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Last Update: 18.12.2013
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Circuit Diagram´s and PCB designs regarding the renovation and modifactions could be fined at: Concepts for TR7 pages

Click, hereto 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


design-mic-for-renewedtr7.jpg (15932 Byte)


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







Voranschit des Netzteils für TR7 mit eingebautes Lautsprecher

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Front Side Power Supply with built in speaker for TR7



Obenseite des Netzteils

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Top Side Power Supply




Innenleben Netzteil TR7 Obenseite

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Top View  of Inside of the Power Supply TR7




Innenleben Netzteil TR7 Untenseite

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Bottom View of the Inside of the Power Suply TR7



Hintenseite Netzteil

rear_power_supply.jpg (42372 bytes)

Rear Side Power Supply TR7



20 dB Pre amplifier for driver 100 Watt Mosfet PA +10 dBm out

20db-verstärker.jpg (32278 Byte)

20 dB Vorverstärker für Treiber 100 Watt PA +10 dBm ausgangs Pegel



100 Watt Mosfet PA for TR7

100watt_mosfet_pa_tr7.jpg (40742 Byte)

100 Watt Mosfet Endstufe für TR7


DSP Eingebaut
dsp_built_in.jpg (61467 Byte)

DSP Built in





DAFC Eingebaut
dafc_built_in.jpg (69648 Byte)

DAFC Built in

Ciruit Digram DAFC



TR7 PTO Replaced by DDS VFO
tr7_front_ready_for _dds_assembly.jpg (53362 Byte) dds_tr72_built_in.jpg (78675 Byte)
TR7 PTO Ersätzt durch DDS



TR7 PTO Replaced by DDS VFO-2
dds-front-tr7-2.jpg (16948 Byte) dds-tr7-2.jpg (16556 Byte)
TR7 PTO Ersätzt durch DDS-2



First Full System Test with DDS and New Display
first_full_system_test_dsp.jpg (51626 Byte)



Innnenleben mit die neue Modulen unten in TR7
unter_seite_tr7.jpg (93696 bytes)

Bottom Side TR7 almost finished



Sprachprozessor Bauteileseite
sprachprozessor_oben.jpg (57561 bytes)

Speech Processor Component Side



Sprachprozessor Lötseite
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Speech Processor Solder Side




Für Speech Processor Geänderte Transmitter Exiter Leiterplatte TR7
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Transmitter Exiter Board TR7 Modified For Speech Processor





Notchfilter Original Design PA0CHN
notch_filter_oben.jpg (50718 bytes)

Notch Filter Component Side

Circuit Diagram Notch Filter/Schaltbild Notchfilter
PCB Notch Filter





LNA Eingebaut (Low Noise Amplifier)
lna_tr7_eingebaut.jpg (72979 Byte)

LNA built in (Low Noise Amplifier) pre amplifier






LED Hintenbeleuchtung vonn das S-meter
led_s-meter.jpg (68212 bytes)

LED backlight for  S-Meter TR7



led_lamp_compleet.jpg (39977 bytes)





Orignal Sicherungshalter ersätz durch ein Sicherungshalter 5 x 20 mm
new_fuse.jpg (63742 bytes)

Fuseholder & Fuse replaced by a 5 x 20 mm Fuseholder




Neu seite Wände
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New Side Panels





Erhöhung von TR7
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Front Exstention



Front subassembly
front_panel_sub_assembly front_view.jpg (13984 Byte)

Frontplate SubAssembly




Erneute TR7 im Anbau
pa1hfo_tr7_ngh2_nichtlackiert.jpg (27207 bytes)

Renewed TR7 under construction



TR7 fertig

tr7_new_display.jpg (72615 Byte)

TR7 finished



PTO ausgetauscht durch DDS Platine im RV7
dds_remote_internal.jpg (18266 Byte)

PTO RV7 replaced by DDS PCB



RV7-DDS fertig
dds_remote2.jpg (17205 Byte)

RV7-DDS finished


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Phone: +49-(0)5924-997337   Fax: +49(0)5924-997338  Mobile: +49-(0)1573-4023934
E-mail: dk4dds@t-online.de  Skype: marc.van.stralen