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IEM FFT scan
Henry Cohen:
--- Quote from: Ike Zimbel on February 12, 2023, 10:12:04 PM ---Good to know. That said, that means it could and would be a Tx frequency in a handheld walkie-talkie, yes?
--- End quote ---
Yes. Out in The Real World of RF® "outbound" always means the fixed base station transmit while "inbound" always means the portable/mobile/subscriber unit transmit.
Whereas downlink and uplink are mostly analogous to outbound and inbound respectively, it's reversed when taking about satellites; the satellite being the 'fixed base station' (repeater actually), even though the 'subscriber' is in fact the fixed [generally] Earth station.
Ike Zimbel:
--- Quote from: Henry Cohen on February 13, 2023, 04:42:43 PM ---Yes. Out in The Real World of RF® "outbound" always means the fixed base station transmit while "inbound" always means the portable/mobile/subscriber unit transmit.
--- End quote ---
So this means that, if you have control over it, you really do not want the audio crew to end up on that Walkie-Talkie channel, especially if you/they are using G10 or other 470 MHz band equipment. Imagine an ME wearing a radio that transmits at 469.9875, at, say, 2 watts, or even 1W, and a cue mix pack tuned to 470.125 MHz...
Henry Cohen:
--- Quote from: Ike Zimbel on February 13, 2023, 07:26:41 PM --- So this means that, if you have control over it, you really do not want the audio crew to end up on that Walkie-Talkie channel, especially if you/they are using G10 or other 470 MHz band equipment. Imagine an ME wearing a radio that transmits at 469.9875, at, say, 2 watts, or even 1W, and a cue mix pack tuned to 470.125 MHz...
--- End quote ---
If the ME is wearing an IEM receiver and keys up a 2W radio next to it, it doesn't matter what the frequency separation is; that much RF power next to a sensitive receiver will absolutely de-sense it and there's a good chance fry the front end.
Russell Ault:
--- Quote from: Henry Cohen on February 13, 2023, 08:35:14 PM ---{...} and there's a good chance fry the front end.
--- End quote ---
This bit surprised me! I would have figured that the front end of an IEM pack would be able to handle a 2W TX being nearby (non-destructively, anyway), especially since that's not even 10dB hotter than a 250mW IEM TX (and people make mistakes...). Have you seen an IEM pack that's been fried by an LMR?
-Russ
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