The photomodel comes with a Voltage regulator. Supply was 9 V, 123 mA. The final Version also has an Attenuator at the output. For Fine Adjustement of the Level and Improvement of the Matching. BOM is approx. 123 CHF.

Motivated by the Version with 2 x GVA-81+ we wanted to continue towards the 'Ghetto Blaster'. Still, the Amplitude response is not too shabby.

Some theroretical max. ENR values (without attenuator) mayst be :

TYPE	NF [dB]	GAIN [dB]	ENR [dB]
GVA-81+	7.4	10	42.2
GVA-82+	6.6	13.8	47.4
GVA-83+	6.2	17.1	52.8

In order to calculate the ENR value from the Noise Floor Measurement, we used this website. The above ENR was measured with three identical Gain Blocks. The 50Ω Resistor produces a Noise of -113.1 dBm in a 300 kHz Bandwidth at 290 K.

With 3 x GALI-19+ and PAT-3 the ENR value is : 38.18 dB @ 1.0 GHz
And yes, we know that graphs end, where data becomes unflattering. Please believe me, I only have a FSP-3 from Rhode & Schwarz (3 GHz) High Precision Spectrum Analyzer 🙁

As some Tester will switch the Noise Source ON and OFF, the Output matching must be very good, in both cases. This can be accomplished by increasing the attenuator at the output to higher values. Using an attenuator of 15 dB, we can increase the matching by 30 dB. Yes, the ENR will drop by 15 dB. In terms of ENR, we measured the following values :

FREQUENCY [MHz]	ENR [dB]
500	24.86
1000	24.44
2000	23.59
3000	23.18

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