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70cm Projects - Transceivers

Click to enlargeA synthesizer-controlled 70cm-transceiver for 9600bd packet radio by DF2FQ
Until today, more than 10 years after the publication of the G3RUH-modem, there exists not a single radio from the large amateur radio manufactures, which is suitable for operation at 9600 bit per second with a sufficiently good quality. What are the problems?
http://www.la3f.no/prosjekt/t7f/t7f_e.html

Click to enlargePacket trx Nokia MD59LS by PA3GCO
This is a description of the conversion of a second hand carphone into a packet transceiver in the 70 cm band. Needed are a controller and an rf switch circuit with pindiodes
http://www.qsl.net/pa3gco/zelfbouw/nokiasmal/nokianarrow.html

Click to enlargeSimple 430 SSB transceiver by JF1OZL
This is my first 430-SSB-transceiver. This is very simple. This transceiver uses bilateral theory in many parts of whole configuration.
http://www.intio.or.jp/jf10zl/430ssb.htm

Click to enlargeUpgrade Nokia wideband FM by PA3GCO
In part 1 the Nokia MD59LS has been converted to a 9K6 packet transceiver. Now it's possible to increase both rx and tx bandwidth, for wideband use. A bandwidth of 300 kHz is easy to achieve.
http://www.qsl.net/pa3gco/zelfbouw/nokiabreed/nokiawide.html


Creation date : 16/08/2007 @ 18:52
Last update : 07/09/2018 @ 21:24
Category : 70cm Projects
Page read 18986 times


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