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Software Defined Radio

Letzte Aktualisering: 18.12.2013 Last Update: 18.12.2013
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DRAKE TR7 RENOVATION

DRAKE TR7 ERNEUERUNG

Circuit Diagram´s and PCB designs regarding the renovation and modifactions could be fined at: Concepts for TR7 pages

Click, here, to go to the Concepts for TR7 Pages

Free Circuit Diagram´s TR7

Herunterladen Sie: Schaltbilder TR7 in Höheresolution A3 Format Drücken in A4 ist möglich Dateigöße 6 Megabyte

Down Load: High Resolution Drake TR7 Circuitdiagrams A3 Format Could be printed at A4 File 6 Megaby

Down Load my Article Regarding the TR7 Published in QST April 2009

The Drake TR7 is still a remarkable good transceiver compared with a lot of modern transceivers.
Also the TR7 is very simple to operate, no complex menus, and easy to service and to maintain. It has also good intermodulation specifications.
So I acquired via the internet in Germany and Holland some TR7 transceivers for approx. $150 each and all in working condition.
Of course has the now more then 30 years old TR7 some disadvantages:

The PTO is drifting continuously
Ugly, very heavy and big power supply has same dimensions of TR7
No Notchfilter
Sensitivity on the higher bands is some times to low
No speech processor
No DSP noise reduction
No tune button on the front
Key jack on the back of the transceiver
Bulbs in s meter and analogue dial
Phase noise VCO 116 dBc @ 10 KHz

Improvements made:

New small power supply
built in Notchfilter
Built in speech processor
Tune facility on the front
Built in Pre amplifier like R7
Key jack at the front of TR7
DAFC ( drift correction for the PTO)
Bulbs replaced by LED’s
Blower replaced by a very quiet 12 Volts one
Temperature switch mounted on the heatsink to switch in the blower in at 40 degrees Celsius
Blower direction changed for better efficiency
Restyled modern and professional housing
Mechanical changes front panel height increases with 15 mm
New large Led display
New top cover and under cover
Design Microphone in same style of the renewed TR7

Down Load the de complete renvovation story in English written by DK4DDS in pdf format 2 MB:

Herunterladen Sie die ganze eneuerungs Gesichte von Drake TR7 geschrieben vom DK4DDS im pdf Format 2 MB

Click on this Link www.wb4hfn.com/DRAKE/DrakeArticles/THE_DRAKE_TR7_RENEWED.pdf