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Drawings are NOW in 2-colour BW 600 DPI TIFF format with LZW or G4 compression. They are very hi-res inside the PDF's Latest change: Highres TIFF removed due to lack of provider storage Only in PDF will do....
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SHAME/pillory/scandal: April/May-2017, virus uploader on my FTP server:
This person was trying to fuck-up the upload folder on my PE1ABR server
With analyser software I found a whole list of them, they all act in the same way!
IP Address | Country | Region | Street, City |
37.55.94.231 | Ukraine | Kharkivs'ka Oblast | Molochna St., Kharkiv / Charkov |
Links to original | NRD-515 drawings: |
Item (All 2 colour 300 or 600 DPI High Res TIF files) | Highres TIF in PDF file | |
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Anti mains rattle feedthrough rectifiers on regulator board. Adding extra capacitors on the AC side of the rectifiers. Modified version. | ||
Safety modifications mains filter to comply with new regulations. IEC power input exchange with real mains-inlet filter. Click on IE icon to see a sub page with mains-inlet pictures. | ||
A PDF (only) version of the CPA-94 main tuning dial encoder board. Thanks to cooperation with PA0A (Ex: PA0AWN) who did the research. | ||
A PDF (only) version of the CGA-68 main (triple) VCO unit. | ||
A PDF version of the CGA-94, the JST-100 triple VCO unit. Compare this with the above CGA-68, the CGA-68 decoupling has been improved. | ||
A redesigned PDF (only) version of the original JRC 455 kHz filter board. It is meant as a replacement of the original board and for the same filter types. Due to public demand I made my own layout. Meant to etch your own filterboard!! | ||
A redesigned PDF (only) version of the ESKA 455 kHz filter board. This board is for high quality ceramic filters, NO Xtal types. A Kokusai is still possible. NO transformers, only LC and CL networks. Added is a DC separation Cap. Due to public demand I made my own layout. Meant to etch your own filterboard!! Please keep in mind to use the proposed screened coil caps or coil forms!!! Or use small 4A11 toroids! The circuit is very sensitive to HF leakage! | ||
A very small add-on board for the above two filter boards. It can hold two ceramic SFR or CFW types in cascade, a plug-in for in a Kokusai position. No -60 dB far suppression, but near -100 dB (or more) is possible! Meant to etch your own filterboard!! | ||
Two more (different) very small add-on boards to hold two cascaded SFR or CFW455 type filters. The footprint in these versions is equal to the bigger 'metal' Murata filters. | ||
A slow homeserver http link to the complete NRD-515 instruction manual. With all the A3 diagrams inclusive!! All 600DPI, size about 5 MB | ||
A slow homeserver http link to a complete reworked NRD-515 service manual. Also with all my A3 600 DPI diagrams inclusive!! The original scans are in 400 DPI, but they are all hacked, cropped, cleaned/stuffed and edited by me. And with some additions. More than 100 pages! More than 35 annoying typos graphically removed. |
Links to original | NDH-518 drawings: |
Item | Highres TIF in PDF file |
Memory Unit NDH-518 circuit diagram (made from TIFF-G4) | |
Modified memory unit diagram (for the options/modifications further below) made from TIFF-G4 | |
Complete scanned NDH-518 Memory unit instruction manual With A3 diagram inclusive | |
Complete scanned original NDH518 Service Manual, scanned not in the most ideal settings according to the latest standards, but this is all that is available!!! Thanks to Mike - VK4GV | |
Mike - VK4GV also pointed me on the memory card in a plastic sheet that was with the memory. Hell, I just forgot to add it to this page! Here you find a highres 600DPI black and white scan that you preferably print on yellowish 200 grams heavy card-paper. Yes, it was yellow, see the second scan in color. But preferably print the BW version on yellow paper. Its a lot smaller in kilobytes and even sharper. | BW Y |
Complete NDH518 Service Manual, not the same as above, but a completely reworked version. Hardly readable 256 color gray datasheets in only 100 DPI replaced with my own scans from NEC book. Bi-lineair pixel enlargement, histogram push and conversion to 2-color TIFF-G4 in 300 DPI for those pages that cannot be replaced. Circuit diagram replaced with own A3 600 DPI scan. Overview diagram replaced with scan from users manual. Added a page with memory test info. And take a look at the front page. Much more info, due to lossless 2 color compression 4x smaller than above! |
Links to NRD-515 test reports and other documentation sent to me as a gift.. |
Item - colored text in a second language | |
JRC NRD-515 test report in German language from the magazine 'Beam', February 1982 edition JRC NRD-515 Testbericht in deutscher Sprache mit technischen Daten aus der Zeitschrift 'Beam', Ausgabe Februar 1982 | |
JRC NRD-515 test in German language, extract from the magazine 'Weltweit Hören', December 1980 edition JRC NRD-515 Testbericht in deutscher Sprache mit technischen Daten, Exzerpt aus der Zeitschrift 'Weltweit Hören', Ausgabe Dezember 1980 | |
JRC NRD-515 test in German language from 'Kurzwellenempfänger - Die Qual der Wahl' by Rainer Lichte, 6th edition from 1984, an equivalent English phrase for the booktitle would be: 'Shortwave receivers - The Agony of Choice' JRC NRD-515 Testbericht in deutscher Sprache mit technischen Daten aus 'Kurzwellenempfänger - Die Qual der Wahl' von Rainer Lichte, 6. ausgabe 1984 (gleicher Inhalt wie in der Zeitschrift 'Weltweit Hören', Ausgabe Dezember 1980) | |
Some pages with a NRD-515 (plus Gilfer version) review from the 1982 edition of the WRTH TIFF processing complete! | |
The advertisement with the NRD-515 from the 1982 edition of the WRTH The image is very reduced to 2-color to reduce kilobytes (15 times smaller), but will print pretty OK. It has a clumsy mistake, do you see a small picture version of the NSD-515 transmitter? NO, it is also the Rx! | |
An earlier advertisement version with the NRD-515 (almost the same as above) with the previous version of the memory unit: NDH-515. Here the transmitter NSD-515 has the correct image! This version is in color! | |
Original NRD-515 German language user manual from Richter & Co., Hannover Original NRD-515 deutschsprachige Bedienungsanleitung von Richter & Co., Hannover | |
JRC NRD-515 review report by Kirk Allen and David Clark from Fine Tuning's Proceedings publications. This is NOT the same version as on other sites on the web, this version is brushed, stuffed and cleaned. I also replaced the images with better scanned (identical) versions! | |
Only for the German (Richter ?) version, simple reverse engineering sketch of a strange add-on PCB that blocks Rx under 146 kHz. The identification name on the board is 'NRD-515 RFK', RFK probably means RicoFunk? Nur für die deutsche Version (Vertrieb Richter & Co.?) : Die deutsche Version (vielleicht nur die welche über Richter & Co. vertrieben wurden mit FTZ-Nummer?) hat einen eingeschränkten Empfangsbereich. Empfang unter 146 kHz ist nicht möglich, das Gerät wird 'stumm'. Hier das 'Reverse Engineering' des PCB und der Beschränkungs-Schaltung. Simple PDF-Skizzen.Diese Schaltung kann relativ einfach entfernt werden! Im 'Beam' Artikel oben ist diese zusätzliche Schaltung in der Nähe des Abstimm-Encoders zu sehen. Identifikation ist 'NRD-515 RFK', RFK bedeutet vielleicht RicoFunk? | |
Original SUMICON/HIROSE 1600 series connector PDF, plugs widely used in JRC equipment! I also made a small TXT list with order info about those connectors. Click connector icon right or HERE to see that list. | |
Bernard Malet sent me a document with his search for replacement VHF transformers, widely used in the NRD-515 in the 65 - 71 MHz circuits. They do not seem to exist anymore and were specially made for JRC by SUMIDA. In this PDF document a method to wind them yourself on similar VHF cores from TOKO. At a local electronics shop (Kent Electronics) I myself have found similar TOKO VHF transformers that could also be usable. Maybe even without rewinding, if needed, only adding a secondary winding. Click image right to see my own replacement document. The PDF icon is the document from Bernard. |
GOTO NWG-515 Remote VFO section on this page | NCM-515 | ←←← LOOK, LOOK, AAAHHHH Click over here for a scanned NCM-515 manual. Made with an Acro-7 scan plugin, but compatible with Acro 5 and above. I've added the very hard to obtain diagram of the connector box CQE-515 as last page. Also read my Addendum for the NCM-515 manual | CQE-515 | CQE-515 |
Neverwinter mac download. Click over HERE for lots of PDF files about hardware used in the NRD-515 and in my designs.
And now some links to my modification drawings and designs |
©CopyRight, modifications add-on design, drawings, photographs, Almost all the drawings are made available in PDF format. |
A very simple method to Backup the Synthesizer:
PDF with synthesizer backup circuit to retain the 'VFO' contents during power off. Basically the same circuit as if a NiCd cell was used.., but now with a turbo capacitor connected to TP35, although in early versions TP35 is not there... If you can't find TP35, where should it be on the drawing? And where on the board? |
BFO control only for BFO/BC-tune button with Auto BC Tune (v1.1):
The BC-TUNE tuning can be automated! The tuning voltage is exactly measured and that information is put into an EPROM. A new Visual Basic utility to convert the measured info to EPROM data is available now! A D/A converter makes tuning voltage of the EPROM data again. More easy BC tuning and the BFO tuning now also works on the BC band. A very small portion of hand-tune is still available to check the auto tune. The original version used a cheap Ferranti D/A chip that is hardly available nowadays. EnglishDutch Diagram BC-Tune D/A converter and amplifier PDF with BC-tune PCB layout - both sides ZIP file with example eprom file + QuickBasic 4.5 eprom creation programs - comments in DUTCH |
A new version 2.0 of the Auto BC Tune with more recent DA-converter:
(And a NEW VB6 conversion shell)
EnglishDutch Diagram BC-Tune D/A converter and amplifier new BC-tune PCB layout - both sides New ZIP file with example eprom file + NEW Visual basic 6 EPROM creation program - And a part of the program listing from VB6 - comments in DUTCH, with simple English Notepad HELP file. Diagnostic output with over 1000 lines of calculation results. Due to this list with tune info some minor roundup bugs removed. If your XP or W2K is very 'clean' you also need the VB6 RUNTIME and dialog files |
Service Manual Bmw
Memory Modifications
Microsoft paint online.
Only a limited number of memory channels were originally used. From 1x 24 in the earlier NDH-515 to 4x 24 in the NDH-518. There are many more channels available, e.g. 256! Here some tricks to address them in binary mode and convert the display view back to decimal (in BCD mode). Eventually you get (max.) 8x 32 or 4x 64 channels! If you change as less as possible on the outside of a NDH-518, only one switch will double the available channels from 4x 24 to 8x 24. Or for the NDH-515 with an extra (rotary) bankswitch from 1x24 to 8x 24! In the inside mostly a chip for coding from BCD to binary and a second chip back from binary to BCD (for the correct display view) is always needed. This could be with a GAL array or an EPROM or both. To address them all in an easy way also an additional UP/DOWN counter board was designed. But a more simple version with extra bank-switches is also possible. | The Up-Down PCB |
Modifications executed on a NDH-515 memory unit: Orange tree samples evolution strawberry (electric.
This is the least complex version, only an 8 channel bankswitch is added and of course the binary encoding and binary-BCD decoding chip. This will give 8x 24 channels in place of the original 1x 24. If you look at the neat way it is added you wonder why JRC didn't do it this way. PDF with binary coded decimal add-on universal (new) switch board for NDH-515 ZIP file with Gal array decoders - EQN and JED files Circuit diagrams are for a slightly (minor) different GAL version as NDH-518 PDF with circuit diagram GAL expansion for NDH-515 memory unit | Sub page with some pictures |
UP/DOWN counter control for a NDH-518:
To address all channels in an easy way an additional UP/DOWN counter board was designed. The rotary 24 position switch has been replaced with an opto encoder. Like the tune dial! PDF with up/down countercontrol add-on board PCB CAD PDF with circuit diagram binary UP/DOWN counter control PDF with binary to BCD decoding for displays with eprom - 64 channels p/bank PDF with binary to BCD decoding for displays with GAL - 32 channels p/bank Zip file with GAL related JED and EQN files for new 32 channel GAL version 64 and 32 decoding chips can also be used for the (above) 24 channel rotary bankswitch version | Sub page with some pictures |
Accessibility modification on a NDH-518 unit to
make it into a remote controllable memory:
This is the MOST complex version, NOT advised to start with!! PDF with circuit diagram part 1of 5 for memory accessibility options (Memory control and read-out mod) PDF with circuit diagram part 2 of 5 for memory accessibility options (Up-Down control board with some additions for remote control) PDF with circuit diagram part 3 of 5 for memory accessibility options (Internal connections between sub-boards) PDF with circuit diagram part 4 of 5 for memory accessibility options (I/O buffer board and I/O connector wiring to external controlbox switches) PDF with circuit diagram part 5 of 5 for memory accessibility options (The channel control part of the external control box) PDF with PCB CAD layout for memory accessibility options inside the NDH-518 PDF with PCB CAD layout control box for memory accessibility options PDF with PCB CAD layout Up/down countercontrol add-on board PDF with front panel example control box for memory accessibility options Zip file with GAL related JED and EQN files for new 32 channel GAL version (same GAL-chip and up/down CAD board version as NDH-518 above) | Sub page with some pictures |
Too bassy sound?
Early versions of the NRD-515 rev A and rev B had a bright, but somewhat distorted sound. Revision C had the bassy sound, for most people a little too bassy. It all has to do with the value of capacitor C333 (near TP-28), which is part of a low-pass network. In rev-B I've seen the value of 1 nF, which is wrong. In rev-C I've seen a value of 33 nF ( = 0.033 uF) which is just a little too high. The one and only correct value for the most perfect sound expirience = 22 nF = 0.022 uF. If you change this capacitor C333, it is wise to change another cap C330, the one for side-tone IN. It does NOT change anything to the side-tone IN sound, but now you can (mis-) use this input for an external FM or ECSS-AM decoder. I have used a value of 0.56 uF which was available. |
AM detector buffer: