[amsat-bb] Shack re-wiring: RTL-SDR options?
kq6ea at verizon.net
Fri Mar 3 05:18:12 UTC 2017
I know there are plans for simple upconverters out there, but I've never
I've owned most of the SDR receivers out there, from $5 dongles to both
FunCube dongles, the HackRF One, SDRplay, and now the AirSpy. Depending
on what you want to use them for, and *where* you're located, they can
be really cool, or a disappointment.
Here in the RF Alley of SoCal, the cheap dongles can really fold up on
strong signals many, many MHz away from the signal-of-interest.
On 03/03/2017 04:40 AM, Greg D wrote:
> Well, that answers that question. Thanks, Jim. You are correct! 24.00
> is the minimum Gqrx will let it go.
> Greg KO6TH
> Jim Jerzycke wrote:
>> I don't think an RTL dongle will tune down that low.
>> Jim KQ6EA
>> On 03/02/2017 10:46 PM, Greg D wrote:
>>> Hi folks,
>>> Has anyone used an RTL-SDR dongle on the 10.7 MHz IF output from another
>>> receiver? Is that better than going direct?
>>> My cable TV provider is forcing us to go all-digital. With the new
>>> "cable box" comes the opportunity to re-wire the shack and simplify the
>>> many layers of cables, splitters, and lash-ups that have accumulated
>>> over the years. The proverbial camel is crying out for help.
>>> What this has to do with Ham Radio is that part of the lash-up mess is
>>> an old pre-CATV deep fringe TV antenna that I have in the attic, aimed
>>> to the southern horizon. We are well outside the range of any of the
>>> digital OTA stations, and never one to leave a perfectly good piece of
>>> RF equipment go to waste, I currently have it fed to an old Icom R-7000
>>> scanning receiver (previously used as the AO-40 downlink IF) and to an
>>> RTL-SDR dongle by way of a TV 2:1 splitter. I've tried hooking the
>>> dongle directly to my 2m ham antenna for satellite use, but for some
>>> reason that was less than satisfactory. Never really did hear much of
>>> anything, and never could figure out why. At least with the TV antenna,
>>> I can copy some stuff with the dongle, though the Icom is generally
>>> better. But the Icom doesn't do the various digital modes that are
>>> better suited for SDR.
>>> Looking at the back of the Icom, I see that it has a 10.7 MHz IF output,
>>> so the thought is that the SDR dongle might perform better hooked there
>>> (with a DC bias block) instead of to the antenna itself through the
>>> splitter. Both receivers have similar frequency coverage, but perhaps
>>> the Icom, while somewhat deaf by modern standards, might still make for
>>> a better front-end to the dongle?
>>> I think the down-side is that the Icom's IF bandpass is narrower than
>>> the Dongle's, so I'd lose some flexibility there. I would also lose the
>>> ability to software-control the frequency of the receive chain, outside
>>> of the IF bandpass.
>>> What do you think? Would this be a net win or loss for the RTL-SDR?
>>> Greg KO6TH
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>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
>> Opinions expressed
>> are solely those of the author, and do not reflect the official views
>> of AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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