NěSS' Amateur Radio Page
General Interest & Kit Building Files
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General Ham Radio-Related Files
CW Operating related files on this site:
(NOT exhaustive) and QN-Signals (for CW Net operation) - PDF (97kB)
AMPLIFIED (EXTERNAL) SPEAKER MODS
This PDF file is a compilation of wiring mods for a number of different models of Motorola (external) Amplified Speaker to allow them to be easily attached to just about any radio or scanner with an external speaker jack. (Document is now searchable)
PDF formatted file (1.2MB) (Last updated: 07 July 2009)
REPLACEMENT AMPLIFIER FOR OLDER STYLE
MOTOROLA EXTERNAL AMPLIFIED SPEAKERS
Motorola offered several types of their external amplified speaker.
While the case styles were quite similar (see above), the PC board and mounting bracket
differed between two general styles (below), which I shall refer to as Type 1 and Type 2.
Type 1 - Motorola AF Amp PC board and mounting bracket
Type 2 - Motorola AF Amp PC board
These PDF files contain information about the replacement 5W-7W AF amplifier I built to replace the damaged amplifier in a speaker which was given to me. The circuit utilizes a TDA2003V 10W automotive radio AF amplifier IC (less than $2 from Mouser) and standard discrete components. The IC does require a small heatsink, but it does not develop a lot of heat to be dissipated, so heatsinking is minimal as long as the amp if powered from 12VDC. Quiescent current is about 36mA. The example shown below is my replacement for the Type 1 external amplified speaker amp.
documentation for my replacement Motorola
External Amplified Speaker Amp. for TYPE 1 enclosures PDF (1.05MB)
documentation for my replacement Motorola
External Amplified Speaker Amp. for TYPE 2 enclosures PDF (1.33MB)
TDA2003V 5W-7W AF Amplifier for 12VDC Operation 300kB PDF (rev. 03/19/2004)
This AF amp is a compact version of that shown above. It is designed to
12VDC and to drive a 4-Ohm (or lower impedance)! If you drive an 8-Ohm load, it
will only provide about 2W of output. Absolute maximum supply voltage is 18VDC.
PC board size: 3-7/8" X 2-3/8" (98.4mm X 60.3mm)
HF thru UHF (440MHz anyway) 30W+ Cheap 'n Dirty Dummy Load PDF 600kB
1223 / KENWOOD KPS-15 / YAESU FP-1023
12VDC 22A Switching Power Supply Service Info
PDF (1.34MB) Includes Schematic and Parts List. (Updated: 18 Jan 2008)
Now includes a completely re-drawn schematic (MUCH easier to read),
and pictures showing the jumper for conversion from 120V to 220V AC
Nigel Hayton, ZL2DF's, RFI (Hash) Reduction Mod to his
Nigel reports these simple changes reduced his S-9 160M birdies to S1-2...!
PDF (771kB) Includes re-drawn SEC 1223 schematic, drawing and pictures of the mod. (Updated: 17 Dec 2004)
Files for the Idiom Press Logikit CMOS 4 Electronic Keyer
Official CMOS 4 User Update - Idiom Press
Modification to the Vreg Circuit to prevent battery discharge when in stand-by mode
The modification below was intended to address a known problem with the original
Idiom Press Logikit CMOS 4 Keyer which caused the keyer to become unstable and to
often either lock up, or to voluntarily start sending 'trash' (with or without an operator
being anywhere nearby). At that time, the solution was to remove power from the
keyer by either adding an ON/OFF switch or to open up the keyer and remove one
battery for a short period of time. I went for option #1, but using a momentary OPEN
microswitch accessible through a hole in the bottom of the keyer case.
NOTE: Idiom Press now has a 'FIXED' IC for the Logikit
CMOS 4 Keyer which DOES cure the lock-ups
addressed by the CPU Reset switch mod, below.
Contact Rob (W7GH) at Idiom Press <firstname.lastname@example.org> and
arrange to Return your current CMOS 4 IC for a replacement. Well
worth the time and effort...!
Adding an Externally-Accessible CPU Reset Switch (Updated: 20 Mar 2006)
When I first published this mod, I was merely interrupting the DC power
connection to the keyer. This method was fairly reliable, but NOT totally
satisfactory. This new set of docs provides for a 'HARD RESET' of the
keyer's CPU by grounding the RST line (pin 1 of U1) via a microswitch
which is installed so it can be easily accessed via a finger-hole in the
bottom of the keyer case. The switch button is recessed so it won't be
accidentally activated during normal handling. I believe this mod is also
applicable to most (if not all) other Idiom Press CMOS-x as well.
Line Noise Locator
Reprint of an article I had published in WorldRadio Magazine a few years ago PDF (406kB)
Files Related to Building
COLOR CODES PDF (233kB)
8-1/2" X 11" - Suitable for Laminating or Hanging on the wall
TIPS, Useful Soldering Hints PDF
This article was specifically prepared for the Elecraft Co., makers of Amateur Radio kits, to
assist their builders in successfully completing their kits, but it is applicable to all builders
Accessories for the Hakko 936-xx Soldering Station PDF (876kB)
Hakko 936-x Schematic & PC board Layout w/Parts ID's & Values PDF 976kB (Revised: 03 APR 2011)
Note: This file
is (as far as I have been able to ascertain) the ONLY AVAILABLE
ACCURATE copy of the Hakko 936-x Temp-Controlled Soldering Station
available on the web. It was hand-rendered from the PC board and is
a faithful description of the parts and component values for this device.
Hakko 936-x ON/OFF LED MODIFICATION PDF 976kB (Revised: 03 APR 2011)
file now includes an ACCURATE full schematic
and annotated PC board parts layout for the 936.
there are NO other accurate schematics available for
the HAKKO-936 available on the web!!!
A simple and
effective way to arrange your kit-building parts,
using a corrugated cardboard box (a la Heathkit, ca. 1960)
(click on picture for a larger view)
How I Make My PC Boards PDF 140kB (03/03/2006)
A short document on the methods I
use to make PC boards
CW Keying which YOU can build - PDF
PC board-based parallel port CW keying adapter. Includes CW Key Output to TX
and (if you choose to add them) Paddle Input and PTT Output as well as .
PC board design is provided if you wish to make your own PC board, or the PC
board may be purchased directly from me (NěSS) for a nominal cost.
Drake Heterodyne Oscillator Xtal Eliminator
Personal Assembly Notes regarding the project by Steve Hageman, which
was published in the June 2004 issue of QST magazine, page 28.
PDF (428kB) (last updated: 20 Mar 2005)
Assembly notes, accumulated as I acquired parts and assembled the Drake Het. Osc. Xtal. Eliminator
These notes now include possibly helpful additional comments from other builders as well.
These notes are unofficial (and unblessed by the author), but you may find them to be helpful as you build.
Excel spreadsheet of parts, vendors, and prices for this project
PDF (27k) (last
updated: 25 Feb, 2005)
NOTE: This is a VERY WIDE SPREADSHEET... It's probably best to NOT attempt to print it out.
"Kitchen Scrubbie" (coiled stainless steel) soldering iron tip cleaner PDF (136 kB)
Copper wire tables, drill bit size, nut & bolt information and other possibly helpful info PDF (47kB)
4- & 5-band Resistor Color Codes and fractional/decimal/mm conversions, PDF file.
Hi-Q 4/80, 5/80, and 5/160 HF Mobile Antennas
Installing an INTERNAL Turns-counting Reed Switch in older Hi-Q models (PDF 1MB) 08/10/2005
Tower Cable Lubricant Catcher
This lubricant over-spray 'lube catcher' helps to
concentrate your tower raising/lowering
cable lubricant where you want it... ON THE CABLE. Especially handy when you're up on
the tower, trying to spray with a 20MPH wind howling around your ears.
Lube Catcher Docs Version 1.2 (PDF 1.12MB) 10/30/2006
The following files are (definitely) NOT QRP-related...!
Heathkit SB-220 Schematics. Completely redrawn. Hi-Res (600DPI) rendering.
These schematics were drawn because, if you are like me, your original
schematic looks pretty 'ratty' by now, and we deserve to have clean
schematics with which to work!!
SB-220 Schematic, 1-pg. 11" x 14" in size PDF (228 kB) Updated: 21 October, 2006 (v1.4)
SB-220 Schematic, 2-pg. 8.5" x 11" in size PDF (277kB) Updated: 21 October, 2006 (v1.4)
Note: If you have access to CorelDraw v6 or newer and wish to obtain copies of
my CDR files for these schematics, please drop me a note, and be sure to indicate
the version of CorelDraw you are using. I may be able to provide these drawings
to you in other more compatible formats. If you have a need, please don't be afraid
to drop me a note and ask.
Some Really NICE, Yet Economical, CW Paddles
VIP Paddles, by Vidi, ZS1EL
For more info, please visit: http://www.zs6kmd.za.net/vidi/zs1el.htm
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