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Why, oh why?
开云体育The Hidden Wonders of the Sky
Andrew Thornett, March 2025
Why, oh why, can they not see – Beacons blink in cosmic song, Celestial signals, faint yet bright, Daring pulses race through space, Echoes trace a past unknown, Far beyond the eye’s own reach, Gazing upward, lost in thought, Would they listen? Would they care? |
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Hi Andrew Not spoken for a long time, have you taken to poetry now as well as .....? I saw the first 15 mins or so of your new Group re 1420 MHz.? Viewing the recorded version this morninng, maybe I did not login correctly though what I saw was hard work, meaning Noisey and lack of resolution in the picture, so when Lunchtime was announced I switched off ! Incidentally,?Paul and Heather attend our local Amateur Radio club, near Hereford. Heather played a big part in writing?the code for 4m meteor?detection receiver, where the time of signal transmission is embedded in the transmitted signal. Very convenient for working out time of flight and calculating distance. Co-axial cable Impedance.? Matching impedance is not too critical when you are not transmitting POWER. where out of phase reflections can cause much higher voltages to be created often referred?to as Meltdown especially where semiconductors are used. In days of old when Valves were the norm, Flashovers or 'arcing' (across air spaced capacitors) were common.? Especially when It was common to have a few hundred volts (or more) in the PA stage of a transmitter.? That takes me back to a time when I was a young trainee engineer, now a very long time ago. If using various cables for a Receiver's input, it is the integrity of the co-axial cables inner and outer and their isolation from Ground that matter.? as well being able to carry a radio signal at the frequency of interest.? Also the avoidance of interference or noise? 'QRM',? ?this latter term is from amateur radio and/or HM forces.? Best wishes Norman? ?M0SXF On Sun, Mar 9, 2025 at 11:33?PM Andrew Thornett via <andrew=[email protected]> wrote:
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Norman? |
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From: [email protected] <[email protected]> on behalf of Norman Pomfret via groups.io <norman.pomfret1@...>
Sent: Friday, March 21, 2025 5:48:07 PM To: [email protected] <[email protected]> Subject: Re: [baa-rag] Why, oh why? ?
Hi Andrew
Not spoken for a long time, have you taken to poetry now as well as .....?
I saw the first 15 mins or so of your new Group re 1420 MHz.? Viewing the recorded version this morninng, maybe I did not login correctly though what I saw was hard work, meaning Noisey and lack of resolution in the picture, so when Lunchtime was announced
I switched off !
Incidentally,?Paul and Heather attend our local Amateur Radio club, near Hereford. Heather played a big part in writing?the code for 4m meteor?detection receiver, where the time of signal transmission is embedded in the transmitted signal. Very convenient
for working out time of flight and calculating distance.
Co-axial cable Impedance.? Matching impedance is not too critical when you are not transmitting POWER. where out of phase reflections can cause much higher voltages to be created often referred?to as Meltdown especially where semiconductors are
used. In days of old when Valves were the norm, Flashovers or 'arcing' (across air spaced capacitors) were common.? Especially when It was common to have a few hundred volts (or more) in the PA stage of a transmitter.? That takes me back to a time when I was
a young trainee engineer, now a very long time ago.
If using various cables for a Receiver's input, it is the integrity of the co-axial cables inner and outer and their isolation from Ground that matter.? as well being able to carry a radio signal at the frequency of interest.? Also the avoidance of interference
or noise? 'QRM',? ?this latter term is from amateur radio and/or HM forces.?
Best wishes
Norman? ?M0SXF
On Sun, Mar 9, 2025 at 11:33?PM Andrew Thornett via
<andrew=[email protected]> wrote:
Norman?
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开云体育Can you tell me more about the problem you had watching the video from the group? I have gone onto Youtube and the video is smooth and seems easy to view and hear. Isn’t that the case for you? Andy ? From: [email protected] <[email protected]>
On Behalf Of Andrew Thornett via groups.io
Sent: 21 March 2025 21:11 To: [email protected] Subject: Re: [baa-rag] Why, oh why? ? Thanks Norman. I'll have a look at that recording to see what you mean..... ? Sent from From:
[email protected] <[email protected]> on behalf of Norman Pomfret via groups.io <norman.pomfret1@...> ? Hi Andrew ? Not spoken for a long time, have you taken to poetry now as well as .....? ? I saw the first 15 mins or so of your new Group re 1420 MHz.? Viewing the recorded version this morninng, maybe I did not login correctly though what I saw was hard work, meaning Noisey and lack of resolution in the picture, so when Lunchtime was announced I switched off ! ? Incidentally,?Paul and Heather attend our local Amateur Radio club, near Hereford. Heather played a big part in writing?the code for 4m meteor?detection receiver, where the time of signal transmission is embedded in the transmitted signal. Very convenient for working out time of flight and calculating distance. ? Co-axial cable Impedance.? Matching impedance is not too critical when you are not transmitting POWER. where out of phase reflections can cause much higher voltages to be created often referred?to as Meltdown especially where semiconductors are used. In days of old when Valves were the norm, Flashovers or 'arcing' (across air spaced capacitors) were common.? Especially when It was common to have a few hundred volts (or more) in the PA stage of a transmitter.? That takes me back to a time when I was a young trainee engineer, now a very long time ago. ? If using various cables for a Receiver's input, it is the integrity of the co-axial cables inner and outer and their isolation from Ground that matter.? as well being able to carry a radio signal at the frequency of interest.? Also the avoidance of interference or noise? 'QRM',? ?this latter term is from amateur radio and/or HM forces.? ? Best wishes Norman? ?M0SXF ? ? ? ? ? On Sun, Mar 9, 2025 at 11:33?PM Andrew Thornett via <andrew=[email protected]> wrote:
? -- Norman? |
开云体育Andrew, ? The audio from the other attendees is very low, they are hard to hear. Your audio is fine. ? There is a persistent background “hum” which is quite audible, try listening to the middle, and?end of the video. ? Video resolution and quality is fine. ? Jonathan ? From: [email protected] <[email protected]> On Behalf Of Andrew Thornett via groups.io
Sent: Friday, March 21, 2025 4:18 PM To: '[email protected]' <[email protected]> Subject: Re: [baa-rag] Why, oh why? ? Can you tell me more about the problem you had watching the video from the group? I have gone onto Youtube and the video is smooth and seems easy to view and hear. Isn’t that the case for you? Andy ? From: [email protected] <[email protected]> On Behalf Of Andrew Thornett via groups.io ? Thanks Norman. I'll have a look at that recording to see what you mean..... ? Sent from From: [email protected] <[email protected]> on behalf of Norman Pomfret via groups.io <norman.pomfret1@...> ? Hi Andrew ? Not spoken for a long time, have you taken to poetry now as well as .....? ? I saw the first 15 mins or so of your new Group re 1420 MHz.? Viewing the recorded version this morninng, maybe I did not login correctly though what I saw was hard work, meaning Noisey and lack of resolution in the picture, so when Lunchtime was announced I switched off ! ? Incidentally,?Paul and Heather attend our local Amateur Radio club, near Hereford. Heather played a big part in writing?the code for 4m meteor?detection receiver, where the time of signal transmission is embedded in the transmitted signal. Very convenient for working out time of flight and calculating distance. ? Co-axial cable Impedance.? Matching impedance is not too critical when you are not transmitting POWER. where out of phase reflections can cause much higher voltages to be created often referred?to as Meltdown especially where semiconductors are used. In days of old when Valves were the norm, Flashovers or 'arcing' (across air spaced capacitors) were common.? Especially when It was common to have a few hundred volts (or more) in the PA stage of a transmitter.? That takes me back to a time when I was a young trainee engineer, now a very long time ago. ? If using various cables for a Receiver's input, it is the integrity of the co-axial cables inner and outer and their isolation from Ground that matter.? as well being able to carry a radio signal at the frequency of interest.? Also the avoidance of interference or noise? 'QRM',? ?this latter term is from amateur radio and/or HM forces.? ? Best wishes Norman? ?M0SXF ? ? ? ? ? On Sun, Mar 9, 2025 at 11:33?PM Andrew Thornett via <andrew=[email protected]> wrote:
? -- Norman? |
|
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> on behalf of Jonathan Pettingale via groups.io <jpettingale@...>
Sent: Friday, March 21, 2025 9:55:01 PM To: [email protected] <[email protected]> Subject: Re: [baa-rag] Why, oh why? ?
Andrew, ? The audio from the other attendees is very low, they are hard to hear. Your audio is fine. ? There is a persistent background “hum” which is quite audible, try listening to the middle, and?end of the video. ? Video resolution and quality is fine. ? Jonathan ? From: [email protected] <[email protected]>
On Behalf Of Andrew Thornett via groups.io ? Can you tell me more about the problem you had watching the video from the group? I have gone onto Youtube and the video is smooth and seems easy to view and hear. Isn’t that the case for you? Andy ? From:
[email protected] <[email protected]>
On Behalf Of Andrew Thornett via groups.io ? Thanks Norman. I'll have a look at that recording to see what you mean..... ? Sent from From:
[email protected] <[email protected]> on behalf of Norman Pomfret via groups.io <norman.pomfret1@...> ? Hi Andrew ? Not spoken for a long time, have you taken to poetry now as well as .....? ? I saw the first 15 mins or so of your new Group re 1420 MHz.? Viewing the recorded version this morninng, maybe I did not login correctly though what I saw was hard work, meaning Noisey and lack of resolution in the picture, so when Lunchtime was announced I switched off ! ? Incidentally,?Paul and Heather attend our local Amateur Radio club, near Hereford. Heather played a big part in writing?the code for 4m meteor?detection receiver, where the time of signal transmission is embedded in the transmitted signal. Very convenient for working out time of flight and calculating distance. ? Co-axial cable Impedance.? Matching impedance is not too critical when you are not transmitting POWER. where out of phase reflections can cause much higher voltages to be created often referred?to as Meltdown especially where semiconductors are used. In days of old when Valves were the norm, Flashovers or 'arcing' (across air spaced capacitors) were common.? Especially when It was common to have a few hundred volts (or more) in the PA stage of a transmitter.? That takes me back to a time when I was a young trainee engineer, now a very long time ago. ? If using various cables for a Receiver's input, it is the integrity of the co-axial cables inner and outer and their isolation from Ground that matter.? as well being able to carry a radio signal at the frequency of interest.? Also the avoidance of interference or noise? 'QRM',? ?this latter term is from amateur radio and/or HM forces.? ? Best wishes Norman? ?M0SXF ? ? ? ? ? On Sun, Mar 9, 2025 at 11:33?PM Andrew Thornett via <andrew=[email protected]> wrote:
? -- Norman? |