Transmitter built in a card type calculator to hear a minute sound.


 CD-500C






Outline
    

  • With the same size as a common card, thickness can also be made very thin with 4.5mm. 
    

  • It is what smelled under the calculator of this size, and appearance is made to be visible to a portable calculator. 
    

  • Even if it has placed suitably, it is visible only with a portable calculator. 
    

  • Even if it puts on the corner of the room, the conversation of whisper voice can be caught clearly. 
    

  • A receivable distance is about 100m. 
    

  • An exclusive receiver (KUR-400) is used for receiving. When you hear a low voice, please be sure to use an exclusive receiver. And it becomes impossible to hardly catch the noise which the receiver itself takes out with a commercial multi-channel receiver. 
    

  • Prolonged automatic recording is made using the commercial recorder with a voice starting recording function. 
    

  • If Yagi Antenna is used for a receiver, a receivable distance will be prolonged by 1.5 times. 
    

  • It can be heard in the place about 1km away using relay equipment (RP-300A). 
    

Directions
    

  • It is the thing of the state where the calculator of a solar cell formula got in on the main part. The battery is built in the main part at the time of shipment.. It will operate, if a switch is put in. Exchange of a battery removes the battery lid by the side of the main part reverse side. Pressing down a battery lid top with the thumb of a hand, power is applied so that it may shift outside. If it shifts about 5mm, a lid will separate that it is natural. A lithium battery (CR2430) is put into the portion which a main part is round and was dented so that + mark may turn up, and a lid is slid and shut into it as before. 
    

  • An about 1mm slide switch is in the horizontal side by the side of a battery. It is shifted to the direction of a red mark. Then, it will be in a state of operation and an electric wave is sent. 
    

  • The microphone which gathers sound is in the small hole by the side of a switch. If something closes this portion, the power of collecting sound will become extremely weak. The microphone itself breaks and it becomes impossible to gather sound at all, if this hole is poked by something. 
    

  • The notification distance of an electric wave is 30 or about 100m. In the place where the inside of a building and the house build and are crowded, how to transmit an electric wave becomes bad and a receivable distance becomes short. Moreover, the strength of the electric wave discharged in the air changes also depending on how to place the main part of a card type. An electric wave is discharged most efficiently [ setting good of insulators, such as a plastic, ]. As for a metaled board top, the attitude of an electric wave becomes bad. If it puts in into the crevice between metal things, a metal case, etc., it will stop hardly discharging an electric wave. 
    

  • Although it is receivable with the multi-channel receiver of commercial UHF belt, tone quality is bad or notification distance becomes short. the noise which the receiver itself takes out with a commercial general-purpose receiver especially when hearing whisper voice etc. -- and it cannot catch Please be sure to use an exclusive receiver. If Yagi Antenna (NY-399B) is used for a receiver, receiving distance will be prolonged about 1.5 times. 
    

  • Automatic recording can also be carried out to the recorder with the commercial voice starting recording function using the recording code of attachment in an exclusive receiver (KUR-400). When you make it automatic recording, please be sure to carry out a check of operation. It checks whether make sound with pocket radio etc., an electric wave is made to send, there is no noise in a receiver, and it is finely audible. The recording code of receiver attachment is put with after that in the earphone terminal of a receiver, and the external microphone terminal of a recorder, it sets to sound starting, and a recording button is pushed. Since it is the mechanism recorded only when sound has been noticed, when required, it can be heard collectively later. Since this model is continuation dispatch, the volume of a receiver is adjusted suitably and it sets it up. 
    

  • If the digital recorder of the newest sound starting system is used, more than 10 hour can be recorded continuously, and moreover, it can also take in and save and reproduce in a personal computer. 
    

Specification of CD-500C
    

      

        
Transmitter built in a card type calculator to hear a minute sound.
        
Moduratin system Narrow-band frequency modulation 
        

          

            
(maximum frequency deviation +- 10Khz) 
            

        Transmitter Supply voltage 3V 
        
Consumption current 6mA 
        
Use battery Lithium battery (CR2430) 
        
Continuation use time 40 hours 
        
Dispatch output of an electric wave 3mW or less 
        

          

            
(resonated type helical antenna built-in) 
            

        Dispatch frequency Three kinds 
        

          

            
A channel 398.605Mhz 
            
B channel 399.455Mhz 
            
C channel 399.030Mhz One either 
            

        Outside size Length 86mm, width 55mm, height of 4.5mm 
        
Weight About 20g 
        

Notes
    

  • Please twist a main part or do not throw it. Please do not do by any means what attaches a microphone hole. It becomes the cause of failure. 
    

  • Please do not attach a magnet in a main part. An electric wave does not become weak or it stops coming out..