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Re: Can an RTL dongle be made to show correct frequency in the console on QO-100??
Chris Wilson
Hello jdow,
Tuesday, April 13, 2021 Glad you have such a good sense of humor, I long suspected under that "take no fools gladly" exterior there lay a fun lady :) You remain on my colour her posts orange list ;) Look after yourself Joanne! Best regards, Chris 2E0ILY mailto:chris@... j> It's Joanne or simply "Jolly Dirty Old Woman." (One might j> say I was born a DOW..... My mother had fun with that one for j> decades before I started to use it. The tradition lives on.) j> {^_-} j> On 20210413 14:17:15, Chris Wilson wrote: j> j> j> Hello Paul, j> Monday, April 12, 2021 j> Thanks for the kind words, I am not ashamed to ask about anything j> I do not have the knowledge to surely answer myself, no problem. j> In fairness to Jane (and I assume you're talking of jdow?), I have j> my e-mail package highlight all her posts in orange, and have been j> doing this for MANY years. She has taught me a great deal and I j> respect her knowledge, age and the fact she freely agrees she can j> be grumpy ;) So her abrasiveness is something I have come to find j> amusing and I willingly accept it for the info she imparts. In j> comparison to some other mentors I have come across, parental, at j> school, and in later life, she's a pussycat :) j> All the best Paul, take care. And you Jane ;) j> Best regards, j> Chris 2E0ILY mailto:chris@... pn>> pn>> pn>> pn>> pn>> Chris 2E0ILY pn>> pn>> I have enjoyed following your thread with Sigi on this subject. pn>> Please feel free to ignore James Hunt and ask other questions as they come up. pn>> It is how we all learn. pn>> pn>> pn>> Paul N2EME pn>> pn>> pn>> pn>> pn>> pn>> From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on pn>> behalf of jdow <jdow@...> pn>> Sent: Monday, April 12, 2021 5:53 PM pn>> To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> pn>> Subject: Re: [SDR-Radio] Can an RTL dongle be made to show pn>> correct frequency in the console on QO-100?? pn>> pn>> Study how a superheterodyne radio works. Then you can probably pn>> answer your own question and figure out why pn>> pn>> {o.o}. pn>> pn>> pn>> On 20210412 05:01:15, Chris Wilson wrote: pn>> pn>> pn>> Hello Siegfried, pn>> Monday, April 12, 2021 pn>> OK, it's working now. What I was expecting was after restarting pn>> the console with the new definition applied (and I had already pn>> enabled the 99.9 GHz option box) was it to restart on the closing pn>> frequency, but showing the correct scaling. When I did just what pn>> you said below, I see the satellite band, but I can also see it pn>> tuning back down around 739 MHz. Is that right Sigi? Thanks for the idiot proof instructions ;) pn>> Best regards, pn>> Chris 2E0ILY mailto:chris@... SJ>>> in radio definitions add the 9.75 gig downconverter SJ>>> in general settings change max frequency to 99.9 gig (another digit to SJ>>> display) SJ>>> now tune to 10.489 g SJ>>> done SJ>>> dg9bfc sigi SJ>>> ps stabilisation with psk beacon is another thing ... first get the base SJ>>> setup running SJ>>> Am 11.04.2021 um 23:51 schrieb Chris Wilson: pn>> pn>> pn>> pn>> I got my dish up this weekend and pointed at QO-100. It gives a pn>> good signal just using an RTL dongle for RX and alignment and pn>> testing. But it's now near 1.00 AM and I have to give up on pn>> getting the Console to show anything but around 740 MHz when pn>> listening to the satellite. I may well be being dense, but I now pn>> need to ask, is it indeed possible to make it show the real pn>> frequency? Nothing I have tried changes the displayed frequency at pn>> all. I am using a Bull's Eye LNB (LO 9750 MHz, output 739 to 1950 pn>> MHz). I made a definition showing down converting, frequency pn>> 9011MHz, for example, but nothing changes... Tried many other stabs at this. Thanks. pn>> pn>> pn>> pn>> pn>> pn>> pn>> j> j> j> j> |
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Re: Auto Start Two Instances with Different Identities
Kevin_E
Not needed, but I find when SDR-Console is minimized, the CPU takes less of a hit.
Kevin. |
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Noise Blanker Operation
Gedas
I am having console record SSB audio that appears at odd times on/off during the day so I enable recording and use the SSB squelch feature to limit the file size. The issue I am having is I get occasional brief pops that breaks the squelch open (at different times about once every 10 seconds or so). If I move the sensitivity slider to the right to squelch deeper I miss out on the weaker voice traffic all together. So I thought about using the noise blanker to limit those small millisecond pops that occur so that my squelch is not triggered. I am trying to figure out the threshold and width settings. Moving either one of them from one end to the other seems to have no affect on whether those very brief pops come through or not. Can someone tell me where those two sliders
should be set to limit brief "pop-ups"? Thanks Gedas, W8BYA EN70JT Gallery at http://w8bya.com (under repair) Light travels faster than sound.... This is why some people appear bright until you hear them speak. |
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Re: Low-co.st, software-definable front end preselector for SDRs
jdow
Oh, let's say it is somewhat difficult to get a SAW
filter that is very wide. Presuming more modern materials and
processes some significantly larger bandwidths may be feasible
when I was working with them. (My teacher in this regard went on
to become a chief engineer at Qualcomm reporting directly to the
company president. Chuck was one of the very few PhDs I've met who
were considered by all to be "lab safe".) The oscillator I mention
when discussing my "oscillators don't" aphorism was 100kHz wide at
around 300 MHz. It was "human size" for working with it. Size
reductions and lithography improvements probably move it up to
about 10 MHz wide at near 1,575.42 MHz. AND the GPS signal has
some 50 dB of anti-jam margin. And noise or weak signal is just
nature jamming the signal rather than enemy action. So, yeah, I
can see it working "OK" for you. 10 MHz wide is totally different
from 400 MHz wide at 500 or 600 MHz as far as letting in foreign
signals. That is not saying it is poor. It is just saying it
leaves a lot more room for interfering signals to get in. And I do
not know what is up there and a problem at which frequencies. So I
am wondering what a census of these regions of spectrum would show
me if I setup to take a critical look.
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(SAWs are cute gadgets. But for really narrow bandwidths they can get horridly large depending on material. But you CAN build some magical filters out of them. The design process is very much like designing FIR filters for SDRs.) {^_^} On 20210426 07:44:34, Roy VE7DH wrote:
You'll note that the SAW filter I mentioned is at 1550 Mhz, whereas GPS/Glonass, GNSS in general is at 1575 to 1600 Mhz. |
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Re: Low-co.st, software-definable front end preselector for SDRs
Roy VE7DH
You'll note that the SAW filter I mentioned is at 1550 Mhz, whereas GPS/Glonass, GNSS in general is at 1575 to 1600 Mhz.
So perhaps Saw filters are not really as narrow as they would pretend to be, though I do agree with your point about the octave wide filters. In general I would say that any filtering would be an improvement over no filtering; if the device in question is sufficient or desirable is yet to be determined. regards, Roy |
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Re: Auto Start Two Instances with Different Identities
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From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kevin_E
Sent: 26 April 2021 01:02 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Auto Start Two Instances with Different Identities
Thanks Simon, exactly what I was looking for. Although, at first I was trying with /min to start minimized and it would crash with the "please wait..." loading bar. On 3.0.21 anyways. -- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems. |
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Re: Low-cost, software-definable front end preselector for SDRs
Tom Crosbie G6PZZ
Have you got one of these Tracey? If so, any good? I’d really be looking for LF/MW anyway. Hope you are well Tom G6PZZ
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Tracey Gardner via groups.io
Sent: 26 April 2021 10:47 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Low-cost, software-definable front end preselector for SDRs
Well I did warn you :-)
73s Tracey G5VU
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Re: Low-cost, software-definable front end preselector for SDRs
michel soldevila
That one is simpler and much more affordable. Would you please give me some details about your setup ?
73 |
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Re: Low-cost, software-definable front end preselector for SDRs
Tracey Gardner
Well I did warn you :-)
73s Tracey G5VU
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Re: Low-cost, software-definable front end preselector for SDRs
michel soldevila
Ooops! Twice my SDR price !
Thanks anyway ! 73 de F1GOC |
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Re: Auto Start Two Instances with Different Identities
Kevin_E
Thanks Simon, exactly what I was looking for. Although, at first I was trying with /min to start minimized and it would crash with the "please wait..." loading bar. On 3.0.21 anyways.
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Re: Low-co.st, software-definable front end preselector for SDRs
Siegfried Jackstien
http://www.fukowa.de/9-band_preselektor.html ready touse or as a kit lcd controller, cat communication http://www.fukowa.de/KW%209-Band%20Preselector%20public%20version.pdf ... only hambands (not for the sw listener) but needs no tuning
but only selection with a relay dg9bfc sigi
Am 24.04.2021 um 15:30 schrieb Simon
Brown:
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Re: Low-co.st, software-definable front end preselector for SDRs
jdow
SAW filters are MUCH narrower than the nearly octave
band filters in this gadget.
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{o.o} On 20210425 06:36:20, Roy VE7DH wrote:
jdow, |
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Re: Low-co.st, software-definable front end preselector for SDRs
Siegfried Jackstien
not a big chip ... but a box with some relays ... a few coils and
a bunch of caps (plus an arduino or similar getting frequency via
cat command on comport or usb) 1 pf, 2 pf 4 .8. 16. 32.64 125 250 500 depending how dense you make the stepping in the coils you maybe can live with fewer caps greeetz sigi dg9bfc Am 24.04.2021 um 14:23 schrieb Lawrence
Stoskopf via groups.io:
Might be a really big chip! N0UU |
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Re: Low-co.st, software-definable front end preselector for SDRs
Roy VE7DH
jdow,
I have more than one GPS receiver/antenna in use here and when using HF or VHF transmissions it is not uncommon to lose the GPS signal over the transmission period. One way I have found to mitigate that somewhat is to add extra low pass filtering at the TX end specifically to reduce the received harmonics at the GPS frequencies. I have also used a 1550 Mhz LNB (Intelsat/Inmarsat) with internal SAW filter on a 1550 Mhz patch antenna to receive GPS signals. It works very well, both in received signal levels and also in resistance to the transmitters. So, I would think that the filters in question would be helpful under those conditions. regards, Roy |
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Re: panadapter RTL-SDR IC-756pro2
iz1fks
I'm using a RTL-SDR as panadapter on my ic-756p2.
I have found several anomalus behaviour with External radio mode: 1) zoom level rest each time frequency is changed by radio vfo, the zoom level should be competely independent. 2) RADIO=>SDR setting is not recognised, I'll expect that with this setting the frequency in SDR i stracked by the radio, but this happen only when SDR=>Radio is enabled. Tracking mode is not clear to understand. It looks like the only one mode is available now. 3) every time the sdr is stopped, the software need to be closed and opened agian, otherwise the setting of sdr in panadater mode is not recognised 4) moving the radio vfo refresh of the spectrum is not smooth, this happen only when track mode is enabled |
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Re: Low-cost, software-definable front end preselector for SDRs
DL2EBV
Look for the WaveStar preselector by HB9KOC.
Has 8 bandpassfilters from 0 to 30Mcs and may be connected to an ELAD S2. I made it work with SDR console by an Arduino. Ernst, DL2EBV |
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Re: Low-cost, software-definable front end preselector for SDRs
Tracey Gardner
How about the Heros Technology Preselectors, if your bank balance will stretch that far?
73s Tracey G5VU
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Re: Low-cost, software-definable front end preselector for SDRs
michel soldevila
A HF version would be very useful. Has anybody heard about that ?
73 de F1GOC |
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Re: Low-co.st, software-definable front end preselector for SDRs
Why not simply make an analogue preselector Tom? Twin gang 500pF tuning condenser, rotary switch, a few coils with a FET to handle the impedances. Keep the current consumption low, a few AA cells and an on-off switch. I have a couple like this. One uses three 1m loops for tuning coils (L, M and S) and the other a set of ferrite rods. You could keep it simple and feed it with a long wire tapped into the tuning coil. Metal box for screening etc Allan G3PIY From:
main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Tom Crosbie G6PZZ
Thanks Jon, I have the RSPdx but I’m looking for something to narrow the passband between RX and Ant and the ability to tune in between those frequencies, hoping to give a helping hand to wanted frequencies. Like old analogue preselectors. My main interest is in MW/SW BCB
Tom G6PZZ
From: main@SDR-Radio.groups.io
<main@SDR-Radio.groups.io> On Behalf Of Jon Hudson via groups.io
Sent: 24 April 2021 15:31 To: main@sdr-radio.groups.io Subject: Re: [SDR-Radio] Low-co.st, software-definable front end preselector for SDRs
Below 2MHz, the SDRplay RSPs have up to 12 such bands: https://www.sdrplay.com/resources/RSPdxDatasheet.pdf
The RSPdx example- see page 2.
Best regards, Jon
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