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Re: [Discuss-gnuradio] AR5000 and downconversion
From: |
Dave Emery |
Subject: |
Re: [Discuss-gnuradio] AR5000 and downconversion |
Date: |
Wed, 14 May 2003 23:30:05 -0400 |
User-agent: |
Mutt/1.4.1i |
On Wed, May 14, 2003 at 09:36:36PM -0400, John R. Ackermann N8UR wrote:
> Hi Alan --
>
> I doubt you'll find many radios that support a 6-7MHz bandwidth around a
> 10.7MHz IF. That's way too great a percentage of the center frequency for
> traditional radio design to work with. I suspect the 10.7 IF in the AR5000
> is not going to be able to handle more than NBFM, or at most WBFM (eg,
> 200kHz or so) bandwidth without major surgery that would likely render the
> radio useless for normal tasks. A radio that supports TV bandwidths is
> likely to have a much higher IF, anywhere from 45 to 70MHz or higher.
>
> John
Not true. The ICOM R-7000 and R-7100 and I believe the R-8500
all were designed to be optionally used with an external NTSC video
demodulator boz that hooks up to the 10.7 mhz output. This implies
a 6 mhz bandwidth at the 10.7 mhz output and this matches my sxperiance
with these radios.
I don't happen to currently own a AOR-5000 family radio,
but I am pretty sure its 10.7 mhz IF output is comparable.
All of these outputs are before much of the IF gain, most of the
AGC action and were designed for use with wideband demods such as NTSC
video demods and also with spectrum display scopes (panadapters).
--
Dave Emery N1PRE, address@hidden DIE Consulting, Weston, Mass 02493
PGP fingerprint 1024D/8074C7AB 094B E58B 4F74 00C2 D8A6 B987 FB7D F8BA 8074 C7AB
- [Discuss-gnuradio] AR5000 and downconversion, Alan Gray, 2003/05/14
- Re: [Discuss-gnuradio] AR5000 and downconversion, brian whitaker, 2003/05/14
- Re: [Discuss-gnuradio] AR5000 and downconversion, Alan Gray, 2003/05/14
- Re: [Discuss-gnuradio] AR5000 and downconversion, John R. Ackermann N8UR, 2003/05/14
- Re: [Discuss-gnuradio] AR5000 and downconversion,
Dave Emery <=
- Re: [Discuss-gnuradio] AR5000 and downconversion, Krzysztof Kamieniecki, 2003/05/14
- Re: [Discuss-gnuradio] AR5000 and downconversion, Joseph DiVerdi, 2003/05/15
- Re: [Discuss-gnuradio] AR5000 and downconversion, Joshua Lackey, 2003/05/15
- Re: [Discuss-gnuradio] AR5000 and downconversion, Krzysztof Kamieniecki, 2003/05/15
- Re: [Discuss-gnuradio] AR5000 and downconversion, Joshua Lackey, 2003/05/15
- Re: [Discuss-gnuradio] AR5000 and downconversion, Krzysztof Kamieniecki, 2003/05/15
- Re: [Discuss-gnuradio] AR5000 and downconversion, John Gilmore, 2003/05/15
Re: [Discuss-gnuradio] AR5000 and downconversion, Henrique Miranda, 2003/05/14
Re: [Discuss-gnuradio] AR5000 and downconversion, Robert Kelley, 2003/05/14