From scr287 at att.net  Wed Apr 28 12:48:33 2021
From: scr287 at att.net (Jack Antonio)
Date: Wed, 28 Apr 2021 16:48:33 +0000 (UTC)
Subject: [Motorola] TU255 Cavity
References: <980739283.937209.1619628513582.ref@mail.yahoo.com>
Message-ID: <980739283.937209.1619628513582@mail.yahoo.com>

Anyone have any documentation on these cavities
and/or their use in duplexers? Info such as cable
lengths, insertion loss, etc.

Thanks in advance

Jack Antonio
WA7DIA

From w4tas at gte.net  Wed Apr 28 13:04:14 2021
From: w4tas at gte.net (w4tas at gte.net)
Date: Wed, 28 Apr 2021 17:04:14 +0000 (UTC)
Subject: [Motorola] TU255 Cavity
In-Reply-To: <980739283.937209.1619628513582@mail.yahoo.com>
References: <980739283.937209.1619628513582.ref@mail.yahoo.com>
	<980739283.937209.1619628513582@mail.yahoo.com>
Message-ID: <1368905562.933054.1619629454583@mail.yahoo.com>

looks like a tunable bandpass filter for UHF.?It is not a duplexer cavity.?The "Q" and thru put loss can be easily measured.?Cable lengths are not critical in a bandpass filter application.?It would be used ahead of a receiver to eliminate out of band signals.?Stated range is 400 to 470 MHz which covers the 70 cm ham band.
Tony


-----Original Message-----
From: Jack Antonio <scr287 at att.net>
To: motorola at mailman.qth.net
Sent: Wed, Apr 28, 2021 12:48 pm
Subject: [Motorola] TU255 Cavity

Anyone have any documentation on these cavities
and/or their use in duplexers? Info such as cable
lengths, insertion loss, etc.

Thanks in advance

Jack Antonio
WA7DIA
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