[hpsdr] Pre-Distortion

[Owen, Michael]

Dear Helmut -

Could you please add a little explanation about (a) what isolation you are referring to; and (b) why 77 dB?  I am still new to this concept.

73,
W9IP

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Helmut, DC6NY
Sent: Monday, December 09, 2013 8:24 AM
To: 'William H. Fite'; n1jez at burlingtontelecom.net
Cc: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pre-Distortion

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Hi Bill,

be carefully with this device! 50 dB isolation is NOT enough. For legal power amps we need at least 77 dB. Bird 4275 seems fine with rated attenuation 35- 80 dB, depending how deep the coupling element is diving toward the transmission line. But the device is not rated for frequencies below 20 MHz.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von William H. Fite
Gesendet: Montag, 9. Dezember 2013 13:48
An: n1jez at burlingtontelecom.net
Cc: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Pre-Distortion

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