Tnx for reply Marcus...... ok, was wondering about that..... i also checked
out the Icom 1500 SDR unit and Icom says that a very broad range of
spectrum can be scanned in about a second by setting the upper and lower
band limits. This unit covers up to 3 GHz also.
On Sat, Nov 10, 2012 at 4:29 PM, Marcus D. Leech <patchvonbr...@gmail.com>wrote:
>> Greetings All,
>> Is anyone using using the RFSPACE SDR IQ for rcvr ? Im wondering how
>> well it is working out ?
>> Tnx
>> Den
> Nice device, but only designed for direct-tuning to 30Mhz, and only 190kHz
> of instantaneous bandwidth.
> I'm not immediately aware of anyone using it for radio astronomy, but that
> doesn't mean it couldn't, subject to
> the above limitations.
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
> --
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> Tnx for reply Marcus...... ok, was wondering about that..... i also > checked out the Icom 1500 SDR unit and Icom says that a very broad > range of spectrum can be scanned in about a second by setting the > upper and lower band limits. This unit covers up to 3 GHz also.
For spectral observations, you'd really prefer something that can cover the entire spectrum simultaneously -- this gives much better
sensitivity, which is why, for spectral observations, you want an SDR with high instantaneous bandwidth.
Further, for continuum observations, you want more bandwidth as well, since sensitivity is proportional to bandwidth, and for an SDR
receiver the bandwidth is directly equal to the SPS delivered to the software.
> On Sat, Nov 10, 2012 at 4:29 PM, Marcus D. Leech > <patchvonbr...@gmail.com <mailto:patchvonbr...@gmail.com>> wrote:
> On 11/10/2012 08:24 PM, Den Koawl wrote:
> Greetings All,
> Is anyone using using the RFSPACE SDR IQ for rcvr ? Im
> wondering how well it is working out ?
> Tnx
> Den
> Nice device, but only designed for direct-tuning to 30Mhz, and
> only 190kHz of instantaneous bandwidth.
> I'm not immediately aware of anyone using it for radio astronomy,
> but that doesn't mean it couldn't, subject to
> the above limitations.
> -- > Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
> -- > You received this message because you are subscribed to the Google
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-- Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
I'm using a QS1R SDR for my work, which has an instantaneous bandwidth of 2.5 MHz that is important for radio astronomy (as mentioned by Marcus below). Additional hardware is needed to receive beyond 62 MHz and my approach toward doing this is described in detail on my website (https://sites.google.com/site/amateurradiointerferometry/file-cabinet).
David Hi, and tnx for info...... i did take a look at the QS1R, but the
price is a little high for me, at the moment. For the price, that thing
should cover more spectrum ( i think ), so for now i have to settle for
using the Realtech USB SDR device and the associated software for it. I may
end up getting that QS1R someday or the RASDR when it is available.
On Mon, Nov 12, 2012 at 6:44 AM, David L, N5OIQ <dmlon...@gmail.com> wrote:
> Ken,
> I'm using a QS1R SDR for my work, which has an instantaneous bandwidth of
> 2.5 MHz that is important for radio astronomy (as mentioned by Marcus
> below). Additional hardware is needed to receive beyond 62 MHz and my
> approach toward doing this is described in detail on my website (
> https://sites.google.com/site/amateurradiointerferometry/file-cabinet).
> David
> On Saturday, November 10, 2012 7:24:16 PM UTC-6, Den Koawl wrote:
>> Greetings All,
>> Is anyone using using the RFSPACE SDR IQ for rcvr ? Im wondering how
>> well it is working out ?
>> Tnx
>> Den
> --
> You received this message because you are subscribed to the Google
> Groups "Society of Amateur Radio Astronomers" group.
> To post to this group, send email to sara-list@googlegroups.com
> To unsubscribe from this group, send email to
> sara-list-unsubscribe@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/sara-list?hl=en
I've got a RTLSDR dongle myself and they are good little radios with a large instantaneous bandwidth. It has been a while since I've played around with my RTLSDR and I could see that it has some issues with automatic gain control that couldn't be disabled. Perhaps someone here in the group would know if AGC can be disabled on these things?
On Monday, November 12, 2012 10:01:10 PM UTC-6, Den Koawl wrote:
> David Hi, and tnx for info...... i did take a look at the QS1R, but the > price is a little high for me, at the moment. For the price, that thing > should cover more spectrum ( i think ), so for now i have to settle for > using the Realtech USB SDR device and the associated software for it. I may > end up getting that QS1R someday or the RASDR when it is available.
> Tnx for info. > 73 > Den
> On Mon, Nov 12, 2012 at 6:44 AM, David L, N5OIQ <dmlo...@gmail.com<javascript:> > > wrote:
>> Ken,
>> I'm using a QS1R SDR for my work, which has an instantaneous bandwidth of >> 2.5 MHz that is important for radio astronomy (as mentioned by Marcus >> below). Additional hardware is needed to receive beyond 62 MHz and my >> approach toward doing this is described in detail on my website ( >> https://sites.google.com/site/amateurradiointerferometry/file-cabinet).
>> David
>> On Saturday, November 10, 2012 7:24:16 PM UTC-6, Den Koawl wrote:
>>> Greetings All,
>>> Is anyone using using the RFSPACE SDR IQ for rcvr ? Im wondering how >>> well it is working out ?
>>> Tnx >>> Den
>> -- >> You received this message because you are subscribed to the Google >> Groups "Society of Amateur Radio Astronomers" group. >> To post to this group, send email to sara...@googlegroups.com<javascript:> >> To unsubscribe from this group, send email to >> sara-list-...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/sara-list?hl=en
> I've got a RTLSDR dongle myself and they are good little radios with a > large instantaneous bandwidth. It has been a while since I've played > around with my RTLSDR and I could see that it has some issues with > automatic gain control that couldn't be disabled. Perhaps someone > here in the group would know if AGC can be disabled on these things?
> David
One has been able to disable AGC, via software, on the RTLSDR for several months. I poked and prodded pretty hard to get them to
figure out how to do that, and then implement it.
Both the E4K and R820T - based dongles can have fully-manual gain control. The FC0013/FC0012/FC2580-based dongles don't have
manual gain control. But most of them out there are E4K (rarer now) and R820T (very common).
I'm using an RTL based dongle for my back-yard 400Mhz RT, and also the SBRAC site will be using 14 of them to process data from the
feed.
-- Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
I see, well im not sure what software you are using with it, but i
downloaded the SDRSharp pkg, and it has a tick box which disables
AGC........ i cant remember the website now that i downloaded from but i
can look for it again if this helps ?
On Tue, Nov 13, 2012 at 5:29 AM, David L, N5OIQ <dmlon...@gmail.com> wrote:
> Den,
> I've got a RTLSDR dongle myself and they are good little radios with a
> large instantaneous bandwidth. It has been a while since I've played
> around with my RTLSDR and I could see that it has some issues with
> automatic gain control that couldn't be disabled. Perhaps someone here in
> the group would know if AGC can be disabled on these things?
> David
> On Monday, November 12, 2012 10:01:10 PM UTC-6, Den Koawl wrote:
>> David Hi, and tnx for info...... i did take a look at the QS1R, but the
>> price is a little high for me, at the moment. For the price, that thing
>> should cover more spectrum ( i think ), so for now i have to settle for
>> using the Realtech USB SDR device and the associated software for it. I may
>> end up getting that QS1R someday or the RASDR when it is available.
>> Tnx for info.
>> 73
>> Den
>> On Mon, Nov 12, 2012 at 6:44 AM, David L, N5OIQ <dmlo...@gmail.com>wrote:
>>> On Saturday, November 10, 2012 7:24:16 PM UTC-6, Den Koawl wrote:
>>>> Greetings All,
>>>> Is anyone using using the RFSPACE SDR IQ for rcvr ? Im wondering how
>>>> well it is working out ?
>>>> Tnx
>>>> Den
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "Society of Amateur Radio Astronomers" group.
>>> To post to this group, send email to sara...@googlegroups.com
>>> To unsubscribe from this group, send email to
>>> sara-list-...@**googlegroups.com
>> --
> You received this message because you are subscribed to the Google
> Groups "Society of Amateur Radio Astronomers" group.
> To post to this group, send email to sara-list@googlegroups.com
> To unsubscribe from this group, send email to
> sara-list-unsubscribe@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/sara-list?hl=en
Den, I found that "AGC control" in these off the shelf products is sometimes very deceptive. They say AGC on/off, but what they mean is AGC fast/slow. Icom receivers are the worst offenders for this. It took 2 years and dozens of emails before a tech at Icom finally admitted this to me!
Dave
This message was NOT sent from my Blackberry *********************************** *****I'm not dead, yet!************ ***********************************
Dave Ocame, WS1ETI
Stony Creek Observatory FN31og -72.834 longitude 41.272 latitude
Member: The SETILeague, Inc. (Awards Chair), The Society for Amateur Radio Astronomy (SARA), The International Trumpet Guild, Shoreline Jazz Collective, and The Connecticut Symphonic Winds
>________________________________ > From: Den Koawl <dko...@gmail.com> >To: sara-list@googlegroups.com >Sent: Tuesday, November 13, 2012 11:37 PM >Subject: Re: [SARA] Re: SDR IQ
>I see, well im not sure what software you are using with it, but i downloaded the SDRSharp pkg, and it has a tick box which disables AGC........ i cant remember the website now that i downloaded from but i can look for it again if this helps ?
>On Tue, Nov 13, 2012 at 5:29 AM, David L, N5OIQ <dmlon...@gmail.com> wrote:
>Den,
>>I've got a RTLSDR dongle myself and they are good little radios with a large instantaneous bandwidth. It has been a while since I've played around with my RTLSDR and I could see that it has some issues with automatic gain control that couldn't be disabled. Perhaps someone here in the group would know if AGC can be disabled on these things?
>>David >>
>>On Monday, November 12, 2012 10:01:10 PM UTC-6, Den Koawl wrote: >>David Hi, and tnx for info...... i did take a look at the QS1R, but the price is a little high for me, at the moment. For the price, that thing should cover more spectrum ( i think ), so for now i have to settle for using the Realtech USB SDR device and the associated software for it. I may end up getting that QS1R someday or the RASDR when it is available.
>>>Tnx for info. >>>73 >>>Den
>>>On Mon, Nov 12, 2012 at 6:44 AM, David L, N5OIQ <dmlo...@gmail.com> wrote:
>>>Ken,
>>>>I'm using a QS1R SDR for my work, which has an instantaneous bandwidth of 2.5 MHz that is important for radio astronomy (as mentioned by Marcus below). Additional hardware is needed to receive beyond 62 MHz and my approach toward doing this is described in detail on my website (https://sites.google.com/site/amateurradiointerferometry/file-cabinet).
>>>>David
>>>>On Saturday, November 10, 2012 7:24:16 PM UTC-6, Den Koawl wrote: >>>>Greetings All,
>>>>>Is anyone using using the RFSPACE SDR IQ for rcvr ? Im wondering how well it is working out ?
>>>>>Tnx >>>>>Den -- >>>>You received this message because you are subscribed to the Google >>>>Groups "Society of Amateur Radio Astronomers" group.
To post to this group, send email to sara...@googlegroups.com
>>-- >>You received this message because you are subscribed to the Google >>Groups "Society of Amateur Radio Astronomers" group. >>To post to this group, send email to sara-list@googlegroups.com >>To unsubscribe from this group, send email to >>sara-list-unsubscribe@googlegroups.com >>For more options, visit this group at >>http://groups.google.com/group/sara-list?hl=en >-- >You received this message because you are subscribed to the Google >Groups "Society of Amateur Radio Astronomers" group. >To post to this group, send email to sara-list@googlegroups.com >To unsubscribe from this group, send email to >sara-list-unsubscribe@googlegroups.com >For more options, visit this group at >http://groups.google.com/group/sara-list?hl=en
On Wed, Nov 14, 2012 at 3:21 AM, David Ocame <doc...@sbcglobal.net> wrote:
> Den, I found that "AGC control" in these off the shelf products is
> sometimes very deceptive. They say AGC on/off, but what they mean is AGC
> fast/slow. Icom receivers are the worst offenders for this. It took 2 years
> and dozens of emails before a tech at Icom finally admitted this to me!
> Dave
> This message was NOT sent from my Blackberry
> ***********************************
> *****I'm not dead, yet!************
> ***********************************
> Dave Ocame, WS1ETI
> Stony Creek Observatory
> FN31og
> -72.834 longitude
> 41.272 latitude
> Member: The SETILeague, Inc. (Awards Chair),
> The Society for Amateur Radio Astronomy (SARA),
> The International Trumpet Guild, Shoreline Jazz Collective, and
> The Connecticut Symphonic Winds
> *From:* Den Koawl <dko...@gmail.com>
> *To:* sara-list@googlegroups.com
> *Sent:* Tuesday, November 13, 2012 11:37 PM
> *Subject:* Re: [SARA] Re: SDR IQ
> I see, well im not sure what software you are using with it, but i
> downloaded the SDRSharp pkg, and it has a tick box which disables
> AGC........ i cant remember the website now that i downloaded from but i
> can look for it again if this helps ?
> On Tue, Nov 13, 2012 at 5:29 AM, David L, N5OIQ <dmlon...@gmail.com>wrote:
> Den,
> I've got a RTLSDR dongle myself and they are good little radios with a
> large instantaneous bandwidth. It has been a while since I've played
> around with my RTLSDR and I could see that it has some issues with
> automatic gain control that couldn't be disabled. Perhaps someone here in
> the group would know if AGC can be disabled on these things?
> David
> On Monday, November 12, 2012 10:01:10 PM UTC-6, Den Koawl wrote:
> David Hi, and tnx for info...... i did take a look at the QS1R, but the
> price is a little high for me, at the moment. For the price, that thing
> should cover more spectrum ( i think ), so for now i have to settle for
> using the Realtech USB SDR device and the associated software for it. I may
> end up getting that QS1R someday or the RASDR when it is available.
> Tnx for info.
> 73
> Den
> On Mon, Nov 12, 2012 at 6:44 AM, David L, N5OIQ <dmlo...@gmail.com> wrote:
> On Saturday, November 10, 2012 7:24:16 PM UTC-6, Den Koawl wrote:
> Greetings All,
> Is anyone using using the RFSPACE SDR IQ for rcvr ? Im wondering how well
> it is working out ?
> Tnx
> Den
> --
> You received this message because you are subscribed to the Google
> Groups "Society of Amateur Radio Astronomers" group.
> To post to this group, send email to sara...@googlegroups.com
> To unsubscribe from this group, send email to
> sara-list-...@**googlegroups.com
> --
> You received this message because you are subscribed to the Google
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