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1. (WO1993019437) APPAREIL DE SURVEILLANCE D'ENFANT
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CLAIMS
What is claimed is :
1. An electronic monitoring apparatus, comprising:
a first housing having a pin recess and a pin hole;
a first transceiver mounted in said first housing;
a pin having a point retractably mounted on said first housing, spanning said pin recess and extending into said pin hole, whereby said point extends into said pin hole;
whereby retracting said pin withdraws said point from said pin hole and exposes said point.
2. An electronic monitoring apparatus according to claim 1, further comprising:
urging means connected to said pin urging said point of said pin into said pin hole.
3. An electronic monitoring apparatus according to claim 2, wherein said urging means comprises a spring.
4. An electronic monitoring apparatus according to claim 1, further comprising:
a second housing detachably attachable to said first housing; and
a second transceiver mounted in said second housing.
5. An electronic monitoring apparatus, comprising:
a first housing;
a first transceiver housed in said first housing;
a second housing configured to be attached to said first housing;
a second transceiver housed in said second housing;
a first switch housed in said first housing operably connected to said first transceiver and configured to be activated when said first housing is attached to said second housing;
a second switch housed in said second housing operably connected to said second transceiver and configured to be deactivated when said first housing is attached to said second housing;
wherein said first switch deactivates said first transceiver and said second switch deactivates said second transceiver when said first housing is attached to said second housing, and wherein said first switch activates said first transceiver and said second switch activates said second transceiver when said first housing and said second housing are detached.
6. An electronic monitoring apparatus , according to claim 5, wherein said second housing is configured to be slidably attached to said first housing.
7. An electronic monitoring apparatus , according to claim 6, wherein said first housing has a raised portion and said second housing comprises a belt clip, whereby sai first housing and said second housing can be slidably attached by sliding said raised portion into said belt clip.
8. An electronic monitoring apparatus , according to claim 7 , wherein said first switch comprises a first pushbutton switch and said second switch comprises a secon pushbutton switch, and wherein said first pushbutton switc and said second pushbutton switch are activated when said first housing and said second housing are slidably attache to each other.
9. An electronic monitoring apparatus, comprising:
a first housing;
a plurality of first recharger contacts mounted on sai first housing;
a first transceiver housed in said first housing;
a first rechargeable battery holder housed in said first housing operably connected to said first transceiver and rechargeably connected to said first recharger
contacts;
a second housing;
a plurality of second recharger contacts mounted on said second housing;
a second transceiver housed in said second housing; a second rechargeable battery holder housed in said second housing operably connected to said second transceiver and rechargeably connected to said second recharger contacts ;
a recharger having a first housing portion configured to receive said first housing and a second housing portion configured to receive said second housing;
a plurality of first housing contacts mounted on said first housing portion, whereby said first housing contacts are in recharging contact with said first recharger
contacts when said first housing is received in said first housing;
a plurality of second housing contacts mounted on said second housing portion whereby said second housing contacts are in recharging contact with said second recharger contacts when said second housing is received in said second housing portion;
whereby when a first rechargeable battery is placed in said first rechargeable battery holder, said first
rechargeable battery can be recharged by placing said first housing in said first housing portion whereby said first recharger contacts are in recharging contact with said first housing contacts; and
whereby when a second rechargeable battery is placed in said second rechargeable battery holder, said second rechargeable battery can be recharged by placing said second housing in said second housing portion whereby said second recharger contacts are in recharging contact with said second housing contacts .
10. An electronic monitoring apparatus, according to claim 9, wherein said first housing contacts can be in recharging contact with said first recharger contacts and said second housing contacts can be in recharging contact with said second recharger contacts only when said first housing is attached to said second housing.
11. An electronic monitoring apparatus, comprising:
a self quenched superregenerative detector comprising an active device that oscillates at both a receiving frequency and a quench frequency;

a first semiconductor switch operatively connected to said device to switch off the quench frequency; and
a second semiconductor switch operatively connected to said device to increase power of said oscillation.
12. An electronic monitoring apparatus, according to claim 11, wherein said active device comprises a
transistor.
" 13. An electronic monitoring apparatus, comprising:
a frequency determining circuit for reception; and
a reactive circuit element that changes its value in accordance with applied bias operatively connected to said frequency determining circuit.
14. An electronic monitoring apparatus according to claim 13, wherein said reactive circuit element comprises a capacitor.
15. An electronic monitoring apparatus according to claim 13, wherein said reactive circuit element comprises a coil.
16. An electronic monitoring apparatus according to claim 13, wherein said reactive circuit element changes its value in accordance with voltage bias .
17. An electronic monitoring apparatus according to claim 13, wherein said reactive circuit element changes its value in accordance with current bias .