audio channel (microphone input at the PC), if my RX signal is at the rig=
ht channel(?).=20
=20
One way to generate that reference signal could be to use my DDS-VFO at e.=
g. f=3D600,0Hz. But than i cannot use it any more to generate a test signa=
l in the 137kHz range.
=20
So i thought about building a reference signal generator, using DCF77 at=
 77,50000000000000000000000000000000000000000000000000000000000000000 kHz=
 ;-) There are several ways to realise that and also many ready to use cir=
cuits. But i want to build my own(!). I have an idea about the circuit but=
 perhaps it is a good idea to ask YOU if this will give a stable reference=
 signal:
=20
Input stage should be a standard ferrite rod antenna, brought to resonance=
 by a C, of course. Than a simple amplifier using a BF245C or so. Then, fu=
rther amplification until the voltage waveform gets (almost) rectangular.=
 Perhaps a schmitt trigger stage, such as CMOS4093 to get a proper rectang=
ular signal. Then, 4 D-Flipflops CMOS4013 to divide the signal by 128. The=
 resulting frequency should be 605,4687500000000000000000000000000000000=
 Hz. If this will be a solution, it would cost not even 10EUR...
=20
My question, or worries, are about the following: What about the noise ,=
 that is added to the voltage of DCF77? Will the frequency vary a few pHz=
 ( ;-) ) due to that noise? And what about the trigger level of the schmit=
t trigger: This cheep circuit may not have a constant trigger level and th=
us the periode will vary from pulse to pulse? What about QSB of the signal=
 of DCF77? This will vary the voltage (between constant time steps, when=
 du(DCF)/dt is changing within two steps) at the input of the schmitt trig=
ger and thus the output frequency will be f+ x*du/dt? In other words: It=
 is possible to use the frequency 77,5000... kHz itself, or do i have to=
 read out the message schema, that is provided, such as the cheep digital=
 clocks do it?
=20
There are several modules available, that provide a 1Hz output signal or=
 so. But what i want is a frequency in the NF range, that can be applied=
 to the soundcard or a direct conversion receiver. Since my interest is no=
rmally based on LF operation, not to normal frequeny generators, this shou=
ld not become a to big project, so easy but homemade circuits will be choo=
sen :-)
=20
What do you think?
=20
Stefan/DK7FC
=20

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