Re: [Hackrf-dev] Filter questions

[Chuck McManis]

FWIW, minicircuits is a pretty common place to go for filters, lnas, etc.
You can get a well characterized unit and be confident it will work the way
you expect. If you have enough RF gear to characterize stuff then you can
find things on tindie and AliExpress which are cost effective. But
consistency and quality can be highly variable.

On Thu, Apr 26, 2018, 9:46 AM Dominic Spill  wrote:

> On 26 April 2018 at 07:50, Brian Gieryk  wrote:
> >
> > What design programs or suppliers are folks using for RF filtering,
> external to the HackRF?
> >
> > Looking for band pass specifically, multi band, electronically
> switchable and capable of TX (HackRF output power level only).
> >
> > Thanks in advance for any and all ideas and direction!
>
> I'm sure others will have more useful suggestions, especially if you're
> planning to design your own, but I wanted to mention that I've had some
> success with filters from Mini Circuits -
> https://www.minicircuits.com/WebStore/Filters.html
>
> My experience/knowledge tends to end as soon as we hit the analog domain,
> so I have no idea how they perform compared to other suppliers or if they
> offer products for your more complex requirements.
>
> Thanks,
>   Dominic
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Re: [Hackrf-dev] Filter questions

[Brian Gieryk]

Thank you for that lead, Dominic.

My expertise (such as it is) ends at the ADC, haha.

Analog is my bread and butter, so to speak.

Brian
KE6IYC 

Sent from my iPhone

> On Apr 26, 2018, at 10:45, Dominic Spill  wrote:
> 
> On 26 April 2018 at 07:50, Brian Gieryk  wrote:
> >
> > What design programs or suppliers are folks using for RF filtering, 
> > external to the HackRF?
> >
> > Looking for band pass specifically, multi band, electronically switchable 
> > and capable of TX (HackRF output power level only).
> >
> > Thanks in advance for any and all ideas and direction!
> 
> I'm sure others will have more useful suggestions, especially if you're 
> planning to design your own, but I wanted to mention that I've had some 
> success with filters from Mini Circuits - 
> https://www.minicircuits.com/WebStore/Filters.html
> 
> My experience/knowledge tends to end as soon as we hit the analog domain, so 
> I have no idea how they perform compared to other suppliers or if they offer 
> products for your more complex requirements.
> 
> Thanks,
>   Dominic
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Re: [Hackrf-dev] Filter questions

[Dominic Spill]

On 26 April 2018 at 07:50, Brian Gieryk  wrote:
>
> What design programs or suppliers are folks using for RF filtering,
external to the HackRF?
>
> Looking for band pass specifically, multi band, electronically switchable
and capable of TX (HackRF output power level only).
>
> Thanks in advance for any and all ideas and direction!

I'm sure others will have more useful suggestions, especially if you're
planning to design your own, but I wanted to mention that I've had some
success with filters from Mini Circuits -
https://www.minicircuits.com/WebStore/Filters.html

My experience/knowledge tends to end as soon as we hit the analog domain,
so I have no idea how they perform compared to other suppliers or if they
offer products for your more complex requirements.

Thanks,
  Dominic
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[Hackrf-dev] Filter questions

[Brian Gieryk]

Good morning.

What design programs or suppliers are folks using for RF filtering, external to 
the HackRF?

Looking for band pass specifically, multi band, electronically switchable and 
capable of TX (HackRF output power level only).

Thanks in advance for any and all ideas and direction!

Brian
KE6IYC

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Re: [Hackrf-dev] HackRF and Spyverter

[web]

Hi,

Yes you possibly will damage the spyverter. Though it does have a fairly high 
level of input attenuation above 65Mhz so it might survive but it certainly 
won’t do what you are wanting. 

 It is intended to shift a very small level signal up 120Mhz. 

A better course of action would be an amplifier designed to operate at 918Mhz 
to amplify (and filter) the out put of the hack RF up to the desired level.

Bernie

> On 26 Apr 2018, at 16:03, Mitja kocjančič  wrote:
> 
> anyone knows if Spyverter can be used in oposite direction (to transmit a 
> signal on 120,918Mhz and have it output on 918khz) because HackRF is realy 
> weak on theese low frequencies so if it could put a solid 15dbm below 10Mhz 
> it would be great
> but I am afraid to damage my Spyverter if I try this
> PS: Can I uses bias tee from HackRF to power my Spyverter?
> 
> 2018-04-25 23:08 GMT+02:00 Gavin Jacobs  >:

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Re: [Hackrf-dev] Auto-calibration in receiving mode

[Matteo Terzi]

Hi Dominic,

You have been clear.
So, to summarise, I have to analyze the signal with the maximum sample rate
(20MHz), to include the right value in the graphic and then with the
buttons "db/Div" and "Ref level" I must zoom on what I'm interested in.
Do you know a block that functions in this way?
Give me a feedback.
Thanks a lot

Matteo

2018-04-24 17:37 GMT+02:00 Dominic Spill :

> Hi Matteo,
>
> I think I understand what you're looking for.  You want to transmit a
> signal, e.g. keyfob, and have the HackRF automatically show you the
> frequency that it's transmitting on.
>
> You could use HackRF in a spectrum analyzer mode, such as hackrf_sweep, to
> see where the transmission is and then manually zoom in to it, but having
> the software do that automatically is more complicated because there's no
> way to know which signal you are hoping to focus on.
>
> Does that answer your question?
>
> Dominic
>
> On 24 April 2018 at 03:03, Matteo Terzi  wrote:
>
>> ​Hi Dominic,
>> What I'm trying to do is:
>> ​- I want to acquire a signal from a general device ( garage door opener
>> remote control, rf car's key etc). So I don't know the real value of the
>> signal (2Hz or 40GHz). Is the hackrf able to set itself on the right value
>> of frequency and let me know the result by means of a graphic. I wanna use
>> it as a sniffer/reader of frequencies.
>>
>> Thanks for the support
>> Matteo
>>
>>
>> 2018-04-24 0:20 GMT+02:00 Dominic Spill :
>>
>>> Hi Matteo,
>>>
>>> I'm not sure I understand the question.  What are you trying to
>>> achieve?  Is there a known signal and you want to automatically find it?
>>> Something like GSM and you want to know which frequency the local towers
>>> are using?
>>>
>>> Or is it something else?
>>>
>>> Thanks,
>>>   Dominic
>>>
>>> On 17 April 2018 at 08:03, Matteo Terzi 
>>> wrote:
>>>
 Hi all,
 I'd like to know if there is a way to create a program, with GNU Radio
 Companion, which can acquire an unknown signal and display it on a FFT
 Sink, which should auto-calibrate on the right value of the signal.
 To explain better:
 I want to acquire a signal, but I don't know its value (Hz); so I need
 a FFT Sink that can do an auto-calibration, according to the value of the
 signal, to show me what the hackrf is acquiring, without having the issue
 to set the sample rate of the FFT Sink to an huge value to cover all the
 frequencies (difficult to visualize).
 Thanks for the support

 Matteo
 --
 Matteo TERZI
 Google Gmail Member

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>>>
>>
>>
>> --
>> Matteo TERZI
>> Google Gmail Member
>>
>
>


-- 
Matteo TERZI
Google Gmail Member
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Re: [Hackrf-dev] HackRF and Spyverter

[Mitja kocjančič]

anyone knows if Spyverter can be used in oposite direction (to transmit a
signal on 120,918Mhz and have it output on 918khz) because HackRF is realy
weak on theese low frequencies so if it could put a solid 15dbm below 10Mhz
it would be great
but I am afraid to damage my Spyverter if I try this
PS: Can I uses bias tee from HackRF to power my Spyverter?

2018-04-25 23:08 GMT+02:00 Gavin Jacobs :

> Alejandro,
> The Spyverter will shift the 457kHz signal up by 120 MHz, so the result
> will be 120.457 MHz. Connect your 457kHz signal to the input of the
> Spyverter; connect the output of the Spyverter to the rf input of the
> hackrf. Remember to apply 5Vdc to the Spyverter (make sure you use a linear
> power supply, or a battery pack, because a switch mode supply will be very
> noisy). You can use gnuradio companion (or numerous other programs) to show
> the spectrum.
>
> Jake
>
> --
> *From:* HackRF-dev  on behalf
> of ALEJANDRO RAMIRO MUNOZ <100314...@alumnos.uc3m.es>
> *Sent:* April 25, 2018 2:36 PM
> *To:* hackrf-dev@greatscottgadgets.com
> *Subject:* [Hackrf-dev] HackRF and Spyverter
>
> Hey all!
>
> I'm writing this e-mail because I'm using HackRF-One SDR as a spectrum
> analyzer in a university project.
>
> I'm also using a Spyverter converter (https://airspy.com/spyverter-r2/)
> and I'm having troubles to configure correctly the device, since I'm not
> very familiar with it.
>
> I'm interested in detecting with the HackRF-One a signal which is at 457
> KHz (out off the range of operation), therefore I need the Spyverter to
> achieve it, but I'm not able to configure it.
>
> If you have some experience with this device used with a HackRF, or
> there's any website I can get some information about how to configurate it,
> I'll apreciate it a lot.
>
> Thank you very much in advance,
> Kindest regards,
>
> Alejandro Ramiro.
> --
> Alejandro Ramiro Muñoz
> NIA: 100314975
>
> Grado en Ingeniería de Sistemas de Comunicaciones
> *(Bachelor's Degree in Communication System Engineering)*
>
> *Universidad Carlos III de Madrid*
>
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