Date   
Upcoming Event: Open House and - Thu, 27.02.2020 20:00-21:00 #cal-reminder

Public@SouthBristolARC.groups.io Calendar <Public@...>
 

Reminder: Open House and

When: Thursday, 27 February 2020, 20:00 to 21:00, (GMT+00:00) UTC

View Event

Organizer: enquiries@...

Description: We welcome anyone with an interest in radio at all of our meetings but these evenings are set aside specifically to take time to chat to anyone new to the Club and introduce them to the hobby and members. The shack will be open and available for use by members and licensed visitors.

Upcoming Event: Propagation - Thu, 20.02.2020 20:00-21:00 #cal-reminder

Public@SouthBristolARC.groups.io Calendar <Public@...>
 

Reminder: Propagation

When: Thursday, 20 February 2020, 20:00 to 21:00, (GMT+00:00) UTC

Where:South Bristol ARC, Novers Park Community Association, Rear of 124 Novers Park Road, Bristol BS4 1RN

View Event

Organizer: Professor Cathryn Mitchell enquiries@...

Description:

Cathryn Mitchell is Professor of Electronic & Electrical Engineering and Academic Director of the University of Bath's Doctoral College.  In 2019 she was awarded the Edward Appleton Medal and Prize for her pioneering research in tomography and data assimilation revealing a completely new perspective on the Earth's ionosphere in response to extreme space weather.
In what promises to be a very interesting talk she will bring her knowledge to bear on the thorny issue of RF propagation.

#cal-reminder - Guest Speaker 20/02/2020 #cal-reminder

 

Ladies and gentlemen,

I was somewhat late to Club last Thursday and missed a number of you through a combination of my arrival time and being downstairs doing training for the current Foundation Course.

Please let me make the announcement that I would have made at the Club had the timings been a little more convenient.

We have a guest speaker at the Club this week, Professor Cathryn Mitchell from the University of Bath will be joining us to talk about Space Weather and its impacts on propagation and ionospheric performance.

Please come to this talk and bring anyone else who might be interested.

The FoundationCourse will not be taking place this week, to allow the students to join this very interesting talk that will help them with the Propagation part of the syllabus that we will get to later.

I look forward to meeting everyone again this Thursday.

73

Andy
--
Andy Jenner G7KNA BEng CEng MICE
Hon. Sec.
for and on behalf of South Bristol Amateur Radio Club
Novers Park Community Centre
Rear of 122 - 124 Novers Park Road
Bristol BS4 1RN
http://www.sbarc.co.uk
Follow us on Twitter http://twitter.com/G4WAW


Re: Connecting Bristols Around the World

 

A little research has revealed that the net is still active.  The start time is 21:30 EST (Eastern Standard Time) and the room is now all digital for those who understand those things.
--

73

Hon Sec

for and on behalf of South Bristol ARC

https://www.sbarc.co.uk

Connecting Bristols Around the World

 

Ladies and gentlemen,

Whilst paddling around the internet, I came across the following from Adam N4NT.  I don't know if anyone else has come across this net or even if it is still in action but if anyone has checked in to represent the only real Bristol worth mentioning the Club would be interested in hearing about it in passing.  I'm conscious that the timing is not exactly helpful for us but I know there are one or two night owls in the Club

Message reads:
Hello, I am the president of the Bristol Amateur Radio Club in Bristol, Tennessee & Bristol, Virginia, USA. I have recently created a wires-x room 61243 (analog) and connected it to our local club repeater. My goal is to contact amateurs in all the other Bristol's around the world, hoping that someone from each Bristol can connect to our room and check in at least one time on our weekly net. Our net is held on Tuesday nights at 9 .p.m. our time which is eastern time zone. I believe this would be Wednesday night at 2 a.m. where you are.
If you have someone who is willing to stay up and check in with us some time we would greatly appreciate it. The goal is to get at least one person one time but you are always welcome anytime and as many that would like to check in will be welcomed.

Thank you
Adam Dye N4NT .
73

Andy
--
Andy Jenner G7KNA BEng CEng MICE
Hon. Sec.
for and on behalf of South Bristol Amateur Radio Club
Novers Park Community Centre
Rear of 122 - 124 Novers Park Road
Bristol BS4 1RN
http://www.sbarc.co.uk
Follow us on Twitter http://twitter.com/G4WAW


South Bristol ARC (Region 11) - #Calendar of Events #calendar

 

Ladies and gentlemen,

I am pleased to attach our calendar of events for the forthcoming month and quarter.  These events are open to all who wish to attend.

For those who have not received these files before there should be 3 files attached:

1. Evening_Post_A4_xxxxxxxx.pdf - This provides details of the events over the coming month including a brief description of the event.

2. Event_Calendar_A4_xxxxxxxx.pdf - This is the title and organiser of our planned events over the next 3 months

3. sbarc_xxx_xxx_xxxx.csv - This is a comma separated variable file giving full details of our events over the next 3 months including descriptions.

The first two files will require a PDF Reader or Viewer.  Free and Open Source programs or applications are available for all operating systems including: Windows, OSX, Linux, BSD, iOS, Android and others.

The third file is text comma separated variable file which can be read by almost any text editor or word processor but is best suited to spreadsheets and databases.

If for any reason these files are not attached to this e-mail you may download them from the following links:


Additionally we have a .iCal file for use with calendar applications which you may download from the following link:


We look forward to welcoming you to our meetings which are open to anyone who wishes to attend.

73

Andy
--
Andy Jenner G7KNA BEng CEng MICE
Hon. Sec.
for and on behalf of South Bristol Amateur Radio Club
Novers Park Community Centre
Rear of 122 - 124 Novers Park Road
Bristol BS4 1RN
http://www.sbarc.co.uk
Follow us on Twitter http://twitter.com/G4WAW


Group Guidelines #guidelines

Public@SouthBristolARC.groups.io Group Moderators <Public@...>
 

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Vote for your Regional Rep

Andy G7KNA
 

The current Regional Rep for the South West is Dean Brice G0UIL.

To remain in post this year he needs your support. If you would like to support Dean to remain as Regional Rep and you are an RSGB member please click on the link below and log in yo the members area of the RSGB website to register your vote.


Please support Dean

Thanks

Andy G7KNA

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

On Wed, Jan 1, 2020 at 06:34 PM, Owen wrote:

Was wondering, the last batch of images earlier in the month I decoded contained a lot of white background and the amount of detail was less. Could that be part of the reason why I managed such good decodes that time compared to this?

Possibly, I didn't have the opportunity to receive any of the early December passes so I don't have a comparison. I certainly managed a better decode than you did this time though so perhaps the lower detail and less colour is more immune to interference which is what the green hash looks like.

Your FT60 has a single 3.5mm 4 connector speaker/mic jack with what I understand is the following wiring:

  1. Tip - Speaker
  2. Cloning (only used when programming the rig)
  3. Mic
  4. Sleeve - Ground

See https://pinoutguide.com/PortableDevices/yaesu_vertex_microphone_pinout.shtml.

4 pin connectors are available from CPC: https://cpc.farnell.com/multicomp/mc001292/phone-audio-connector-plug-4pos/dp/CN21844.

A length of screened audio cable wired tip - tip and sleeve - sleeve terminating in a "normal" 3 pole 3.5mm jack plug will allow you to hardwire your rig to your PC which might help with reducing interference.

3 pole 3.5mm plugs are also available from CPC, see: https://cpc.farnell.com/pro-signal/psg08320/3-5mm-jack-plug-3p-red/dp/AV19156.

If you are connected this way you might have to fiddle with both the volume level on your rig and the mic input levels on the PC before you get relaible decodes.

There are a couple of useful links that you might like to read:

  1. Essex Ham SSTV with a Baofeng
  2. Alan Gale G4TMV Interfacing Radios to Computers

--

73

Andy G7KNA

www.g7kna.co.uk

https://twitter.com/g7kna

www.linkedin.com/in/andywjenner

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

Yes, I submitted for the award and received mine.

I'll be posting it to TWITTER and my LinkedIn profile probably this weekend

73

Andy G7KNA
--
Andy Jenner
Q: What goes; "Pieces of seven, pieces of seven"?
A: A parroty error

Re: ARISS SSTV Transmissions #iss #sstv

Owen
 

Did you submit your pics for the award Andy? Just received mine by email 

Re: ARISS SSTV Transmissions #iss #sstv

Owen
 

Was wondering, the last batch of images earlier in the month I decoded contained a lot of white background and the amount of detail was less. Could that be part of the reason why I managed such good decodes that time compared to this?

Re: ARISS SSTV Transmissions #iss #sstv

Owen
 

https://www.dropbox.com/transfer/AAAAAGMGcQ2GKMDjv38RnDR0Dc-PyVfm6VKvcWsijIZiUGh0x_qicuk

Two more images from the other day, these I recorded the audio and decoded later on the PC. Bit disappointing really.

These were captured using the baofeng gt3tp with quarter wave whip. Seems the yaesu performs better with just the helical than the baofeng with quarter wave. I guess conditions may have varied. I think I'll get a quarter wave for the yaesu for next time. Also some kind of interface, homebrew maybe, to decode on the PC in real time.

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

Got a final couple of images on the 09:18 pass even though it was only 16 degrees above the horizon at maximum elevation.

Last link to download for those who are interested:

https://we.tl/t-3uboqk7n1a


--

73

Andy G7KNA

www.g7kna.co.uk

https://twitter.com/g7kna

www.linkedin.com/in/andywjenner

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

More images from the 07:41 UTC pass, managed 2 almost complete images this time but lower position of ISS meant slightly more interference and a lower quality. Will try on the final pass at 09:18 UTC but this is only 16 degrees so not expecting anything special.

Couple of photos and a short video to accompany the transmitted SSTV images this time.

Following link is valid for 7 days.

https://we.tl/t-CaUj3QmH0B

--

73

Andy G7KNA

www.g7kna.co.uk

https://twitter.com/g7kna

www.linkedin.com/in/andywjenner

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

In QSSTV the "Autoslant" option seems to be good at correcting the annoying parallelogram effect I had on yesterdays 08:30 pass!

This morning I was up for the 06:05 pass over my QTH and was rewarded with the SSTV image that you can download from the following link for the next 7 days.

This was received and decoded "live" in the boot of the car on the drive using:

  • Yaesu FT-817
  • Dual Band 2m/70cm on a roof rack mount on the car. On 2m this is an end fed vertical quarter wave
  • Signalink USB Interface
  • QSSTV running under LUbuntu 18.04 LTS
  • PC: Toshiba Satellite C660D-19X CPU: 1.3GHz AMD E-300 APU with Radeon(tm) HD Graphics

This link to download my captured image is:

https://we.tl/t-1OAe5oHQbR

2 more passes at 07:41 and 09:18 UTC...


--

73

Andy G7KNA

www.g7kna.co.uk

https://twitter.com/g7kna

www.linkedin.com/in/andywjenner

Re: ARISS SSTV Transmissions #iss #sstv

Owen
 

Not had so much luck this time around but did manage get two average quality images.


Going to have another crack at 6am tomorrow morning if I manage to get up!!

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

I had a chance to get setup for reception of the 08:30 pass on 31/12/2019 and captured one image, little bit of interference but still one of the best I've received to date, anyone interested can view this at the following link for the next 7 days.

https://we.tl/t-Rkm8QSwnYY

Waiting for the 10:05 pass for another go, this is the last one today (31/12/2019) at this QTH

Regards

--


73

Andy G7KNA

www.g7kna.co.uk

https://twitter.com/g7kna

www.linkedin.com/in/andywjenner

Re: ARISS SSTV Transmissions #iss #sstv

 

Further details of the planned end of year ARISS SSTV operation have been published, if you follow @ARISS_status on TWITTER you may have seen their announcement on Christmas Eve.

ARISS SSTV Transmissions

ARISS will be supporting SSTV transmissions worldwide in memory of cosmonauts Alexei Leonov, Valery Bykovsky and Sigmund Jaehn.

The transmissions are scheduled from December 28, 2019, starting at 11:00 UTC, until January 1, 2020 at 18:20 UTC when the system is scheduled for shutdown.

Transmissions will be on the standard frequency of 145.800 MHz and in the PD 120 format.

The Polish ARISS Team prepared an award for participants to this SSTV experiment. Please see https://ariss.pzk.org.pl/sstv/

The AMSAT Pass Predictor shows that we don't get any viable passes until 29 December, however there should be 23 passes over the Clubhouse in the operating window.

Date (UTC) AOS Time (UTC) Duration (hr:min:sec) AOS Azimuth (Degrees) Maximum Elevation (Degees) Max El Azimuth (Degrees) LOS Azimuth (Degrees) LOS (UTC)
29 Dec 2019 03:39:20 00:08:58 194 12 134 82 03:48:18
29 Dec 2019 05:14:37 00:10:41 236 45 142 76 05:25:18
29 Dec 2019 06:51:12 00:10:51 265 86 337 86 07:02:03
29 Dec 2019 08:27:58 00:10:48 281 71 193 110 08:38:46
29 Dec 2019 10:04:46 00:10:02 283 22 225 147 10:14:48
29 Dec 2019 11:42:50 00:05:21 262 3 236 202 11:48:11
30 Dec 2019 02:51:58 00:07:50 180 7 140 87 02:59:48
30 Dec 2019 04:26:37 00:10:29 227 32 134 76 04:37:06
30 Dec 2019 06:02:59 00:10:52 259 87 196 82 06:13:51
30 Dec 2019 07:39:46 00:10:51 279 84 203 103 07:50:37
30 Dec 2019 09:16:31 00:10:25 284 29 231 136 09:26:56
30 Dec 2019 10:53:56 00:07:25 271 6 230 184 11:01:21
31 Dec 2019 02:04:58 00:05:52 164 4 123 96 02:10:50
31 Dec 2019 03:38:42 00:10:09 216 24 159 77 03:48:51
31 Dec 2019 05:14:47 00:10:50 252 75 165 79 05:25:37
31 Dec 2019 06:51:32 00:10:52 275 87 336 96 07:02:24
31 Dec 2019 08:28:17 00:10:39 284 41 191 126 08:38:56
31 Dec 2019 10:05:22 00:08:41 277 11 217 169 10:14:03
01 Jan 2020 02:50:53 00:09:39 205 17 146 79 03:00:32
01 Jan 2020 04:26:37 00:10:47 244 59 152 77 04:37:24
01 Jan 2020 06:03:18 00:10:52 270 84 347 91 06:14:10
01 Jan 2020 07:40:04 00:10:46 283 56 191 117 07:50:50
01 Jan 2020 09:16:57 00:09:31 281 16 221 157 09:26:28

--

73

Hon Sec

for and on behalf of South Bristol ARC

https://www.sbarc.co.uk

Re: ARISS SSTV Transmissions #iss #sstv

Andy G7KNA
 

Owen,

Thanks for the link Andy, have been watching quite a few of the other episodes. I think I need to invest in a portable dual band yagi, the arrow antenna one they are using is available from a few places I've seen. I think I will try to work the low orbit satellites next. Is it worth even trying with a 1/4 wave antenna, or would that be totally futile? 

I think you'd find it disappointing. You would probably hear something assuming someone is calling but getting back might be challenging

The QO-100 is a major project from what I've seen, I am keen to upgrade to the next level of licence, I'm hopefully changing job in the new year, which should mean I am able to attend the club much more often, I rarely ever seem to get Thursday nights off at the moment. I guess trying to receive the QO-100 would be the first stage, then transmitting later.

Sound like a plan! You've probably come across these articles in your research already but:

The other thing I'm quite interested in doing is receiving weather satellite images from the NOAA/Meteor satellites (around 137 MHz I think?), I think an RTL-SDR or other SDR would be best of this? But will possibly need a LNA/filter from what I've read. Antennas, I've read a QFH Quadrifilar Helical Antennas are good, but very costly, but a crossed dipole (turnstile) might also work?? I've seen crossed dipoles for 137 MHz.

Plenty of people do this quite successfully:

Would it be very complicated to build an interface for the handheld so I can feed it directly into the PC? The SignaLink USB has leads/a jumper module for the FT60-R available, I guess I could get a set of leads for the handheld and also for the IC718 so I can use it for HF data modes too.

You don't have to go to the expense of a Signalink, particularly for receive only, at the simplest level all you need is a cable that can be taken out of a dedicated data port if your radio has one or failing that a headphone or external speaker port and into the mic input on your PC. If you want to get a little more sophisticated then you could put a 600Ω 1:1 isolating transformer in the line to prevent earth loops and use a cheap USB sound card dongle on the PC to keep system sounds and media playback separate from RF related signals but neither are essential if you're only doing receive. I have a few PTT interface circuits knocking around somewhere that might be of interest, but you really don't need anything complex or expensive for receive only.

I've made some chokes in the coax for my HF antenna, they are air chokes, people are saying ferrite chokes work much better? I think I might have to change my antenna for a balanced dipole, I've been looking at a T2FD antenna, which people say is a low noise antenna, but the terminating resistor saps the TX power. I guess a lot of it is experimentation to find what works best at a particular QTH.

A balanced antenna is always going to be better I suspect, I think Steve and the guys used a T2FD antenna on Lundy a few years ago and might have also taken it to Clytha, you'd need to ask them what it was like