DF1UD EN

Modes

AM FM SSB CW QRSS AMTOR ATV APRS CLOVER DRM D-STAR HELL PACKET PACTOR PSK31 PSK63 RTTY SAMS SSTV

Go to content

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
without Antenna

Some Picture

The whole deviceView component sideView solder side

[ CLICK ==> ENLARGE ]

Top

DF1UD | General | Station | QSL- Cards | Oldtimer | Homemade | Flea Market | Impressum | Site Map

Last change: Mrz 15 2016
Site erstellt: Sep 01 2001

Back to content | Back to main menu