3-249-146-21(1)

Notes on Headphones

Road safety Do not use headphones while driving, cycling, or operating any motorized vehicle. It may create a traffic hazard and is illegal in many areas. It can also be potentially dangerous to play your headphones at high volume while walking, especially at pedestrian crossings. You should exercise extreme caution or discontinue use in potentially hazardous situations. Preventing hearing damage Avoid using headphones at high volume. Hearing experts advise against continuous, loud and extended play. If you experience a ringing in your ears, reduce volume or discontinue use. Caring for others Keep the volume at a moderate level. This will allow you to hear outside sounds and to be considerate to people around you.
TV/WEATHER/FM Stereo/AM PLL Synthesized Radio

Operating Instructions

Battery Life (Approx. hours) When using TV Sony alkaline 31 size AAA (LR 03) Sony size AAA (R03) 12

WEATHER 31 12

FM 34 13

(JEITA*) AM 54 24

To attach the battery compartment lid if it is accidentally detached (See Fig. A )
The battery compartment lid is designed to come off when opened with excessive force. To put it back on, see the illustration.
* Measured by JEITA (Japan Electronics and Information Technology Industries Association) standards. The actual battery life may vary depending on the circumstance of the unit. When to replace the battery You can check the remaining battery power that appears in the display. The indicators are as follows: Indicator Full strength*
1 Insert one side of the lid as illustrated. 2 Push the other side to attach.
WALKMAN is a registered trademark of Sony Corporation to represent is a registered trademark of Sony Headphone Stereo products. Corporation.
Insert the # side of the battery first.

TV/WEATHER/FM/AM WALKMAN

SRF-M37V
Sony Corporation 2003 Printed in China
Weakening* When the battery becomes exhausted, the unit will turn off. Replace with new battery. When you press POWER after installing the new battery, the indicator changes to .

Warning

If there is lightning when you are using the unit, take off the headphones immediately.
If you have any questions or problems concerning your unit, please consult your nearest Sony dealer.
For customers in the USA Please register this product on line at http://www.sony.com/productregistration. Proper registration will enable us to send you periodic mailings about new products, services, and other important announcements. Registering your product will also allow us to contact you in the unlikely event that the product needs adjustment or modification. Thank you.
* Displayed only when the radio is turned on. Note Do not take more than 3 minutes to replace the battery, otherwise, your clock settings and preset stations will be initialized. Should that happen, reset the functions again. Notes on battery Do not charge the dry battery. Do not carry the dry battery together with coins or other metallic objects. It can generate heat if the positive and negative terminals of the battery are accidentally come into contact with metallic objects. When you are not going to use the unit for a long time, remove the battery to avoid damage from battery leakage and corrosion.

Size AAA (R03) x 1

Troubleshooting
Should any problem persist after you have made the following checks, consult your nearest Sony dealer. All buttons do not operate at all. - is displayed. Slide the HOLD switch so that - disappears. Very weak or interrupted sound, or unsatisfactory reception Weak battery. In a vehicle or in a building, move closer to a window. Display is dim, or no indication is displayed. Weak battery. The unit is being used in extremely high or low temperatures or in a place with excessive moisture. The station cannot be received when a PRESET TUNING (1 to 5) button is pressed. You chose the wrong preset number. The memory of the station has been initialized. Preset the station again. The power cannot be turned on, and is flashing in the display. The battery have been completely exhausted. The preset stations may be initialized, if a maintenance service is performed. Please note down your settings in case you want to preset them again.

WARNING

You are cautioned that any changes or modifications not expressly approved in this manual could void your authority to operate this equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Trade Name: Model name: SONY SRF-M37V

Tested To Comply With FCC Standards FOR HOME OR OFFICE USE If you have any questions about this product, you may call: Sony Direct Response Center 1-(800)-222-7669 or write to: Sony Direct Response Center 12451 Gateway Blvd. Fort Myers, FL 33913 Declaration of Conformity SONY SRF-M37V Sony Electronics Inc. 680 Kinderkamack Road, Oradell, NJ 07649 USA Telephone Number: 201-930-6972 Trade Name: Model: Responsible Party: Address: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Specifications

Time display: 12-hour system Frequency range Band TV WEATHER FM AM Range 2 - 13 ch 1 - 7 ch 87.MHz 710 kHz Channel step 1 channel 1 channel 0.1 MHz 10 kHz

Before You Begin

Thank you for choosing the Sony radio! It will give you many hours of reliable service and listening pleasure. Before operating the radio, please read these instructions thoroughly and retain them for future reference.

Features

TV/WEATHER/FM/AM 4 band PLL (phase locked loop) synthesized radio. Easy Preset Digital Tuning with 25 memory presets. 5 direct presets calls and 1 direct weather-band button. Ergonomic Design for belt-holder use. Notes on AM Channel Step The AM channel step differs depending on areas. See Changing AM Channel Step.
Output i (headphones) jack ( 3.5 mm, stereo minijack) load impedance 24 Power output 2.8 mW + 2.8 mW (at 10 % harmonic distortion) Power requirements 1.5 V DC, one size AAA (R03) battery Dimensions Approx. 32 mm (w/h/d) (3 3/1/5/16 inches) incl. projecting parts and controls Approx. 25 mm (w/h/d) (3 3/1/inches) not incl. projecting parts and controls Mass Approx. 94 g (3.32 oz.) incl. battery and belt clip. Accessories Supplied Stereo headphones (1) Belt Clip (1) Design and specifications are subject to change without notice.

Installing the Battery

(See Fig. A )
1 Open the battery compartment lid and install one size AAA (R03) battery (not supplied) with correct polarity. When battery is first installed, AM 12:00 flashes in the display. Once the current time is set, the flashing stops. 2 Close the lid.

Precautions

Operate the unit only on 1.5 V DC with one size AAA (R03) battery. Avoid exposure to temperature extremes, direct sunlight, moisture, sand, dust or mechanical shock. Never leave the unit in a car parked under the sun. Should any solid object or liquid fall into the unit, remove the battery and have the unit checked by qualified personnel before operating it any further. In vehicles or buildings, radio reception may be difficult or noisy. Try listening near a window. To clean the casing, use a soft cloth dampened with a mild detergent solution.

Preventing Accidental Change
2 Press the preset tuning 1 to 5 button you wish to preset for

more than a few seconds.

You will hear two confirmation beeps and preset number appears in the display. To preset another station, repeat these steps. To change the preset station, tune in to the desired station and hold down the preset tuning 1 to 5 button. The new station will replace the previous station on the preset button. Example: Display window when you preset FM 90.0 MHz in the preset tuning 2 button for FM2.

yy ;; yy ;; y ;

VOL* POWER Belt clip HOLD CLOCK i (headphones) jack TUNE/TIME SET* WB TV/WB/FM SENS DX LOCAL PRESET TUNING 1-5* BAND

HOLD Function

Slide HOLD in the direction of the arrow. - is displayed, indicating that all the function buttons are locked. To cancel HOLD, slide HOLD in the opposite direction of the arrow so that - disappears.

Setting the Clock

The display will flash AM 12:00 when the battery is first inserted.
1 Hold down CLOCK for more than 2 seconds.
The beep sounds and the hour flashes in the display.
2 Press TUNE/TIME SET + or until the correct hour appears in

the display.

Each press changes the digit(s) by one. When you keep the button pressed, the digit(s) change rapidly. The beep sounds and the minute starts to flash. Repeat step 2 to set the minute. After setting the minute, press CLOCK again. The two beeps sound and the clock starts from 0 seconds. 12-hour system: AM 12:00 = midnight PM 12:00 = noon
Tuning in a Preset Station 1 Press POWER. 2 Press BAND or WB to select the band. 3 Press the desired preset tuning button. 4 Adjust the volume using VOL.
Note Holding down the desired preset tuning button for more than a few seconds will replace the previous station on the preset tuning button with the station you tuned in to.

3 Press CLOCK.

Using the Belt Clip

(See Fig. C)

* There is a tactile dot on/beside Vol, TUNE/TIME SET +, and the number 2 button.

Changing AM Channel Step

The AM channel step differs depending on areas. The channel step of this unit is factory-set to 10 kHz. Change the settings as shown below to be able to listen to the radio. Area North and South American countries Other countries Channel step 10kHz 9kHz
Use the belt clip when attaching the unit to your belt. To detach the belt clip, see fig. C-. To attach the belt clip, see fig. C-.
Note When the AM channel step is changed, the preset stations for AM will be initialized.
1 Press POWER to turn off the power. 2 While holding down CLOCK, keep pressing POWER for more

than 5 seconds.

Two short beeps sound, and the AM channel step will be changed. AM 9 (or AM 10) is displayed for about 2 seconds. If you proceed to step 2 again, the channel step changes again.

Improving the Reception

TV/WEATHER/FM: Extend the headphones cord which functions as the TV/ WEATHER/FM antenna (See Fig. B- ). AM: Rotate the unit horizontally for optimum reception. A ferrite bar antenna is built-in the unit (See Fig.B- ).
Set TV/WB/FM SENS to LOCAL if interference is prevalent and reception is too strong. Under normal conditions, set it to DX.

Playing the Radio

Manual Tuning 1 Connect the headphones to the i (headphones) jack. 2 Press POWER to turn on the radio. 3 Press BAND to select the band.
Each press changes the band as follows:

To detach

To change the band to WEATHER, press WB. You can return to the previous frequency by pressing BAND. FM1 and FM2 are differentiated only for Preset tuning. For Manual tuning of FM stations, select either band.
4 Press TUNE/TIME SET + or to tune in to the desired station. 5 Adjust the volume using VOL.
To turn off the radio, press POWER. Two short beeps sound when the minimum frequency of each band is received during tuning.
Each band memorizes the frequency you had tuned previously.

To attach

Presetting Your Favorite Station

Preset Tuning

You can preset up to 10 stations in FM (5 stations in FM1, 5 stations in FM2), and 5 stations in each AM, TV, WEATHER.

Presetting a station 1 Follow steps 1 to 4 in Playing the Radio and manually tune
in to the station you wish to preset.

Audio Phasing Kevin Schanilec
Background For MW DXing, a new tool that may be effective at reducing or eliminating on-channel stations you dont want to hear is audio phasing. I re-discovered this technique recently after buying my second Sony SRF-59 receiver. The SRF-59 is a surprisingly sensitive and selective DX machine in its own right, and the fact that it is so small and inexpensive ($15-20) makes it even more remarkable. This great receiver is fully reviewed by Gary DeBock at http://www.dxer.ca/content/view/55/78/. Having two of them got me thinking about experiments I did as a teen in the 1970's with stereo audio sources. While rewiring a pair of headphones one night, I accidentally forgot to reconnect the common (negative) lead to the two speakers, meaning that only the respective positive leads were connected. This resulted in the following circuit: The result was a bizarre-sounding version of the music I was listening to, in which the lead vocals, bass and drums were absent, whereas all of the other instruments were still heard.
Receiver Output LEFT COMMON RIGHT
What makes this possible is that, when music is mastered, material (+) (-) (-) (+) common to both channels is EXACTLY the same on both Left speaker Right speaker channels. When hooked up like this, the common material EXACTLY cancels out. Electrically, anything common to both channels (i.e., lead vocals, etc.) has the same voltage both positive speaker terminals, and so cancel each other out across the voice coil. It is only audio that is NOT common to both channels that creates a differential voltage across the voice coils so that you actually hear it. It got me thinking: if I had two DX audio sources, one that had only a dominant pest (i.e., point the antenna at a strong local and null the desired DX target) and one that had both the pest and the DX target, in essence I would have a pseudo-stereo source. By using the audio phasing technique described above, I should be able to make the pest disappear by injecting just enough of the first signal (pure pest) onto the second signal so that the pest just disappears, leaving the DX target. I had tried this with two different DX receivers a few months ago, but met with limited success, since the two receivers had slightly different filtering, bass/treble emphases, etc., which meant that virtually nothing in the two audio signals matched up. As a result, almost nothing was cancelled out. Enter the SRF-59! Since they are identical receivers, the audio from one set to another should be the same when tuned to a given station. With two of them in hand, I decided to give the experiment another try.
Making The Connections I sacrificed an audio patch cable in order to effect the circuit described above. Specifically, the audio leads from the two receivers headphone jacks consist of a 1/8 mini stereo male-male audio cable cut in half, with all 3 wires bared on each half. You will also need some way to connect up with your destination, such as a speaker, headphones, recorder, etc. I had a female end of an old 1/8 mini extension cable, which filled the bill. 1. On each half-cable, twist its two positive leads (represented in the drawing by the thin black and red lines) together, resulting in the positive lead of a mono source from that receiver (represented by a black dotted line). 2. Next, twist the two negative leads from each half-cable (often braided shielding) together and isolate this union with electrical tape or whatever (represented by Twisted the thick gray lines in the drawing). together 3. Now take the two positive leads from each half-cable (black dotted line in the drawing) and connect those to either SRF-59 SRF-59 terminal of a single speaker: they form the two leads of a mono source. Alternately, this can be fed to a pair of mono headphones or, with a mono-stereo adapter, to stereo headphones. In the drawing I show it hooked up to the female stereo jack, and so I had to twist its black and red wires together as well. 4. Plug each of the 1/8 mini stereo male plugs into the SRF-59s, plug in your headphones, and youre ready!

To headphones, etc.

If youre going low-tech like me, you final result might look something like this picture.
The Audio Phasing Technique OK, lets do some audio phasing! 1. Turn both receivers on with zero volume. Note that if both sets arent on, you wont get any volume in the headphones. 2. Select a suitable frequency, one that you know to have a strong station which dominates and a weaker station which is audible in the background. Alternate turning the volume up on each receiver to tune them to the frequency, making sure youre dead-on. 3. Orient the two receivers so that one receiver is nulling the weaker target, while the other is pointed at the weaker target so that it has both stations. That way, one audio channel will have nothing but the dominant station, while the other will have a mix of the two. 4. Re-zero both volumes, and then adjust the volume of the dominant-only receiver so that it is at an appropriate level for listening. 5. Slowly increase the volume of the dominant/weak target receiver so that the audio signal of the dominant station starts to decrease and eventually reaches a minimum. It may even completely disappear! You should be left with whatever station was lurking underneath, or noise if there was nothing underneath. Increase the volume of both receivers if necessary. Adjust the beam of one or both sets, since there may be a better pair of nulling directions than those chosen in Step 3. SRF-59s are great for this, since you can hold one in each hand and swing them around to your hearts content to find the best orientation. With my set-up, once I have the two receivers matched up on a given frequency, I ride one of the volume controls and compensate for any occasional fluctuations. Make sure you keep the two receivers away from each other so their antennas dont passively couple with each other. You can use outboard gear, such as a passive loop, but it has to be EXACTLY the same for both, otherwise the two audio signals will be slightly different.
To make things easier, consider plugging the two audio channels into something with a balance control (stereo receiver, etc.), which then feeds your headphones, making it a lot easier than constantly adjusting the individual volume controls on the SRF-59s all the time. A more sophisticated set-up which incorporates this is shown in this picture, where both SRF-59s are mounted on a tripod, and a balance potentiometer is inside the black box. (Thanks to Bruce Bacon)
My Results In my initial tests, I was rewarded with some interesting results. I first selected my local 630-KCIS, which can be somewhat difficult to null or phase if I want to hear KXFD in Boise, which is usually noticeable in the background. I placed both of the SRF-59s into my two identical Terk loops to get some signal (again, you must have the EXACT same set-up), pointed one straight at my local 630KCIS and one away from it worked like a champ! KCIS essentially disappeared, and KFXD-Boise was sitting there virtually all alone. At my QTH, beleaguered semi-local KXPA-1540 suffers from the IBOC hiss coming from 1530KFBK. One receiver was pointed straight towards KFBK and was all hiss, and the other half-way towards KXPA, not quite nulling KFBK. Guess what the IBOC hiss was virtually gone from KXPA! KXL-750 is essentially a semi-local from Portland. Because of it having both ground and sky wave components, neither electrical phasing nor passive phasing with two loops has ever really worked. However, audio phasing on the SRF-59s worked well enough that I could comfortably hear the conversation underneath from (I think) KOAL in Provo, Utah. KXL's audio null fluctuated a lot, but it was better than I could get with traditional phasing. Finally, 1210-KWMG directs all of its 10,000 nighttime watts straight at me from about 20 miles away. Phasing with passive loops and electrical phasing has never been very effective with this station. Using the audio phasing technique, I was able to make KWMG almost disappear, and heard 1210-CFYM underneath, running only 1,000 watts almost 700 miles away. I had written off 1210 as a potential source of new loggings, but now there is definitely hope, since there was also another station underneath which faded before I could identify it: it was like having an open frequency! Note that both SRF-59s were barefoot here, testifying to the sensitivity of these little marvels. Using Audio Phasing It goes without saying that some stations are easily nulled or phased out of existence (remember, the SRF-59 is a great null producer) so you dont need to go to these lengths. However, this seems to be a valuable tool for many situations when an electrical/magnetic null isnt in the cards. Besides, it is a great excuse to buy another $15 radio! You may not have the resources to buy two Drake R8Bs, but two SRF-59s (and maybe two outboard loops) is probably within reach of most of our pocketbooks. I cant emphasize enough how the two audio sources have to be identical (same receiver, same antenna, etc.). For example, using one SRF-59 barefoot and the other with a Terk loop produced enough of a sonic difference that there was noticeable bleed-through of the pest - I think the Terk tightens up the audio bandwidth, and the higher frequencies from the barefoot receiver easily bled through. Likewise, using an SRF-59 and my Sony 7600GR was a complete failure, given the markedly different audio characteristics of the two receivers filters, audio circuitry, etc. One thing to watch: if you directionally null the pest too well with one receiver, the null may cause the pest signal to flutter, or change/color its audio frequency balance, and it wont match the pest-only audio source very well, resulting in bleed-through of the pest. The technique seems to work best when I null the desired DX target with one receiver (not necessarily maximizing the pest, which still stands alone anyway) to produce the pest signal, and then have the other receiver with more of a mix of the two without necessarily fully nulling the pest; that way you have a similar pest audio signal in both channels, which will more nicely cancel each other out.

Yes, some stations work better than others: for instance, I couldn't do much of anything with some of my strong locals here in the Seattle area, stations which have also been resilient to passive and electrical phasing. In other cases, audio phasing a local out of existence left nothing to hear, since there were no other stations within listening distance that stepped up to take the locals place: using two radios with larger ferrite antennae probably would have worked better. One thing that traditional electrical and passive phasing have over audio phasing is the elimination of adjacent channel slop, especially when trying for transoceanic frequencies in between domestic channels. I have had essentially no success in this area, since getting the slop to be identical on both receivers is virtually impossible. Therefore, dont throw away your phasers, Beverage and EWE antennas, and other gear! However, for on-channel interference, audio phasing can be very effective. Good luck! January 2, 2008