Re: Observing a low frequency signal using an up converter
That's a good tip Bob, the next prob;em is to get a suitable antenna, i have had success with a pa0rdk "miniwhip antenna" here is a link;
https://www.youtube.com/watch?v=ewgPLeKOyCU
It receives
By
THE BOSS
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#8857
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Re: Another Possible bug in Big Digit Freq FW
Thanks,? I never knew the jog wheel had multiple functions.
I guess I need to figure out how I changed the function accidentally
Rich
By
K3RWN
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#8856
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Re: Noise Sources
As do I! ?Not only that, I could afford the textbooks.
larry
By
Lawrance A. Schneider
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#8855
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Re: Observing a low frequency signal using an up converter
Thanks John.
Appreciate the reply.
A search for "BG7TBL" returned a lot of stuff on 10MHz sources.
I will have another look around using the "SA LF Converter" search terms.
Cheers...Bob VK2ZRE
By
Bob Ecclestone
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#8854
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Re: Observing a low frequency signal using an up converter
Hi Bob,
I bought it in 2018 or 19 from a vendor on Ali Express and the vendor was according to my notes Ham Radio Shop. Great to deal with, but of course that was nearly 4 years ago and thus who knows
By
John Cunliffe W7ZQ
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#8853
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Re: Which branch to use to compile the same firmware as Erik is releasing?
Lane,
That's correct, but also these lines are not needed anymore:
Martin
By
Ho-Ro
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#8852
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Re: Another Possible bug in Big Digit Freq FW
The jog wheel can move start, stop, center freq or markers.
Look at the small triangle in front of the start/stop/center freq or marker and you know what is selected and can be changed by the jog
By
Erik Kaashoek
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#8851
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Re: tinySA branch 'V4.3' renamed to 'main'
Lane,
It shall be
$ git describe --tags
because the v1.4 is only a lightweight tag, which is just a kind of comment, while the v1.2 and also the (fixed) v1.3 were annotated tags. Yes, the
By
Ho-Ro
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#8850
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Re: Another Possible bug in Big Digit Freq FW
I turned off the unit and when I turned it back on everything was working as expected.?? I have no idea why the jog wheel was changing the Start freq.
Sorry for the false alarm
Rich
By
K3RWN
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#8849
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Re: Observing a low frequency signal using an up converter
Hi John,
Can you recommend the "brand" of Up Converter you have and a reliable supplier please.
As you say, there are a plethora of clones out there. I would rather get "The Real McCoy".
TIA...Bob
By
Bob Ecclestone
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#8848
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Another Possible bug in Big Digit Freq FW
Using the new FW when I use the jog wheel to move a marker.?? The jog wheel changes the Start freq by the setting of the Scale/Div.?? In my case 2 mhz.?? Prior to this FW the marker could be
By
K3RWN
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#8847
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Re: tinySA branch 'V4.3' renamed to 'main'
Martin, do we still need to do the "dirty fix" in removed and added a tag for work on V1.4 ?
I am seeing this on my newly created main (v1.4??)
$ git describe
v1.2-666-g504486d
I actually slowly
By
Lane Wilson
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#8846
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Re: Which branch to use to compile the same firmware as Erik is releasing?
Martin, to make sure I have this correct, the changes to my previous instructions are:
remove the line--> git checkout V4.3
remove the lines below for the temporary fix for wrong version number (do
By
Lane Wilson
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#8845
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Re: Observing a low frequency signal using an up converter
Hi Ken,
not the double balanced ones. They have mostly transformers on the LO and RF port.
And I prefer this mixers because of the higher dynamic.
Isidro
DB1SBI
?BlueMail for Android
By
Isidro Berniol
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#8844
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Re: Observing a low frequency signal using an up converter
Isidro,
I am using a pre made unit I bought 2018 or 19. It has a SBL-1 mixer terminated with 3db attenuators, a few band pass filters a limiting circuit and a couple of MMICs. It works well enough
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John Cunliffe W7ZQ
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#8843
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Re: It is fun to be stupid!
I would have tried the procedure a 24th time ............... just to be sure.
By
Rebel Thompson
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#8842
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Re: Observing a low frequency signal using an up converter
Hello Isidro,
What you say about using the normal IF port as input is true for the
minicircuits mixers such as the SBL1. But there are many other mixers
that can work right down to DC. Especially many
By
Kenneth Greenough
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#8841
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Re: Observing a low frequency signal using an up converter
Hello Larry,
It's an unfortunate fact that most times you already need to have accurate
test gear to check anything else.
73 Ken g8beq
By
Kenneth Greenough
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#8840
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Re: Observing a low frequency signal using an up converter
Hello John,
I realise that my description was very basic and could benefit from filters, amplifiers etc.
For anyone wanting to just look at audio frequencies the oscillator could be on 10.7 MHz
and
By
Kenneth Greenough
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#8839
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Re: Observing a low frequency signal using an up converter
To find the perfect LO level for this application use the IF input of the mixer with a signal at the level limit of the mixer. Then apply the LO signal at the nominal level.
Now variate the input in
By
Isidro Berniol
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#8838
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