RadioBanter - IF question

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July 1st 05 03:10 PM

IF question

Hi Group,

Radios like my FT-757 and FT-101 have an IF output. If I take this
output to a spectrum analyizer and the SA center frequency is set the
same as the IF frequency, will I have a spectrum monitor which will
display over the complete bandwidth?

If so, is the BW of an IF generally large enought to view the complete
band?

de KJ4UO

Mike Andrews

July 1st 05 03:30 PM

wrote:
Hi Group,

Radios like my FT-757 and FT-101 have an IF output. If I take this
output to a spectrum analyizer and the SA center frequency is set the
same as the IF frequency, will I have a spectrum monitor which will
display over the complete bandwidth?

If so, is the BW of an IF generally large enought to view the complete
band?

You'll see the IF bandwidth if the SA is set that wide or wider; otherwise,
you'll just see the SA bandwidth.

Most receiver IF bandwidths aren't particularly wide; some are, but they're
designed for it. The receiver specs may (and, IIRC, typically do) show IF
bandwidth.

--
On a Tee-shirt:
"I am a bomb technician. If you see
me running, try to keep up. "

Joe McElvenney

July 1st 05 06:20 PM

Hi,

Radios like my FT-757 and FT-101 have an IF output. If I take this
output to a spectrum analyizer and the SA center frequency is set the
same as the IF frequency, will I have a spectrum monitor which will
display over the complete bandwidth?

While it will obviously depend on the particular radio, a lot
of rigs take their output from in front of the first IF filter and
so can diplay several MHz either side of center. My Kenwood
TS-850S(AT) and HP141T combo works fine in this way.

Cheers - Joe, G3LLV

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