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1234: Difference between revisions
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|model=1234 | |model=1234 | ||
|class=detectors amplifiers | |class=detectors amplifiers | ||
|summary= | |summary=Standing-wave meter | ||
|image=GR 1234 Front Close-up.jpg | |image=GR 1234 Front Close-up.jpg | ||
|caption=General Radio 1234 Standing-Wave Meter | |caption=General Radio 1234 Standing-Wave Meter | ||
| Line 15: | Line 15: | ||
The {{Title|General Radio 1234 Standing-Wave Meter}} was introduced in {{Catalog T}} and remained available through {{Catalog 1978}}. | The {{Title|General Radio 1234 Standing-Wave Meter}} was introduced in {{Catalog T}} and remained available through {{Catalog 1978}}. | ||
It is a low-noise, three-stage tuned amplifier operating at 1 kHz, designed to measure standing waves (maxima and minima) | |||
when paired with a slotted line like the [[874-LB]] and either a crystal rectifier or a bolometer used as a detector. | |||
The panel meter is equipped with lamps at the far end of each scale to indicate which detector is in use. | |||
There are also AC and DC outputs for use with a recorder. | |||
==Specifications== | ==Specifications== | ||
* '''Meter Scales VSWR:''' 1 to 4, 3.2 to 10, 1 to 1.2, and 1 to 1.05;dB, 0 to 10, 0 to 1.6, and 0 to 0.45 | * '''Meter Scales VSWR:''' 1 to 4, 3.2 to 10, 1 to 1.2, and 1 to 1.05;dB, 0 to 10, 0 to 1.6, and 0 to 0.45 | ||
* '''Meter Scale Bolometer:''' current, 0 to 10 mA | * '''Meter Scale Bolometer:''' current, 0 to 10 mA | ||
* '''Meter Accuracy:''' 0 to 10 dB scale, ±(0.01 dB + 2% of reading);0 to 1.6 dB scale, ±0.02 dB; 0 to 0.45 dB scale, ±0.007 dB | * '''Meter Accuracy:''' 0 to 10 dB scale, ±(0.01 dB + 2% of reading);0 to 1.6 dB scale, ±0.02 dB; 0 to 0.45 dB scale, ±0.007 dB | ||
* '''Bandwidth:''' 10 to 100 Hz, adjustable with constant gain | * '''Bandwidth:''' 10 to 100 Hz, adjustable with constant gain | ||
* '''Frequency:''' 1 kHz, adjustable ±30 Hz | * '''Frequency:''' 1 kHz, adjustable ±30 Hz | ||
==Links== | ==Links== | ||
* [[Media:GR Exp 1234 SWR 02_1968.pdf|Experimenter describing Type 1234 | * [[Media:GR Exp 1234 SWR 02_1968.pdf|Experimenter February 1968 describing Type 1234]] | ||
==Photos== | ==Photos== | ||