rx-baofenguv-5r.pdf

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Baofeng UV-5R receiver sensitivity measurements

PA3FYM, April 2012

Introduction

Many people consider the Baofeng UV-5R the successor of the suprisingly popular

UV-3R/UV-100 models. As far as I could ascertain at this moment of writing, Hans PD0AC [1] was the

first who published some results of actual measurements on his Baofeng UV-5R.

In a private communication with Hans I promised him to measure my Baofeng UV-5R.

In this contribution my results are presented.

Measurement conditions and procedure

The Baofeng UV-5R was put into 'dual watch mode', i.e. menu item 7 (TDR) was set to 'ON'.

Menu item 5 (W/N) was set to 'WIDE'. Selected VHF and UHF frequencies were 145.000 MHz, and

432.000 MHz respectively. A Rohde & Schwarz SMS2 (old, but still going strong ;-) signal generator

was used as RF-source. Calibrated output level accuracy of the R&S SMS2 is ± 1.5 dB, minimum

signal level is -137 dBm (0.03 μV). The Baofeng UV-5R was connected to the signal generator, and the

injected signal was varied with 1 dB steps.

The SMS2 has a tone generator, but I always to use the 'quieting' method to measure sensitivities of

FM-receivers. Quieting makes it very easy to tune FM-receivers because e.g. frontend coils can be

tweaked to minimum audio meter reading, assuming that the IF and discriminator are 'on frequency'.

Although being a topic of debate, in practice it appears that 20 dB quieting equals

12 dB SINAD [e.g. 2].

With an 'open receiver', i.e. squelch level was set to '0', I defined three states:

a) when I could hear a difference between 'no signal' and 'signal'

b) 10 dB quieting (meter reading is ~3/10 th of the noise level)

c) 20 dB quieting (meter reading is 1/10 th of the noise level)

For squelch levels 1 – 9 (menu item 0) the injected signal was increased with 1 dB steps until the

squelch opened within one second , and subsequently decreased until the squelch closed.

In table 1 (next page) the results of my measurements are presented.

@145 MHz 20 dB quieting was measured at -125 dBm (0.13 μV), while @432 MHz this value

amounts -131 dBm (0.06 μV). @432 MHz I reached the limits of my RF-generator.

The performance of squelch levels 1 – 7 @145 MHz measured equal, while @432 MHz squelch levels

increase with ~1dB steps.

Although I don't want to draw conclusions, I consider my Baofeng UV-5R receiver very sensitive.

I did not measure other parameters (like strong signal behaviour etc.), so how the UV-5R behaves with

an external antenna is perhaps for somebody else to find out?

145.000 MHz

432.000 MHz

note

SQuelch

level

SQ

open (dBm)

SQ

close (dBm)

SQ

open (dBm)

SQ

close (dBm)

0

-132

----

-136

----

± 1 dB

0

-129

----

-133

----

~10 dB quieting

0

-125

----

-131

----

~20 dB quieting

1

-130

-133

-135

-137

2

-130

-133

-134

-136

3

-130

-133

-134

-135

4

-130

-133

-133

-134

5

-130

-133

-132

-133

6

-130

-133

-131

-132

7

-130

-133

-130

-131

8

-129

-132

-129

-130

9

-129

-130

-128

-129

Table 1. Baofeng UV-5R receiver sensitivity measurements by PA3FYM

Addendum:

The RF-output of my UV-5R was measured with a HP-432A power meter in conjunction with

calibrated attenuators. Battery status: 'fully charged' (i.e. green led on the charger).

Menu item 2 (TXP) 'HIGH'

'LOW'

145 MHz:

3.4W ± 50mW

0.85W ± 50mW

432 MHz:

3.6W ± 50mW

0.90W ± 50mW

Hans [1] asked me to measure the frequency accurary of my Baofeng UV-5R too, because some people

claim the UV-5R being 'off frequency'. I assumed that the transmit frequency is an indicator for the

PLL accuracy for both RX and TX, as I did not open the UV-5R to measure the local oscillator

frequency itself. Measurements with a HP-5326A (yes, nixie tubes! ;-) and a homebrew prescaler, in

conjunction with a calibrated rubidium standard as time base, revealed the following results

(sample time: 10 sec, accuracy 10 Hz):

UV-5R display

frequency

145.000 (MHz)

145.000.040 MHz (+ 40 Hz)

432.000 (MHz)

431.999.930 MHz

(- 70 Hz)

My UV-5R frequency accurary @145 and 432 MHz is (far) better than 0.5 ppm, which is very good.

References

[1] http://hamgear.wordpress.com

[2] http://www.repeater-builder.com/measuring-sensitivity/measuring-sensitivity.html

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Plik z chomika:

Inne pliki z tego folderu:

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Baofeng UV5R Short Cut.pdf (223 KB)
tg-uv2 serial interface schematic(1).jpg (102 KB)
usb cable end(1).jpg (483 KB)
shema-baofeng-5r(1).pdf (1736 KB)

Inne foldery tego chomika:

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