DF1UD EN
70cm TRX
Homemade
70-cm Xtal-channel FM-Transmitter-Receiver
Mini 70
Built in 1982. Source was Ewald Goebel - 7500 Karlsruhe - DK2DB
Built on unilaterally printed circuit board. The casing from unilaterally PCB - material manufactured and soldered. Control elements. Antenna manufactured. The alignment resulted with simplest measurement utilities, whereby also kit helped -experienced OM's kindly.
The Mini 70 is fully workable still today, if it has suffered also in the course of time something. Here from Ketsch I can work always still the Repeater in Mannheim ( approx. 25 km as the crow flies)
Was really an experience the first QSO with this 'Zwerg' small for then times. Commercial Handhelds were to this time, if at all, very, very costly. This Handy has made really very much joke
In the course of time became some repairs necessary. On the basis of some SMD - components was this venture quite difficult and led to an unsightly platinum.
The technical data are no longer fully available.
Frequency range for Relay R85, u.a. Mannheim DB0MA |
|
Rx |
439,025 MHz |
Tx |
431,425 MHz |
used XTAL |
28,76166 MHz für Relay R85 |
Power supply |
9 V, Battery |
Power Input standby |
ca. 10 mA |
Power Input at transmission |
ca. 45 mA |
Power Output |
> 100 mW |
Sensitivity |
<= 1 uV / 10 dB |
Tone Call |
1750 Hz |
Dimensions |
(60 x 160 x 22) mm, (2,4 x 6,3 x 0,9) inch |
Some Picture
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