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1. LF: RE: JA7NI - SV8CS (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Sun, 5 Oct 2014 09:54:56 +0900

Spiros, Congratulations! Hideho YAMAMURA, JF1DMQ Hi to all. Last night I had a nice success on LF band. My signal received by JA7NI, Kuni grabber in LF at 136.171,50 KHz. Thank you Kuni and Yas (JA8S

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-10/msg00099.html (21,490 bytes)

2. LF: RE: JA7NI - SV8CS (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Sun, 5 Oct 2014 19:58:43 +0900

Spiros and all, Great, GL. However, FYI LF activities in JA is expected to be low for a few days, in general. I don't know if this applies to JA7NI's activity. A very strong Typhoon is hitting Japan,

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-10/msg00103.html (15,393 bytes)

3. LF: RE: Japan on 475 kHz. (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Sun, 21 Dec 2014 21:20:37 +0900

Dimitris and all LF/MF, Yes, in JA, 630m will be permitted at EIRP 1Wmax., effective Jan.05, 2015. Official Directive was published on Dec.17, 2014. however, there are following conditions (I think,

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00192.html (11,814 bytes)

4. RE: LF: RE: Japan on 475 kHz. (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Mon, 22 Dec 2014 00:26:36 +0900

Dear Jan, Thank you for your reply. Never heard of that move in JA. I guess, AM BCs' value is appreciated, after the earthquake and Tsunami disaster in 2011. NDBs are disappearing, but that's another

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00195.html (15,958 bytes)

5. RE: LF: RE: Japan on 475 kHz. (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Tue, 23 Dec 2014 09:08:50 +0900

Dimitris, Nice that you don't hear complaints. That's nice. My quick calculation resulted in -120dBc necessary, to reduce QRM to adjacent houses, (I may be wrong)., and I am thinking how to make it.

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00224.html (14,077 bytes)

6. RE: LF: RE: Japan on 475 kHz. (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Tue, 23 Dec 2014 09:23:41 +0900

Stefan, Thank you for the diagram, nice picture, and that you don't have complaints You have a BPF. It should help a lot, for low harmonics. And your TX is very compact. I was impressed. I hope so. 7

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00225.html (13,418 bytes)

7. RE: LF: RE: Japan on 475 kHz. (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Tue, 23 Dec 2014 12:25:21 +0900

Hello Dimitris-san, we have the same regulation (with grace period now), but, it seems that the ministry was afraid of the actual interference, hence, on site test. In my quick calculation, I assumed

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00228.html (13,611 bytes)

8. LF: Happy New Year 2015 (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Thu, 1 Jan 2015 01:08:50 +0900

LF, Happy New Year 2015. May this year be prosperous to everyone. 73's Hideho YAMAMURA, JF1DMQ

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00322.html (9,422 bytes)

9. LF: RE: Closure of German Longwave Broadcast (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Thu, 1 Jan 2015 01:21:37 +0900

Markus and all, I agree. I would add, AM is receivable with a germanium-radio receiver, a tuned circuit, a diode and a crystal earphone, an easy project for a young, a good introduction to electronic

/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00323.html (18,532 bytes)

10. RE: LF: Re: Ground (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Sun, 20 Sep 2015 23:50:04 +0900

Hello Marcin, My experience on 2200m seems to agree with Alan's suggestion. I buried 6 sections of 30cm wide copper mesh at about 20cm deep, 10 to 15m long, totaling about 70m. My first experiment wa

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-09/msg00084.html (18,582 bytes)

11. RE: VLF: NPM over the pole (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Thu, 6 Oct 2016 05:59:01 +0900

Peter, Nice to know that Ebino, Japan, 22.2 kHz, was received in EU. Found by a quick Google search, located in south Japan, Ebino-city, Miyazaki, Japan, with 500W output, four (pair) towers of heigh

/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00069.html (11,033 bytes)

12. RE: LF: HNY (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Sun, 1 Jan 2017 01:41:58 +0900

Dear All, May this year 2017 be happy and fruitful. Hideho YAMAMURA/JF1DMQ Jan.1, 2017, with LF Ant. down for a while

/rsgb_lf_group-archives/html/rsgb_lf_group/2016-12/msg00403.html (9,890 bytes)

13. RE: LF: Rogowski-coils for RF measurements (score: 1)

Author: "Hideho YAMAMURA" <pba01030@nifty.com>

Date: Tue, 23 Oct 2018 10:42:25 +0900

Stephan and all, You might be interested in the following, although not Rogowski type, a cut toroidal core, clamp-type, current transformer + rectifier. You need a high-impedance voltmeter. A normal

/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00156.html (17,831 bytes)

14. Re: LF: active antenna output termination? (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Wed, 10 Oct 2012 22:06:40 +0900

Hello Stefan, Did you try feeding with battery ? Also, an isolating-transformer between the power-feeder and RX ? I experienced 1-2dB drop of noise level with the battery, and small improvement with

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-10/msg00192.html (12,742 bytes)

15. LF: JA7NI is transmitting (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Sun, 28 Oct 2012 12:49:11 +0900

hello George DU1GM and all, now JA7NI is transmitting on 137.779 DFCW, since 02:26UTC, it's 03:50UTC now, and continuing. George, looks like your grabber is silent now. Appreciate if you can switch i

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-10/msg00410.html (11,611 bytes)

16. Re: LF: JA7NI is transmitting (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Sun, 28 Oct 2012 14:26:55 +0900

hello George, That was unfortunate, but great, I noticed you're back. re WSJTX, a lot of thanks go to Joe. WSJT-65 gave me EME QSO. Now, I am excited to experince WSJTX on LF, but long way to go for

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-10/msg00633.html (12,862 bytes)

17. Re: LF: JA7NI is transmitting (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Sun, 28 Oct 2012 13:22:00 +0900

hi Dimitris, unfortunately, he stopped his transmission at 03:51 UTC, just after I sent my mail, and I don't know how regularly he plans to transmit. pse check; http://www003.upp.so-net.ne.jp/JH1GVY/

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-10/msg00644.html (13,136 bytes)

18. Re: LF: Re: Grabber Page (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Sun, 07 Oct 2012 11:13:56 +0900

Hello George, Nice to learn about your Grabber. For us JAs, it will certainely be a very good indicator of tranmitting performance. Thank you !! My 136kHz TX antenna is temporary down for improvement

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-10/msg00662.html (10,393 bytes)

19. LF: again JA7NI is transmitting (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Sun, 28 Oct 2012 14:53:18 +0900

hello all, again, JA7NI is transmitting on 137.779 DFCW, since 05:31 UTC, (about 25 minutes ago). you can check his signal on JA Grabbers, http://www003.upp.so-net.ne.jp/JH1GVY/ja-grabbers.html Hideh

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-10/msg00689.html (12,616 bytes)

20. Re: LF: ALL de JA6EH (Japan): Beacon Op4 in NAGASAKI JAPAN 50w + Long wire (score: 1)

Author: Hideho YAMAMURA <pba01030@nifty.com>

Date: Tue, 13 Nov 2012 22:39:16 +0900

Graham, We have no liscense on 500kHz nor 477kHz in Japan. We expect 477kHz next year. I know JA6EH is active on 136kHz. Did I answer your question ? Hideho YAMAMURA, JF1DMQ Showing as 500 ? is this

/rsgb_lf_group-archives/html/rsgb_lf_group/2012-11/msg00038.html (10,095 bytes)