| ® |
Tel: +44 (0) 1629 581222 Fax: +44 (0) 1629 580070
|
|
AOR (UK) Ltd | |||
|
|||||
| Unit 9, Dimple Road Business Centre, Matlock, Derbyshire DE4 3JX, England Tel: +44 (0) 1629 581222 Fax: +44 (0) 1629 580070 |
AR-ONE TECHNICAL BULLETIN PAGE
Additional technical measurement of AR-ONE
Data supplied by AOR Japan 23 June 2004
| IP3 / NF / IF_OUT | |||||||
| AR-ONE | |||||||
| RX | SINAD | IM3 | IP3 | NF | 10.7MHz IF_OUT | ||
| Condition | (12dB) | (+50/+100KHz) | (BW=16KHz) | (RF=-50dBm) | |||
| UNIT | MHz | dB | dBm | dB | dBm | ||
| 19.9 | -110 | 86 | 18.0 | 10.0 | -44 | ||
| 40.5 | -117 | 81 | 4.5 | 11.0 | -35 | ||
| 109.5 | -118 | 80 | 2.0 | 4.0 | -32 | ||
| 479.9 | -115 | 82 | 7.0 | 6.0 | -36 | ||
| 999.5 | -114 | 81 | 6.5 | 7.0 | -33 | ||
| 1999.5 | -112 | 82 | 9.0 | 8.0 | -38 | ||
| 2699.5 | -113 | 85 | 14.5 | 9.0 | -36 | ||
| PLL LOCK TIME | RX 1MHz -> 3000MHz : | 22 mS | |||||
| RX 3000MHz -> 1MHZ : | 20 mS | ||||||
AR-ONE discriminator / detector output
The
FM detector (discriminator) output can be picked up on IC25, pin 10.
Want wider audio bandwidth...
The widest audio bandwidth is obtainable straight from the FM detector (IC25, pin 10). This will be at
quite a low level. If this is not suitable, a good point to take the audio from would be at the output of
the mode select IC (IC29, pin 3). At this point, all modes are present and the signal hasn't been
altered too much (passed through a 1uf cap). A level of up to 60mV peak to peak should be present
here.
If this isn't large enough, then the audio stage will have to be used in some way.
If the wide band audio is to be maintained, the next few stages are best avoided.
IC18 provides High Pass Filtering.
IC19 provides Low Pass Filtering.
IC20 provides De-emphasis.
A level of about 40mV is maintained through this chain.
It may possible to bypass this section completely by feeding the output from the mode select IC
(pin 3, IC29) to the input of the volume control IC (pin4, IC26) via a capacitor (1uf).
If this is done, any audio tailoring in the audio pre-amp and audio amp will still be present so a little
experimenting with the values around Q5 and IC36 may be necessary. Alternatively just bring out
the controlled audio output (IC26, pin6) to a suitable external amplifier.
A scan of the IF-AF PCB is available as an Acrobat PDF (350kb) - click here
The
AGC is fed from the anode of D2 on the IF unit.
This
probably isn't the best point to tap into the AGC voltage. It is probably easier
to pick it up where it feeds other ICs such as IC1 or IC2 (pin2 in both cases).
These
are both located on the upper side of the IF board. Both ICs are AD603 and
located adjacent to the two 10.7MA20 crystal filters.
Further UK workshop measurements
The AR-ONE operates from a nominal 12V DC supply. We have today made some bench measurements to address your queries, the receive mode is NFM with receive frequency of 145.2MHz and 8 OHM speaker load.
| AR-ONE | Lamp on | Lamp off |
| Switched off | 61mA | 61mA |
| Switched on with zero audio | 709mA | 690mA |
| Switched on with 3mW audio | 709mA | 691mA |
| Switched on with 60mW audio | 726mA | 707mA |
BLACK BOX (no front panel), the radio powers on at very low volume (0.05mW), current is 656mA
with receive frequency of 145.2MHz NFM.
The current consumption is a few mA higher in AM receive mode when compared to NFM. The
radio typically draws around 709mA @ 145MHz and 754mA @ 2.5GHz, so is receive mode and
frequency dependant.
The IF output is configurable between 10.7MHz (2nd IF) and 455kHz (3rd IF) via a menu, output is
stated as -20dBm via a BNC rear panel socket. The 10.7MHz selection provides a 10MHz
bandwidth (+/- 5MHz).
© Copyright AOR UK
LTD 1996 - 2005. All other trade marks and names acknowledged. E&OE
Tel: +44 (0) 1629 581222 Fax: +44 (0) 1629 580070
Send mail to webmaster@aoruk.com with questions or comments about this web
site only.
HOME PAGE PRICES