[Uram-rejections] To really blow your mind, smoke dynamite!

Sat Apr 6 13:19:33 BST 2019

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

 Please omit derogatory comparisons of other posters with CB operators.

The post that you submitted to uk.radio.amateur.moderated has been rejected by a
moderator. 

Your message appears to the moderator to be abusive or hurtful to
another contributor.

The group charter and moderation policy can be found at
  http://www.chiark.greenend.org.uk/uram/
Disputed moderation decisions can be discussed in the newsgroup
  uk.net.news.moderation

============================================ Full text of your message follows
> From webstump at chiark.greenend.org.uk Sat Apr 06 10:21:03 2019
> Return-path: <webstump at chiark.greenend.org.uk>
> Envelope-to: webstump+?@slimy.greenend.org.uk
> Received-SPF: softfail (haggis.mythic-beasts.com: transitioning domain of eternal-september.org does not designate 2a01:4f8:191:31c5::2 as permitted sender) client-ip=2a01:4f8:191:31c5::2; envelope-from=news at eternal-september.org; helo=reader02.eternal-september.org;
> To: uk-radio-amateur-moderated at usenet.org.uk
> From: Gareth's was W7 now W10 Downstairs Computer <headstone255 at yahoo.com>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: To really blow your mind, smoke dynamite!
> Date: Sat, 6 Apr 2019 10:20:28 +0100
> Organization: A noiseless patient Spider
> Message-ID: <q89r1n$ble$1 at dont-email.me>
> References: <q88g75$8uh$1 at dont-email.me> <q89ho5$ufi$1 at dont-email.me>
> Mime-Version: 1.0
> Content-Type: text/plain; charset=utf-8; format=flowed
> Content-Transfer-Encoding: 8bit
> User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1
> Cancel-Lock: sha1:ra1z0j8bNQ8kzo3udCulqC+Wj+A=
> X-Auth-Sender: U2FsdGVkX18GA/q2uMAbLxp8PKohKz47F7sLy1SxcpA=
> Content-Language: en-GB
> X-Mythic-Source-External: YES
> X-BlackCat-Spam-Score: 143
> X-Spam-Status: No, score=14.3
> Delivered-To: usenet-uk-radio-amateur-moderated at usenet.org.uk
> X-BlackCat-To: usenet-uk-radio-amateur-moderated at usenet.org.uk
> X-STUMP-Warning-0: Unfolded headers Received: Received: Received: Received: Received: User-Agent:
> 
> On 06/04/2019 07:42, David Taylor wrote:
> > On 05/04/2019 22:09, Gareth's was W7 now W10 Downstairs Computer wrote:
> >> As amateur TV now uses digital broadcasting techniques, I bethought
> >> me, as part of my self training, to read up on the subject. My
> >> previous TV knowledge being based on a 5-week lecture course on
> >> the PAL system (Book by G.N.Pratchett?)
> >>
> >> But it's not a subject for study late into the evening, for,
> >> as in the title, you can blow your mind with the complexities involved,
> >> in particular the amount of computation involved in motion compensation,
> >> whereby to reduce the amount of transmitted data, successive frames are
> >> assumed to be identical except for things that have moved.
> >>
> >> Come back hand keyed 12 WPM CW for the sake of simplicity!  :-)
> > 
> > Yes, we've come a long way, and I expect WEFAX appeared equally as 
> > complex (and difficult to receive) when it first appeared seventy years 
> > ago.  Framestores, smelly FAX machines - remember those?
> > 
> > The techniques you mention have been used in digital video - including 
> > that on your phone or other camera - for many years now so finding the 
> > information should not be difficult.  Just as you have been able to use 
> > your phone without a detailed understanding of the techniques, you can 
> > send and receive DATV (Digital Amateur TeleVision) with simple hardware 
> > and software, just as you can use digital voice without understanding 
> > all the detailed technicalities there.  Of particular RF interest to the 
> > amateur maybe the UK's digital TV using COFDM - multiple narrow-band 
> > carriers, although most DATV in Europe is the DVB-S/S2 standard rather 
> > than DVB-T.
> > 
> > I guess you are a member of the BATC?  Join if you aren't but interested 
> > in DATV as they have many articles.  No longer do you need complex, 
> > expensive equipment, but a PC running the DATV Express software, an SDR 
> > such as the LimeSDR or PlutoSDR for transmit, and an SDR (with pre-amp) 
> > and the SDRangel software for receive.  All free software.
> > 
> > 
> > https://www.datv-express.com/uploads/UserGuide/DATV-Express%20Users%20Guide%20for%20Windows-draft14.pdf 
> > 
> > 
> >    https://github.com/f4exb/sdrangel/releases
> > 
> > Just with SDRangel and a £10 RTL-SDR dongle you can learn a lot about 
> > signals and their spectra, and even hear digital voice too (or radio 4!).
> > 
> 
> Sorry, but I must take you to task, for the essential difference between 
> CB Radio, the operator's hobby, and amateur radio, the
> technical enthusiast's pursuit, is that we in amateur radio revel in
> understanding how things work and we don't just use things, which
> is why I am studying further, "self training in wireless communication"
> and so on.
> 
> Actually, my phone, at 13 years old, doesn't do digital video. I was
> working in the development department and designing the production
> test facility and when the phone was launched, Nokia gave one to
> every member of the team (including me as a contractor) but that's
> not really philanthropic as it sounds, for should there be owt
> wrong with the firmware on first release, then it's the design
> tema who would be on the ball to get it sorted tout-de-suite.
> 
> Back in 1972, I was a member of BATC and have some CQ-TV editions
> from that time, including one with my photo in but wrongly
> identified as my mentor, Martin Allard (RIP) G3WFC, G6AEM/T
> whom I had first bumped into late in 1968 when we both went
> for an interview at Bangor Uni on the same day. (We both
> ended up at Essex, G3UOE)
> 
> 
> 
> 
> 
> 
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBAgAGBQJcqJlVAAoJEJ0q8Kb5p+Me15cIAJMMZw7kp7+Ie5zXMOhf8eOh
ecv4t9ehUdpbcWqaUwme9ftryx+dWxq2zP6nwBshKYjTcJFlC9BDxB7pVIUVZEpW
iLNB2Ht6zMbAqPu+NWKRmyaqMwUjDof9RcrpbgCcAMdA9Ynp9uTTu99f9g2zYODd
lzNFnyUhOxKN9mJO1i0Z/wzUTiDiJeQJpM2gIBC0Ww0Ogurp8ybBKqqvMcwI5nEg
/ridqyGtkxCd7OF5Cy/j/F7WySM+cvwsGUxactx41bBBzKhYxRMzv9tGXhJAapPy
pXqFTbpDFIwFYAa+2p1Ipgke+OmDG242bgpwdXBSeMzPEJjOAqWaPdqPEtP6sPQ=
=czFT
-----END PGP SIGNATURE-----