Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v678AEGu029388 for ; Fri, 7 Jul 2017 10:10:15 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dTOHA-000206-3h for rs_out_1@blacksheep.org; Fri, 07 Jul 2017 09:06:08 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dTOGp-0001zp-Su for rsgb_lf_group@blacksheep.org; Fri, 07 Jul 2017 09:05:47 +0100 Received: from omr-m014e.mx.aol.com ([204.29.186.13]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dTOGk-00007f-1h for rsgb_lf_group@blacksheep.org; Fri, 07 Jul 2017 09:05:44 +0100 Received: from mtaomg-aac02.mx.aol.com (mtaomg-aac02.mx.aol.com [172.27.2.36]) by omr-m014e.mx.aol.com (Outbound Mail Relay) with ESMTP id 02D5638000A3 for ; Fri, 7 Jul 2017 04:05:39 -0400 (EDT) Received: from core-acb01b.mail.aol.com (core-acb01.mail.aol.com [172.27.24.1]) by mtaomg-aac02.mx.aol.com (OMAG/Core Interface) with ESMTP id A75EF38000081 for ; Fri, 7 Jul 2017 04:05:38 -0400 (EDT) Received: from 188.192.44.165 by webprd-a27.mail.aol.com (10.72.57.49) with HTTP (WebMailUI); Fri, 07 Jul 2017 04:05:38 -0400 Date: Fri, 7 Jul 2017 04:05:38 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15d1c1535f5-4bc5-1c05d@webprd-a27.mail.aol.com> In-Reply-To: References: MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.44.165] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1499414738; bh=Wa9bAk24TE3+MYXlOaUIEseojbRyTZcIUYYVOtBkefo=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=NbHicBnLicrXMs/P3zY1N0ztxyxunNnOjauU6tOTZnIdxgG2ZzyL7bL2m19EGQ+ag 9+j2uhMhwBOFGrlc1/VecyYEShborlcfYU1ooMGbfosZvH4hovbtLF52WPxTHEEEGJ t5ljWAmvlYdg5n0m0Z6efTFsLqi9EA43D9GKHeXg= x-aol-sid: 3039ac1b0224595f40d22a3a X-Scan-Signature: 13abe497adcf17a4e25c5e2a2ff79111 Subject: Re: LF: Simple coherent frequency generator Content-Type: multipart/alternative; boundary="----=_Part_137083_404159472.1499414738418" 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 2.75 Status: RO X-Status: X-Keywords: X-UID: 12190 ------=_Part_137083_404159472.1499414738418 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Thank you very much Ric for this most interesting hint. Unfortunately I couldn't find the two jpg images, they might have been in a= n attachment that didn't make it through the reflector. Would it be possibl= e to upload them to a website and share the links? One note regarding excitation at double frequency: Make sure that the XOR m= odulation is applied after the final divider, because otherwise the phase d= ifference would be halved (+-90 instead of +-180 degrees) and also ambiguou= s. Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Riccardo Zoli An: LF Group Verschickt: Fr, 7. Jul 2017 9:50 Betreff: LF: Simple coherent frequency generator Hi Markus, Domenico, Stefan, LF many thanks for last EbNaut decodes, dr Markus. And thanks Domenico for your outstanding EbNaut automatic decoder! In these days we have got good results using stand-alone NEO-M8N (or NEO-7M as well) modules like reference frequency generator: (no more external TCXO, OCXO, PLL, etc....hi); obviously, the module with his patch antenna should be installed in a good position. The output signal isn't affected by a significant jitter (up to 1 MHz) and remains very stable in phase. -A VERY SIMPLE COHERENT FREQUENCY GENERATOR (SCH1.JPG)- We need only a buffer on TP5 (pin3 of the U-blox hybrid, connected normally to the status LED) to adapt levels and impedance toward amplifier. SCH1.JPG is a simple solution tested by Tony IK1HGI, with GPS and buffer installed outside the house. The square wave signal is applied to PA using about 10 meters of RG174. The solution with RS-232(TTL 3.3V)->WiFi converter is a practical option (it works fine in my shack): you could use a normal COM (TTL 3.3V) to USB adapter. Use "U-center" (by U-blox - https://www.u-blox.com/en/product/u-center-windows) to pre-configure the module. After connecting it, it's necessary to set the navigation mode and minimum elevation of sats (thanks to Domenico for the advice). Go to... - Menu - View - Configuration view - Select item "NAV5 (Navigation 5)" (left side) - Set Dynamic Model to "Stationary" (right side) - Set Min SV Elevation to 10 degrees - Press Send button - Select item "TP5 (Timepulse 5)" (left side). - Select Frequency and Duty Cycle mode (right side) - Set Duty cycle values (50% normally) - Set QRG values Frequency and Frequency Locked; normal or x2 with G0MRF PA (http://www.g0mrf.com/630m.htm) or x4 with a generic SDR quadrature generator like 74HC74 (normally used with H-mode mixers) - Press Send button ...obviously we need GPS module status ALWAYS in locked mode to obtain a valid coherent signal... - Select item "CFG (Configuration)" (left side) - Select "Save current configuration" (right side) - Select all Devices (in particular I2C-EEPROM) by keeping pressing Shift k= ey - Press Send button Now the module is programmed. -BPSK MODULATOR (SCH2.JPG)- Now we need a BPSK modulator to send EbNaut messages: the simplest method uses XOR (or XNOR) logic ports. This is a very cheap, but fine solution to be EbNaut QRV in TX. In particular, this modulator can be used succesfully on G0MRF class D PA (http://www.g0mrf.com/630m.htm) and tested by Tony IK1HGI, but also in any other amplifier. In this last case, it needs a proper signal buffer. All the best 73 de Riccardo IW4DXW ------=_Part_137083_404159472.1499414738418 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Thank you very much Ric for this most interesting hint.<= br>
Unfortunately I couldn't find the two jpg images, they might have be= en in an attachment that didn't make it through the reflector. Would i= t be possible to upload them to a website and share the links?

One n= ote regarding excitation at double frequency: Make sure that the XOR m= odulation is applied after the final divider, because otherwise the phase d= ifference would be halved (+-90 instead of +-180 degrees) and also amb= iguous.

Best 73,
Markus (DF6NM)

-----Urspr=C3=BCngliche Mi= tteilung-----
Von: Riccardo Zoli <riccardozoli80@gmail.com>
An= : LF Group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 7. Jul 2= 017 9:50
Betreff: LF: Simple coherent frequency generator

H= i Markus, Domenico, Stefan, LF

many thanks for last EbNaut decodes, = dr Markus. And thanks Domenico
for your outstanding EbNaut automatic dec= oder!
In these days we have got good results using stand-alone NEO-M8N (= or
NEO-7M as well) modules like reference frequency generator: (no more<= br>external TCXO, OCXO, PLL,
etc....hi); obviously, the module with his = patch antenna should be
installed in a good position. The output signal = isn't affected by a
significant jitter (up to 1 MHz) and remains very st= able in phase.


-A VERY SIMPLE COHERENT FREQUENCY GENERATOR (SCH1= .JPG)-

We need only a buffer on TP5 (pin3 of the U-blox hybrid, conn= ected
normally to the status LED) to adapt levels and impedance towardamplifier.
SCH1.JPG is a simple solution tested by Tony IK1HGI, with G= PS and
buffer installed outside the house. The square wave signal is app= lied
to PA using about 10 meters of RG174.
The solution with RS-232(T= TL 3.3V)->WiFi converter is a practical
option (it works fine in my s= hack): you could use a normal COM (TTL
3.3V) to USB adapter.
Use "U-c= enter" (by U-blox -
https://www.u-blox.com/en/product/u-center-win= dows) to pre-configure
the module.
After connecting it, it's nece= ssary to set the navigation mode and
minimum elevation of sats (thanks t= o Domenico for the advice).

Go to...
- Menu - View
- Configura= tion view

- Select item "NAV5 (Navigation 5)" (left side)
- Set D= ynamic Model to "Stationary" (right side)
- Set Min SV Elevation to 10 d= egrees
- Press Send button

- Select item "TP5 (Timepulse 5)" (lef= t side).
- Select Frequency and Duty Cycle mode (right side)
- Set Du= ty cycle values (50% normally)
- Set QRG values Frequency and Frequency = Locked; normal or x2 with
G0MRF PA (http://www.g0mrf.com/630m.htm) or x4 with a gen= eric SDR
quadrature generator like
74HC74 (normally used with H-mode = mixers)
- Press Send button

...obviously we need GPS module statu= s ALWAYS in locked mode to obtain
a valid coherent signal...

- Se= lect item "CFG (Configuration)" (left side)
- Select "Save current confi= guration" (right side)
- Select all Devices (in particular I2C-EEPROM) b= y keeping pressing Shift key
- Press Send button

Now the module i= s programmed.


-BPSK MODULATOR (SCH2.JPG)-

Now we need a B= PSK modulator to send EbNaut messages: the simplest
method uses XOR (or = XNOR) logic ports.
This is a very cheap, but fine solution to be EbNaut = QRV in TX.
In particular, this modulator can be used succesfully on G0MR= F class D
PA (http://www.g0mrf.com/630m.htm) and tested by Tony IK1HGI, but alsoin any other amplifier.
In this last case, it needs a proper signal buf= fer.


All the best


73 de Riccardo IW4DXW

------=_Part_137083_404159472.1499414738418--