Here is a collection of links on the internet with all sorts of information I have found.
Drake List
Orion HF transceiver
Huff and Puff webpage
The DX Prowess of DX Receivers
Misc VHF/UHF receiver articles:
R-4C related:
Introduction
After having had a Drake R-4C in storage for a few years, I developed an interest in "solid stating"
and "hardening" the receiver.
Over the years past, a lot has been written about this 30 year plus receiver and it is still considered by some,
a competitive
weak signal receiver.
ARRL R-4C review ( 1 1974 )
DDS-4, the luxe Digital Tuning System
Drake Mods - R-4 Mods and Tech
Authored by VE3EFJ1
PTO maintenance
Technical Notes
More PTO maintenance
PTO grounding
Bearing alignment of PTO
PTO geras!
Mods-DK
Mods-DK3
Mods-DK2
More on Mods
SN16913 (Balanced Mixer)
Drake Mods by VE3EFJ
R4B and R4C mods
R4C mods by SM6PRZ
Dayton 2004
Dayton (2)
Dayton ( .pdf )
Drake classifieds
Sherwood Engineering-1
Sherwood filters
TX filters in R4C
( 5645 kHZ filters )
Fast Copy
Bob's Notes
Receiver Test Data
Dynamic Range data
Sherwood Engineering Kits
Sherwood Engineering update
WB4FHN Drake Page
R4C power supply mod.
Drake PTO by WB4FHN
Drake Technical Tips
New Noise Blanker for R4C by KL7NA
R4C Noise Blanker, Manuals and More
Receivers by W8JI
Receiver Tests ( W8JI )
Receivers by IM3 ( W8JI )
R4C short comings
On BFO carrier injection ( W8JI )
More on the R4C short comings ( W8JI )
More on the 2d mixer carrier injection ( W8JI )
R4C mods ( W8JI )
R4C Mods ( W*JI )
R4C Manual
Drake PTO repairs
More Drake Manuals and Schematics
Audio pass bands with stock filters
Cleaning of R4C wafer switches
On Sherwood filters
R4C filters
More on Drake mods
The DX Prowess of DX Receivers
New audio output for R4C
R4C parts and layout CD
Drake stuff by LA6OP
6EJ7/EF184 3d mixer
RR-$C mods by LA8AK
On RF stage mods
Satori Associates
SM6RPZ mods
TL422
TL422 (1)
TL422 product detector
MC1496
EB5AGV repair notes
N9BOR Drake notes
Drake Parts and More
DeoxIt power booster
LO synthesizer for Drake
Crystal eliminator
RX350D-HF receiver
Optimal uses of Orion Receiver for weak siganl Dx-ing and contesting
Hardware changes(1)
Hardware changes(2)
Hardware changes(3)
Hardware changes(4)
Hardware changes(5)
Hardware changes(6)
Hardware idea's(7)
Hardware idea's(8)
Hardware idea's(9)
DSP or not?
R4B/C mods
Pass band Tuning in R4C
Huff and Puff for R7A
Solid stating a R392, contributed by W3WOM
Going solid state:
J300
Product detector/mixer
Old stuff D40N5 ( ECG171 )
FST3125 hi level mixer
Progressive Receiver
Super receiver
Philips appplication note
PTO Huff and Puff
K7HFD low phase noise Oscillator
RX links
SS T368 vfo
RV7 Solid State PTO
PTO/PA0KSB
Roofing Filters!
Inrad on Roffing Filters
Reciever survey
136 kHZ receiving
Linrad
Extreme narrow band techniques
Inrad experimental filters
R390/75A4
Inrad filters
Front End idea's
LA8AK pages
Receiver measurements
Davco 30
Davco 30
NE/SA602
More on the Davco( New RF stage )
IC-7800 FT-1000MPMkV Frontends
Roofing Filter in R390
Huff and Puff
RF Design updates
