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Testing group delay - RF Cafe Forums
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| jom
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Post subject: Testing group delay
Posted: Tue Oct 16, 2007 1:26 am
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| Captain |
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Joined: Fri Jan 26, 2007
2:40 am
Posts: 23 |
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Hello
I've got a superhet radio that has
a group delay spec. We need to test this and I'm
a bit confounded on how to do so.
Let's
say that the input is at 30 MHz, it first gets up
converted to 70 MHz IF (all the selectivity is done
here) then is down converted to 50 kHz or so. Now,
how does one test the group delay for this? What
if you just wanted to test the time delay. How would
that be done?
Thanks
jom
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jom |
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Post subject:
Posted: Mon Oct 29, 2007 2:13 pm
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| Captain |
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Joined: Fri Jan 26, 2007
2:40 am
Posts: 23 |
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OK, I'm not getting any response. This seems like
a difficult task.
I'll simplify. How would
one test a receiver noise figure which has an input
of 30MHz and output at 50kHz? I think the frequency
translation is the difficult part here so how is
this normally tested? Whether it's NF or group delay
or ripple or anything else it seems that testing
under frequency translation is difficult.
Any ideas?
Thanks
jom
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nubbage |
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Post subject:
Posted: Tue Oct 30, 2007 5:26 am
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| General |
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 268
Location: London UK
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Posted 11/12/2012
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