I bought a clone in the FE of the HackRF One with Portapack H2. Reason: It can receive and send up to 6GHz.

I have a lot of experience with the SDRPlay1a, so I can compare. Well, the difference is of course the fact that it can also do TX. And the SDRPlay can only RX.

Well, how much power can it send then ???

Quick measurement with a Marconi freq generator (2030) up to 1.35 GHz as adjusting device.

Software to drive the HackRF is  SDRangel 1.4.1 with an NFM modulator configured.

Spectrum analyser is the Hameg 5006.

1MHz     +4   dBm

2MHz     +7   dBm

3MHz     +10 dBm

5MHz     +10 dBm

10MHz   +14 dBm

20MHz   +14 dBm

30MHz   +14 dBm

50MHz   +11 dBm

100MHz +8   dBm

300MHz +4   dBm

500MHz +5   dBm

550MHz +2   dBm

ok, there is some cabling, a few connectors, and a 10dB attenuator in the line, which are definitely not 100% reliable on the higher frequencies. So I am not disappointed, but I cant measure above 550MHz because I don't have the equipment for this.

 

Harmonics ??

At 3.65 MHz the harmonics are -30dB, -45dB and -54dB down, the rest is lower than -70 dB under the 3.65MHz.

IFFFF the max power setting is 38dB + the RF Amp MAX. If you set more power, the main signal is not going up, but the harmonics

go sky hi !!! 10's of dB's higher.

At 7.1 MHz the harmonics are -30, -40 and -42 dB at also 38dB + Amp.

At 14.175 MHz -30, -44 and -52dB same power setting

At 29 MHz -30, -48, -56dBm same power setting

At 70 MHz -35, -50, <-60dBm

 

Conclusion is that the harmonics are not within the regulations but are -30 and lower. It needs a low pass filter that attenuates -20 or even better -30 dB. Good to know !

 

At higher frequencies the problem is less.

At 145MHz I could set the power at 47dB + RF Amp ticked on, and the harmonics were -30dB, -46 dB and < 60dB. Good news.

 

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