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References: [ +from:marcom@centrum.cz: 14 ]

Total 14 documents matching your query.

1. Re: Topband: K7TJR Antenna (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Wed, 05 Dec 2007 12:33:05 +0100
Does anybody have a better readable schematics of the K7TJR phasing unit and controller? I tried nearly all possible tricks with the hand drawn scanned images (being quite well trained in DTP and ima
/archives//html/Topband/2007-12/msg00054.html (7,135 bytes)

2. Re: Topband: QRP Question (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Mon, 12 Dec 2011 20:59:14 +0100
For sure, among worst violations of good operating practice is the (now very common and massive) use of /QRP, ie. OK1RR/QRP. There is no other reason than to attract more attention than others (using
/archives//html/Topband/2011-12/msg00275.html (10,146 bytes)

3. Re: Topband: MFJ Noise Canceller 1026/1025 (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Fri, 06 Jan 2012 00:19:54 +0100
Try this one: http://www.pa0sim.nl/Phaser%2080%20-%2010%20meters.htm Of course, the design is NOT limited to 80m. Excellent results produced the BN73-202 binoculars for T1-T4 (2 turns where the schem
/archives//html/Topband/2012-01/msg00079.html (8,063 bytes)

4. Re: Topband: LOTW Participation (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Fri, 17 Feb 2012 04:41:01 +0100
I love the LoTW. QSL bureau is in some countries misused to press hams into forced membership of their national ham radio organization. AFAIK it is here in OK and also in DL... LoTW is then the only
/archives//html/Topband/2012-02/msg00247.html (7,176 bytes)

5. Topband: VE3DO Loop (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Wed, 13 Feb 2013 09:09:03 +0100
A detailed analysis of the VE3DO Loop is on my web site: http://www.ok1rr.com/index.php/antennas/8-the-ve3do-receiving-loop A NEC file for further investigation is available via email upon request. 7
/archives//html/Topband/2013-02/msg00105.html (9,848 bytes)

6. Re: Topband: Rig Question (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Fri, 20 Jun 2014 00:31:32 +0200
Dne 19.6.2014 21:00, Mike Waters napsal(a): Is anyone here controlling their Elecraft K3, etc. with their PC? 73, Mike www.w0btu.com Yes, I do. Everything in Linux supporting Hamlib/rigctld via UDP p
/archives//html/Topband/2014-06/msg00165.html (9,293 bytes)

7. Re: Topband: Binocular Cores (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Mon, 08 Jun 2015 09:22:45 +0200
Is somewhere available a list of ferrite mixes indicating the frequency where R=X? 73, Martin, OK1RR Dne 1.6.2015 v 17:31 Tom W8JI napsal(a): You really need to do a single loop through the core wind
/archives//html/Topband/2015-06/msg00043.html (7,860 bytes)

8. Topband: W7IUV preamp (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Fri, 28 Aug 2015 23:53:10 +0200
The latest version 6 http://www.okdxf.eu/files/preamp_r60.pdf 73, Martin, OK1RR _________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2015-08/msg00094.html (8,532 bytes)

9. Re: Topband: KD9SV-OK1RR relays ??? (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Sat, 29 Aug 2015 20:31:02 +0200
Hi Douglas, I am sorry to tell you that none of the relays you have is good for the front end saver. They are usual small signal relays but a reed relay should be used. The most important thing is no
/archives//html/Topband/2015-08/msg00105.html (8,830 bytes)

10. Re: Topband: rx preamps (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Sat, 29 Aug 2015 23:54:23 +0200
Yes, it is the latest version AFAIK. BTW the PCB is in process, it should be double sided, ready for production at Seeed Studio or other professional PCB maker. It is not needed for a single unit, WD
/archives//html/Topband/2015-08/msg00111.html (8,043 bytes)

11. Re: Topband: KD9SV-OK1RR relays ??? (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Sun, 30 Aug 2015 18:57:06 +0200
It is here: http://www.somis.org/ 73, Martin, OK1RR Dne 30.8.2015 v 16:32 Larry napsal(a): Measures (K6???) did a relay speed-up scheme for QSK on an SB220, I don't remember the details but it was so
/archives//html/Topband/2015-08/msg00122.html (13,224 bytes)

12. Re: Topband: KD9SV-OK1RR relays ??? (RX Front End Protector) (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Mon, 31 Aug 2015 00:00:21 +0200
Array Solutions offers a 'RX Front End Protector' based on back-to-back 1N4148 diodes. Schematic: http://www.ok1rr.com/public/rxfep.png more details: http://www.arraysolutions.com/Products/as_rxfep.h
/archives//html/Topband/2015-08/msg00128.html (11,146 bytes)

13. Re: Topband: Handheld Impedance Analyzer (score: 1)
Author: Martin Kratoska <marcom@centrum.cz>
Date: Mon, 28 Mar 2016 00:54:57 +0200
Try SARK-110 http://www.sark110.com/home beats others mostly hands down. 73, Martin, OK1RR Dne 27.3.2016 v 21:08 dick.bingham napsal(a): Greetings All I am getting fed up with multiple trips between
/archives//html/Topband/2016-03/msg00234.html (8,470 bytes)

14. Re: Topband: DXE NCC-1 phasing box (score: 1)
Author: <marcom@centrum.cz>
Date: Fri, 23 Sep 2016 18:09:39 +0200
Oh, a time ago I considered to buy the NCC-1. My final "NO" decision was caused by the "no schematic" policy or "Proprietary information" balast (also know as a Trade Secret). I will never buy such p
/archives//html/Topband/2016-09/msg00094.html (7,275 bytes)

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