Date   

Re: New 30THz video

Barry Chambers
 

Yes, this should work but I have yet to think of an easy way to make one which doesn't have too much "aperture" blockage in the "on" position.




On 28/06/2021 12:17, militaryoperator via groups.io wrote:
Experimenting with 30THz requires a whole new way of thinking which is why it is fascinating. It still uses electromagnetic waves, so it's still "radio" but not as you know it!
73 Barry, G8AGN


Rather than rotate the hot plate why not have flaps in front, like a big Navy Signal light. You could then send CW a bit easier?.

-- 
73
Barry, G8AGN


Re: New 30THz video

militaryoperator
 

Experimenting with 30THz requires a whole new way of thinking which is why it is fascinating. It still uses electromagnetic waves, so it's still "radio" but not as you know it!
73 Barry, G8AGN


Rather than rotate the hot plate why not have flaps in front, like a big Navy Signal light. You could then send CW a bit easier?.

US_Navy.jpg


Re: My KST Experience today .......................

Andy G4JNT
 

When you're close together the bearings do approximate to 180 deg apart

In the early days of wideband 10GHz activity in the UK pre-dating PCs. and certainly laptops, handheld programmable calculators were used in the field.   Ops then often used Pythagorus on NGRs to calculate distance and bearing, since numerical NGRs were quickly generated from the alpha type and the calculation was simple - hence the predominance of NGR quoted locations in the SITES.DAT site database dating from that period.   Most 'normal' paths were even in the same large NGR  square, so Pythagorus could be applied to just the NGR numbers without having to work out the SU, SZ etc. parts. 

For the paths worked on wideband FM on 10GHz the accuracy was quite adequate and of course always gave reciprocal bearings 180° apart.  
It was only later, around the late '90s, when longer paths were worked via tropo etc that proper calculation came into widespread use and specifying 8 digit locators came into widespread use.

Before GPS / and the universal use of WGS84, the conversion between Lat/Long specified using the GBR36 spheroid and NGR was reasonably straightforward,  'only' needing a 6th order polynomial.    With the advent of WGS84 the spheroids had to be converted if Lat/Long conversion to and from NGR was needed, and a general solution gives around 3 metre accuracy over the whole of the UK. For better accuracy than that, lookup tables of correction factors need to be applied.  My latest software includes a couple of subroutines for conversion between the two spheroids using the generic conversion to 3m accuaracy.


On Mon, 28 Jun 2021 at 11:36, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
Thank you for the explanation. I suppose the +- 180 degrees only works for orienteering and from the same location. 
73
Dave G4GLT.


On 28 Jun 2021, at 10:57, Colin G4EML <colin@...> wrote:


Hi Robin, 

Yes, I have used it before. But I never worked out how to send a CQ. It sounds like you have just fixed that, I will give it another try. 

I really don’t have much enthusiasm for contests nowadays anyway. KST2ME not working was just another reason to give up and go home!. 

Colin. 






On 28 Jun 2021, at 08:00, Robin Szemeti - G1YFG <robin@...> wrote:

Colin,

Next time, try my software,  nothing to install, runs in any browser (even on a tablet or phone)  and no keys needed, just uses your existing callsign and password.:


It could have saved your day!



On Sun, 27 Jun 2021 at 16:58, Colin G4EML <colin@...> wrote:

I gave up and came home today because when I started up KST2ME it said my key had expired!  I wasn’t having a good day anyway so that just finished it for me.

 

Colin G4EML

 

 

 

From: Robin Szemeti - G1YFG
Sent: 27 June 2021 16:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] My KST Experience today .......................

 

I find the whole "expiring key" thing on KST2ME quite bizarre and unnecessary.  The software sends its version and name as it signs in, so if the author wished to track who was using it, then he could just ask for stats from the server if he wanted them. 

 

On Sun, 27 Jun 2021 at 16:23, Andy G4JNT <andy.g4jnt@...> wrote:

Did you generate a new password for KST perhaps?   

Could you have changed your KST password? 

Could there now be two versions of '4UVZ registered?

 

 

 

 

 

On Sun, 27 Jun 2021 at 16:20, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:

Thanks Andy

I have no idea what my ME password was ..for a couple of years ...all I have done to get in was to click on a desktop link and then connect ...until last month when the secret key ran out .. I rather assumed that the key was my way in didn't know it needed a password as well!

Yesterday as you know I set up the 2you varient and the new password for that seems to have broken the ME version 

A

 

Virus-free. www.avg.com


--
Robin Szemeti - G1YFG

 


--
Robin Szemeti - G1YFG


Re: New 30THz video

Andy G4JNT
 

Sitting outside a deli in Winchester early on Saturday morning, I was being pleasantly warmed by the IR radiators - like patio heaters I guess -  they have installed for the benefit of their outdoor-seated guests.
The heaters look like over-powered dull light bulbs and are probably in the 500 - 1000W region.   They would be keyable for QRSS with  a faster response than your heated plate




On Mon, 28 Jun 2021 at 11:40, Barry Chambers <b.chambers@...> wrote:

Ben

yes, we were working hilltop to hill top at 850nm.

Neil is correct about 30THz sources. Without deep pockets and appropriate safety precautions, the only other amateur source of 30THz radiation for DX is a source of heat, i.e. a heated metal plate or the Sun or even the Sun's radiation reflected or emitted off the Moon. I have made several heated plate emitters but there is a limit as to how hot and how big these can be made to give you a high EIRP at 30THz and also to be able to modulate the radiation, hence my interest now in using 30THz radiation from the Sun. For amateurs, there is also no advantage in trying to use a narrowband 30THz source since the readily available sensors are wideband - 1000s of GHz wide! So it makes sense to use a wideband IR source such as a heated object so as to fill the receive sensor bandwidth with signal power rather than just noise. Also, since the Melexis sensors exhibit best sensitivity with a slow response time - typically 1/2 sec, you cannot use normal speed CW. The other factor to consider is that every object emits IR radiation and this sets a limit to how well you can "see" a 30THz source when it is surrounded by other objects which themselves have been heated by the Sun, i.e. the QRM is a big problem!

Experimenting with 30THz requires a whole new way of thinking which is why it is fascinating. It still uses electromagnetic waves, so it's still "radio" but not as you know it!

73 Barry, G8AGN



On 28/06/2021 09:50, Neil Smith G4DBN wrote:
On 28/06/2021 09:07, militaryoperator via groups.io wrote:
Wow, thats amazing, 60 Mile with an led. Must have been a line of sight, mountain top to mountain top?


Hi Ben, the really nifty work with optical comms is cloudbounce and near line of sight using atmospheric dust as a scattering medium. Cloudbounce using an array of 60 or so lenses at the transmit end was used to get 288 km across the Tasman Strait by VK7MO and his chums.  https://www.amateurradio.com/tag/cloudbounce/

I have some foot-square Fresnel lenses and very high-power red LEDs, and there are quite a few ops with red-light gear. Red-sensitive Silicon Photomultipliers are available now which match the sort of focus spot size of a Fresnel lens.

For proper power on 30 THz, there are sub-£100 watercooled CO2 laser tubes of course, but you need a fairly fancy beam expander so you don't just cut a hole through the optics. Also, the kit is about as portable as an AR88.

There are stern limits on the use of optical lasers and high intensity LED beams as a result of idiots targeting aircraft pilots, with increasingly tight controls near to airports, and I guess even 10.64 micrometre radiation from those laser tubes would be subject to the same controls despite not being a risk to pilots.

The UKNanowaves IO group is the place to gather. Much like the sub9kHz and LF groups, you'll recognise some microwave op callsigns in there.

Neil G4DBN



-- 
73
Barry, G8AGN


Re: New 30THz video

Barry Chambers
 

Ben

yes, we were working hilltop to hill top at 850nm.

Neil is correct about 30THz sources. Without deep pockets and appropriate safety precautions, the only other amateur source of 30THz radiation for DX is a source of heat, i.e. a heated metal plate or the Sun or even the Sun's radiation reflected or emitted off the Moon. I have made several heated plate emitters but there is a limit as to how hot and how big these can be made to give you a high EIRP at 30THz and also to be able to modulate the radiation, hence my interest now in using 30THz radiation from the Sun. For amateurs, there is also no advantage in trying to use a narrowband 30THz source since the readily available sensors are wideband - 1000s of GHz wide! So it makes sense to use a wideband IR source such as a heated object so as to fill the receive sensor bandwidth with signal power rather than just noise. Also, since the Melexis sensors exhibit best sensitivity with a slow response time - typically 1/2 sec, you cannot use normal speed CW. The other factor to consider is that every object emits IR radiation and this sets a limit to how well you can "see" a 30THz source when it is surrounded by other objects which themselves have been heated by the Sun, i.e. the QRM is a big problem!

Experimenting with 30THz requires a whole new way of thinking which is why it is fascinating. It still uses electromagnetic waves, so it's still "radio" but not as you know it!

73 Barry, G8AGN



On 28/06/2021 09:50, Neil Smith G4DBN wrote:
On 28/06/2021 09:07, militaryoperator via groups.io wrote:
Wow, thats amazing, 60 Mile with an led. Must have been a line of sight, mountain top to mountain top?


Hi Ben, the really nifty work with optical comms is cloudbounce and near line of sight using atmospheric dust as a scattering medium. Cloudbounce using an array of 60 or so lenses at the transmit end was used to get 288 km across the Tasman Strait by VK7MO and his chums.  https://www.amateurradio.com/tag/cloudbounce/

I have some foot-square Fresnel lenses and very high-power red LEDs, and there are quite a few ops with red-light gear. Red-sensitive Silicon Photomultipliers are available now which match the sort of focus spot size of a Fresnel lens.

For proper power on 30 THz, there are sub-£100 watercooled CO2 laser tubes of course, but you need a fairly fancy beam expander so you don't just cut a hole through the optics. Also, the kit is about as portable as an AR88.

There are stern limits on the use of optical lasers and high intensity LED beams as a result of idiots targeting aircraft pilots, with increasingly tight controls near to airports, and I guess even 10.64 micrometre radiation from those laser tubes would be subject to the same controls despite not being a risk to pilots.

The UKNanowaves IO group is the place to gather. Much like the sub9kHz and LF groups, you'll recognise some microwave op callsigns in there.

Neil G4DBN



-- 
73
Barry, G8AGN


Re: My KST Experience today .......................

Dave
 

Thank you for the explanation. I suppose the +- 180 degrees only works for orienteering and from the same location. 
73
Dave G4GLT.


On 28 Jun 2021, at 10:57, Colin G4EML <colin@...> wrote:


Hi Robin, 

Yes, I have used it before. But I never worked out how to send a CQ. It sounds like you have just fixed that, I will give it another try. 

I really don’t have much enthusiasm for contests nowadays anyway. KST2ME not working was just another reason to give up and go home!. 

Colin. 






On 28 Jun 2021, at 08:00, Robin Szemeti - G1YFG <robin@...> wrote:

Colin,

Next time, try my software,  nothing to install, runs in any browser (even on a tablet or phone)  and no keys needed, just uses your existing callsign and password.:


It could have saved your day!



On Sun, 27 Jun 2021 at 16:58, Colin G4EML <colin@...> wrote:

I gave up and came home today because when I started up KST2ME it said my key had expired!  I wasn’t having a good day anyway so that just finished it for me.

 

Colin G4EML

 

 

 

From: Robin Szemeti - G1YFG
Sent: 27 June 2021 16:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] My KST Experience today .......................

 

I find the whole "expiring key" thing on KST2ME quite bizarre and unnecessary.  The software sends its version and name as it signs in, so if the author wished to track who was using it, then he could just ask for stats from the server if he wanted them. 

 

On Sun, 27 Jun 2021 at 16:23, Andy G4JNT <andy.g4jnt@...> wrote:

Did you generate a new password for KST perhaps?   

Could you have changed your KST password? 

Could there now be two versions of '4UVZ registered?

 

 

 

 

 

On Sun, 27 Jun 2021 at 16:20, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:

Thanks Andy

I have no idea what my ME password was ..for a couple of years ...all I have done to get in was to click on a desktop link and then connect ...until last month when the secret key ran out .. I rather assumed that the key was my way in didn't know it needed a password as well!

Yesterday as you know I set up the 2you varient and the new password for that seems to have broken the ME version 

A

 

Virus-free. www.avg.com


--
Robin Szemeti - G1YFG

 


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Colin G4EML
 

Hi Robin, 

Yes, I have used it before. But I never worked out how to send a CQ. It sounds like you have just fixed that, I will give it another try. 

I really don’t have much enthusiasm for contests nowadays anyway. KST2ME not working was just another reason to give up and go home!. 

Colin. 






On 28 Jun 2021, at 08:00, Robin Szemeti - G1YFG <robin@...> wrote:

Colin,

Next time, try my software,  nothing to install, runs in any browser (even on a tablet or phone)  and no keys needed, just uses your existing callsign and password.:


It could have saved your day!



On Sun, 27 Jun 2021 at 16:58, Colin G4EML <colin@...> wrote:

I gave up and came home today because when I started up KST2ME it said my key had expired!  I wasn’t having a good day anyway so that just finished it for me.

 

Colin G4EML

 

 

 

From: Robin Szemeti - G1YFG
Sent: 27 June 2021 16:51
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] My KST Experience today .......................

 

I find the whole "expiring key" thing on KST2ME quite bizarre and unnecessary.  The software sends its version and name as it signs in, so if the author wished to track who was using it, then he could just ask for stats from the server if he wanted them. 

 

On Sun, 27 Jun 2021 at 16:23, Andy G4JNT <andy.g4jnt@...> wrote:

Did you generate a new password for KST perhaps?   

Could you have changed your KST password? 

Could there now be two versions of '4UVZ registered?

 

 

 

 

 

On Sun, 27 Jun 2021 at 16:20, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:

Thanks Andy

I have no idea what my ME password was ..for a couple of years ...all I have done to get in was to click on a desktop link and then connect ...until last month when the secret key ran out .. I rather assumed that the key was my way in didn't know it needed a password as well!

Yesterday as you know I set up the 2you varient and the new password for that seems to have broken the ME version 

A

 

Virus-free. www.avg.com


--
Robin Szemeti - G1YFG

 


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Andy G4JNT
 

It assumes a sphere - but that's more than good enough for our applications.

GtCircleAngle= ACOS(SIN(BaseLat) * SIN(Lat) + COS(BaseLat) * COS(Lat) * COS(Longit - BaseLongit))
Bearing = ACOS(CSbear = (SIN(LatR) - SIN(BaseLatR) * CSarc) / (COS(BaseLatR) * SIN(GtCircleAngle))        

So if you swap LatR and BaseLatR  you don't get reciprocal bearings



On Mon, 28 Jun 2021 at 10:16, Robin Szemeti - G1YFG <robin@...> wrote:
 I'm pretty confident the lat/long to bearing formula works correctly though, as it calculates the solid angle between the points.



Re: My KST Experience today .......................

Robin Szemeti - G1YFG
 

Great Circle routes ... I recall from pilot training how as you fly the shortest distance between two points, the bearing of magnetic north does not remain constant ... the straight line drawn on a map (the rhumb line) is for small distances, the bearing and shortest distance between two points ... however for points very distant on a map, it is not.  The "great circle" line is the line a piece of string would take if stretched out on the globe, and does not maintain a constant heading to true north .. imagine a line that goes from say, florida, over northern Europe and onwards to china ... you start off on a northerly heading, fly close to the pole, and then end up on a southerly heading ...

Infact, if you set off and kept a constant heading ... eventually, you would spiral towards one of the poles ...


On Mon, 28 Jun 2021 at 10:15, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Good point, there are special cases where it is though. eg on the equator, but apart from that, because it is on a spherical surface, not a cartesian plane, it makes things interesting ... I'm pretty confident the lat/long to bearing formula works correctly though, as it calculates the solid angle between the points.


On Mon, 28 Jun 2021 at 10:11, Andy G4JNT <andy.g4jnt@...> wrote:
Bearings are never 180 degrees apart.   Here's teh classic to think about:
One station is on the north pole, the other is elsewhere
The N-Pole station is ALWAYS on a bearing of 0 deg from the other, but what is the reciprocal in that case ?



On Mon, 28 Jun 2021 at 09:59, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
Tried the kst2you link and it looks great. The only query is why the reciprocal bearings on such sites are never + or - 180degrees exactly as per the theory. The magnetic variation here is only 30 minutes so wouldn’t account for the differences , though of course other stations mag variation may be a lot larger I suppose. 
73 Dave G4GLT. 


On 28 Jun 2021, at 09:51, Robin Szemeti - G1YFG <robin@...> wrote:


Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Robin Szemeti - G1YFG
 

Good point, there are special cases where it is though. eg on the equator, but apart from that, because it is on a spherical surface, not a cartesian plane, it makes things interesting ... I'm pretty confident the lat/long to bearing formula works correctly though, as it calculates the solid angle between the points.


On Mon, 28 Jun 2021 at 10:11, Andy G4JNT <andy.g4jnt@...> wrote:
Bearings are never 180 degrees apart.   Here's teh classic to think about:
One station is on the north pole, the other is elsewhere
The N-Pole station is ALWAYS on a bearing of 0 deg from the other, but what is the reciprocal in that case ?



On Mon, 28 Jun 2021 at 09:59, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
Tried the kst2you link and it looks great. The only query is why the reciprocal bearings on such sites are never + or - 180degrees exactly as per the theory. The magnetic variation here is only 30 minutes so wouldn’t account for the differences , though of course other stations mag variation may be a lot larger I suppose. 
73 Dave G4GLT. 


On 28 Jun 2021, at 09:51, Robin Szemeti - G1YFG <robin@...> wrote:


Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Andy G4JNT
 

I (re)wrote a whole suite of stuff for locator / NGR / Site database lookup / distance 7 bearing
Height lookup, path plotting and terrain plots

The source code is in there and if you dig deep enough there are the great circle equations for bearings to and from




On Mon, 28 Jun 2021 at 10:10, Andy Talbot <andy.g4jnt@...> wrote:
Bearings are never 180 degrees apart.   Here's teh classic to think about:
One station is on the north pole, the other is elsewhere
The N-Pole station is ALWAYS on a bearing of 0 deg from the other, but what is the reciprocal in that case ?



On Mon, 28 Jun 2021 at 09:59, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
Tried the kst2you link and it looks great. The only query is why the reciprocal bearings on such sites are never + or - 180degrees exactly as per the theory. The magnetic variation here is only 30 minutes so wouldn’t account for the differences , though of course other stations mag variation may be a lot larger I suppose. 
73 Dave G4GLT. 


On 28 Jun 2021, at 09:51, Robin Szemeti - G1YFG <robin@...> wrote:


Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Robin Szemeti - G1YFG
 

One thing I do want to add is the  distance/bearing to the top of a chat window, ... and maybe as a "hover over" if you hold the cursor over their callsign in the chat window .. now I REALLY have to go and do some work!


On Mon, 28 Jun 2021 at 09:51, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Andy G4JNT
 

Bearings are never 180 degrees apart.   Here's teh classic to think about:
One station is on the north pole, the other is elsewhere
The N-Pole station is ALWAYS on a bearing of 0 deg from the other, but what is the reciprocal in that case ?



On Mon, 28 Jun 2021 at 09:59, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
Tried the kst2you link and it looks great. The only query is why the reciprocal bearings on such sites are never + or - 180degrees exactly as per the theory. The magnetic variation here is only 30 minutes so wouldn’t account for the differences , though of course other stations mag variation may be a lot larger I suppose. 
73 Dave G4GLT. 


On 28 Jun 2021, at 09:51, Robin Szemeti - G1YFG <robin@...> wrote:


Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

Robin Szemeti - G1YFG
 

A good question ...  I convert Maidenhead to lat/long ... and then do a lat/long  bearing calculation,  AFAIK it should produce (+- rounding error of 1) a 180 reciprocal.  I suppose I should feed it some test data ...

function bearing(startLat, startLng, destLat, destLng){
  startLat = toRadians(startLat);
  startLng = toRadians(startLng);
  destLat = toRadians(destLat);
  destLng = toRadians(destLng);

  y = Math.sin(destLng - startLng) * Math.cos(destLat);
  x = Math.cos(startLat) * Math.sin(destLat) -
        Math.sin(startLat) * Math.cos(destLat) * Math.cos(destLng - startLng);
  brng = Math.atan2(y, x);
  brng = toDegrees(brng);
  return (brng + 360) % 360;
}

On Mon, 28 Jun 2021 at 09:59, Dave via groups.io <davidnewman55=icloud.com@groups.io> wrote:
Tried the kst2you link and it looks great. The only query is why the reciprocal bearings on such sites are never + or - 180degrees exactly as per the theory. The magnetic variation here is only 30 minutes so wouldn’t account for the differences , though of course other stations mag variation may be a lot larger I suppose. 
73 Dave G4GLT. 


On 28 Jun 2021, at 09:51, Robin Szemeti - G1YFG <robin@...> wrote:


Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: 10GHz and 2.4GHz microwave test beacons

Brian Flynn GM8BJF
 

Hi Peter

I have found a useful and cheap/simple way to generate a weak signal for the microwave bands is to drive a suitable diode in a WG mount with the output from a TCXO. Suitable diodes are the old cartridge radar mixer types.  It also helps to buffer the output of the TCXO with a TTL or CMOS gate or two. The addition of a small horn helps for antenna testing. Suitable TCXOs are available surplus. I use a 12.8 MHz one recovered from an old analogue cellphone. I find that they are useful over a 50 to 100 m range.on 10 GHz. The whole setup can be easily powered form a battery so is very portable..

73s
Brian GM8BJF


Re: New 30THz video

militaryoperator
 

Hi Ben, the really nifty work with optical comms is cloudbounce and near line of sight using atmospheric dust as a scattering medium. Cloudbounce using an array of 60 or so lenses at the transmit end was used to get 288 km across the Tasman Strait by VK7MO and his chums.  https://www.amateurradio.com/tag/cloudbounce/
I have some foot-square Fresnel lenses and very high-power red LEDs, and there are quite a few ops with red-light gear. Red-sensitive Silicon Photomultipliers are available now which match the sort of focus spot size of a Fresnel lens.
For proper power on 30 THz, there are sub-£100 watercooled CO2 laser tubes of course, but you need a fairly fancy beam expander so you don't just cut a hole through the optics. Also, the kit is about as portable as an AR88.
There are stern limits on the use of optical lasers and high intensity LED beams as a result of idiots targeting aircraft pilots, with increasingly tight controls near to airports, and I guess even 10.64 micrometre radiation from those laser tubes would be subject to the same controls despite not being a risk to pilots.
The UKNanowaves IO group is the place to gather. Much like the sub9kHz and LF groups, you'll recognise some microwave op callsigns in there.
Neil G4DBN



OMG Neil, no, I have enough to think on now without getting a toe in there, hi.

About to start my Dremel special 9Cm filter constuction, hi. 

Ben


Re: 10GHz and 2.4GHz microwave test beacons

Michael Scott
 

Hi Peter

I used to use a 1N23 type diode in a piece of WG16 waveguide and drive a few milliamps of current through it from a 144MHz transmitter ( 144 x 72 = 10368 ).

The Chipbank has a few of these diodes if you want to try it!

73, Mike, G3LYP

On 27/06/2021 20:27, Peter LB0K wrote:

Does someone have a suggestion for some sort of testing beacon I can knock up, or acquire, or even build, for checking out the 10GHz and 2.4GHz station(s) I'm putting together.

These would preferably be something simple (as can be) and battery operated. And would mainly be intended for use as confidence checkers.  I don't expect to have stations leaping out of my loudspeakers all of the time, so at least I could listen to the signals out of these units and be comforted.

Peter - LB0K


Re: My KST Experience today .......................

Dave
 

Tried the kst2you link and it looks great. The only query is why the reciprocal bearings on such sites are never + or - 180degrees exactly as per the theory. The magnetic variation here is only 30 minutes so wouldn’t account for the differences , though of course other stations mag variation may be a lot larger I suppose. 
73 Dave G4GLT. 


On 28 Jun 2021, at 09:51, Robin Szemeti - G1YFG <robin@...> wrote:


Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Re: My KST Experience today .......................

militaryoperator
 

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past


I just looked, I have/use KST2me and I have two windows, the general top one, with everyone's messages and the bottom one which is just my messages to whoever I am talking to. 

The only option I'd like, unless it's already there and I don't know about it, is to limit the range of messages I see in the top window. I don't need to see all of Europe, the chances of me working even across the North Sea are remote.

Still, it's all very helpful I guess in making contacts. 

Failed with a few on Sunday, odd as the Leic beacon was very strong with me but CLA weaker than usual. Odd old frequencies. 


Ben G4BXD


Re: My KST Experience today .......................

Robin Szemeti - G1YFG
 

Right, CQ pop-up thing done while I had my morning toast ... I fear that eats up my spare time for today, back to work!

On Mon, 28 Jun 2021 at 09:39, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:
Hi Noel,

On a really busy day, one of the problems with KST is if you are trying to chat with another user, the messages are all scrolling past ... the idea of the chat window was to ignore all that other stuff and let you just have a conversation with one user, uninterrupted by the other noise ...  I'll look at adding an "auto close chat after send" option for those that prefer to revert back to the main window.

It is slightly complicated as the chat window can be opened from either the map (click on a user, click chat), from the user list (click any callsign) or from the message log (click callsign) ... I'm not sure auto-closing makes sense in the user-list or map contexts.

On Mon, 28 Jun 2021 at 09:16, Noel G8GTZ <noel@...> wrote:
Hi Robin,

I do use your software and as far as I am concerned it is by far the best KST user interface - clean, modern, easy to understand, scalable to whatever size you want and works on a mobile phone!!

Appreciate it is very much a sideline for you and paid work takes priority but a couple of comments on the operation of the chat box.  When you click on a callsign to open the chat dialogue, can the cursor be placed in the chat window - you currently have to click again in the chat box.  Then when the message is sent, be good if the chat window was automatically closed.

Thanks again.
Noel - G8GTZ


--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG

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