Why does “Ethics and Operating Procedures” suggest tuning on a dummy load?
The seminal work "Ethics and Operating Procedures for the Radio Amateur" suggests in subsection II.8.1 to perform tuning only on a dummy load.
My understanding is that a dummy load matches the transceiver impedance so tuning is probably a) not necessary and b) without any predictive value for how the actual antenna will work with the tuning parameters.
What am I missing?
antenna equipment-operation
asked 4 hours ago
xmjx
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The seminal work "Ethics and Operating Procedures for the Radio Amateur" suggests in subsection II.8.1 to perform tuning only on a dummy load.
My understanding is that a dummy load matches the transceiver impedance so tuning is probably a) not necessary and b) without any predictive value for how the actual antenna will work with the tuning parameters.
What am I missing?
antenna equipment-operation
asked 4 hours ago
xmjx
1083
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
The seminal work "Ethics and Operating Procedures for the Radio Amateur" suggests in subsection II.8.1 to perform tuning only on a dummy load.
My understanding is that a dummy load matches the transceiver impedance so tuning is probably a) not necessary and b) without any predictive value for how the actual antenna will work with the tuning parameters.
What am I missing?
antenna equipment-operation
asked 4 hours ago
xmjx
1083
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The seminal work "Ethics and Operating Procedures for the Radio Amateur" suggests in subsection II.8.1 to perform tuning only on a dummy load.
My understanding is that a dummy load matches the transceiver impedance so tuning is probably a) not necessary and b) without any predictive value for how the actual antenna will work with the tuning parameters.
What am I missing?
antenna equipment-operation
antenna equipment-operation
asked 4 hours ago
xmjx
1083
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
xmjx
1083
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
xmjx
1083
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
xmjx
1083
asked 4 hours ago
xmjx
1083
1083
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
xmjx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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1 Answer
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The text you refer to seems to be (emphasis mine):
Sometimes before transmitting it is necessary to tune (adjust) the transmitter (or antenna tuner). Tuning should in the first instance be done on a dummy load.
This is not referring to the use of an antenna tuner, whether integral or external. Rather, it is referring to tuning the "finals" of a vacuum-tube-based transmitter. These are also impedance-matching adjustments, but involve elements internal to the transmitter rather than exclusively the transmitter to the antenna. (The antenna impedance was also involved, so in some radios there could be some amount of antenna matching, if not as much as a dedicated antenna tuner. Or so I understand — I'm not an expert on this bit of history.)
Solid-state radios operate differently and do not require these adjustments, so the recommendation you read is obsolete. However, there are still uses for transmitting into a dummy load — for example, checking if your microphone is working, you're not over-modulating, or even that a computer-controlled transmission is correctly controlling your radio's frequency and PTT.
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
That makes sense. Thank you :-)
– xmjx
4 hours ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
add a comment |
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1 Answer
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1 Answer
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oldest
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active
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active
oldest
votes
The text you refer to seems to be (emphasis mine):
Sometimes before transmitting it is necessary to tune (adjust) the transmitter (or antenna tuner). Tuning should in the first instance be done on a dummy load.
This is not referring to the use of an antenna tuner, whether integral or external. Rather, it is referring to tuning the "finals" of a vacuum-tube-based transmitter. These are also impedance-matching adjustments, but involve elements internal to the transmitter rather than exclusively the transmitter to the antenna. (The antenna impedance was also involved, so in some radios there could be some amount of antenna matching, if not as much as a dedicated antenna tuner. Or so I understand — I'm not an expert on this bit of history.)
Solid-state radios operate differently and do not require these adjustments, so the recommendation you read is obsolete. However, there are still uses for transmitting into a dummy load — for example, checking if your microphone is working, you're not over-modulating, or even that a computer-controlled transmission is correctly controlling your radio's frequency and PTT.
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
That makes sense. Thank you :-)
– xmjx
4 hours ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
add a comment |
The text you refer to seems to be (emphasis mine):
Sometimes before transmitting it is necessary to tune (adjust) the transmitter (or antenna tuner). Tuning should in the first instance be done on a dummy load.
This is not referring to the use of an antenna tuner, whether integral or external. Rather, it is referring to tuning the "finals" of a vacuum-tube-based transmitter. These are also impedance-matching adjustments, but involve elements internal to the transmitter rather than exclusively the transmitter to the antenna. (The antenna impedance was also involved, so in some radios there could be some amount of antenna matching, if not as much as a dedicated antenna tuner. Or so I understand — I'm not an expert on this bit of history.)
Solid-state radios operate differently and do not require these adjustments, so the recommendation you read is obsolete. However, there are still uses for transmitting into a dummy load — for example, checking if your microphone is working, you're not over-modulating, or even that a computer-controlled transmission is correctly controlling your radio's frequency and PTT.
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
That makes sense. Thank you :-)
– xmjx
4 hours ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
add a comment |
The text you refer to seems to be (emphasis mine):
Sometimes before transmitting it is necessary to tune (adjust) the transmitter (or antenna tuner). Tuning should in the first instance be done on a dummy load.
This is not referring to the use of an antenna tuner, whether integral or external. Rather, it is referring to tuning the "finals" of a vacuum-tube-based transmitter. These are also impedance-matching adjustments, but involve elements internal to the transmitter rather than exclusively the transmitter to the antenna. (The antenna impedance was also involved, so in some radios there could be some amount of antenna matching, if not as much as a dedicated antenna tuner. Or so I understand — I'm not an expert on this bit of history.)
Solid-state radios operate differently and do not require these adjustments, so the recommendation you read is obsolete. However, there are still uses for transmitting into a dummy load — for example, checking if your microphone is working, you're not over-modulating, or even that a computer-controlled transmission is correctly controlling your radio's frequency and PTT.
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
The text you refer to seems to be (emphasis mine):
Sometimes before transmitting it is necessary to tune (adjust) the transmitter (or antenna tuner). Tuning should in the first instance be done on a dummy load.
This is not referring to the use of an antenna tuner, whether integral or external. Rather, it is referring to tuning the "finals" of a vacuum-tube-based transmitter. These are also impedance-matching adjustments, but involve elements internal to the transmitter rather than exclusively the transmitter to the antenna. (The antenna impedance was also involved, so in some radios there could be some amount of antenna matching, if not as much as a dedicated antenna tuner. Or so I understand — I'm not an expert on this bit of history.)
Solid-state radios operate differently and do not require these adjustments, so the recommendation you read is obsolete. However, there are still uses for transmitting into a dummy load — for example, checking if your microphone is working, you're not over-modulating, or even that a computer-controlled transmission is correctly controlling your radio's frequency and PTT.
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
answered 4 hours ago
Kevin Reid AG6YO♦
15.5k32965
15.5k32965
That makes sense. Thank you :-)
– xmjx
4 hours ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
add a comment |
That makes sense. Thank you :-)
– xmjx
4 hours ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
That makes sense. Thank you :-)
– xmjx
4 hours ago
That makes sense. Thank you :-)
– xmjx
4 hours ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
Vacuum-tube based external power amplifiers are still in wide use, which require similar tuning, so the advice isn't obsolete.
– user71659
23 mins ago
add a comment |
xmjx is a new contributor. Be nice, and check out our Code of Conduct.
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