Re: [Hackrf-dev] Max TX power

2018-05-31 Thread Geoffrey Feldman 
Why not get an FM Broadcast transmitter? (assuming you have the appropriate 
license)Have you considered the antenna you would need to do whatever it is 
you are thinking about?   If you want to be a pirate, you could probably build 
an FM broadcast transmitter for less than the price of a HACK RF.   That way, 
when it is confiscated (or worse depending on where you live) you will lose 
less money.

 

Geoff

 

From: HackRF-dev [mailto:hackrf-dev-boun...@greatscottgadgets.com] On Behalf Of 
Mitja kocjancic
Sent: Thursday, May 31, 2018 2:20 PM
To: Chuck McManis
Cc: hackrf-dev
Subject: Re: [Hackrf-dev] Max TX power

 

can someone recomend a chep 1 to 100watts amp and filter (preferebly all in 
one) for FM Broadcast Band (also covering 64 to 76Mhz)

 

2018-05-31 17:23 GMT+02:00 Chuck McManis :

Have you considered a separate power amplifier ? While the HackRF can transmit 
a few milliwatts of power if you're actually going to use it to transmit 
something "for real" (rather than just use it for experiments) you might 
consider getting a filter for the band of interest and a separate power 
amplifier. That does two things for you, first it prevents the transmissions of 
spurious signals (harmonics, overtones, etc) that arise from the nature of how 
the signal is created. Second it lets you accurately control the effective 
radiated power of your antenna and power amplifier set up and stay within any 
transmission restrictions for the spectrum on which you are transmitting. As a 
bonus it protects the output stage of your HackRF from reflected transmission 
signals coming from mismatched transmission lines.

 

On Thu, May 31, 2018 at 1:35 AM, Matteo Terzi  wrote:

Hi all,

how can I set the maximum TX power of the HackRF?

On gnu radio I'm using a "multiply const=6" and the parameter "IF Gain=47" (of 
the osmocom sink). Any other method or strategies??

Thanks

 

Matteo

 

-- 

Matteo TERZI

Google Gmail Member

 

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Re: [Hackrf-dev] Max TX power

2018-05-31 Thread Chuck McManis 
Have you considered a separate power amplifier ? While the HackRF can
transmit a few milliwatts of power if you're actually going to use it to
transmit something "for real" (rather than just use it for experiments) you
might consider getting a filter for the band of interest and a separate
power amplifier. That does two things for you, first it prevents the
transmissions of spurious signals (harmonics, overtones, etc) that arise
from the nature of how the signal is created. Second it lets you accurately
control the effective radiated power of your antenna and power amplifier
set up and stay within any transmission restrictions for the spectrum on
which you are transmitting. As a bonus it protects the output stage of your
HackRF from reflected transmission signals coming from mismatched
transmission lines.

On Thu, May 31, 2018 at 1:35 AM, Matteo Terzi 
wrote:

> Hi all,
> how can I set the maximum TX power of the HackRF?
> On gnu radio I'm using a "multiply const=6" and the parameter "IF Gain=47"
> (of the osmocom sink). Any other method or strategies??
> Thanks
>
> Matteo
>
> --
> Matteo TERZI
> Google Gmail Member
>
> ___
> HackRF-dev mailing list
> HackRF-dev@greatscottgadgets.com
> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>
>
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