I work as electronics circuit designer for small companies do not need full time person, or companies who need temporary/part time worker.  mostly  RF design below 1000 MHz, PCB layout, firmware programming with C. experience with designing to pass FCC parts 15, 90, 95, 97 devices. 

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Projects

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Amateur Radio related files

[ those files below are reference only, just showing what I done to my radio or  equipment, NOT intended for instruction on how to repair or modify]

Vtech  CS-6309 handset unit re-register to different base unit.

code.zip Morse Code Program download ( DOS program. best to run with DOSBOX )   DOSBOX website, install one for Windows --> http://www.dosbox.com/download.php?main=1

Ionogram Data ( Vertical HF radar of ionosphere )

Radio Mobile ( Free Radio Coverage simulation )

811-tube-pic-damaged.zip   

Ameritron-AL-811--1995---internal-pictures.zip

baofeng--UV3R--pictures.zip  

baofeng--UV-5R--pictures.zip  

icom_ic2at_picture-inside.zip  

TECSUN-PL-660-shortwave-radio-receiver.zip  

wouxun--KG-UV3D---144MHz--222MHz--dual-band-HT---pictures.zip  

yaesu--FT-1500-internal-picture.zip   

Yaesu--FT-450D-pictures.zip   

200wts-dummy-load-1.pdf

BNC-connector-wrench--home-made.pdf

GRECOM-PSR-300--battery-slow-charging-mods.pdf

GRE-PSR-300-earphone-jack-to-speaker-jack--increase-audio-output-level.pdf

MFJ-962D-added-ball-bearing-to-inductor-shaft.pdf

Radio-Shack-DX-398-Sangean-ATS-909--FM-broadcast-frequency-expansion.pdf

TEN-TEC--OMNI-V---562--picture-inside.zip

TEN-TEC--OMNI-V---562---manual-schematic.7z

TEN TEC OMNI-V   mods to power adjustable to below 5 watts.pdf

ten-tec-omni-v--audio-pop-noise-mods-2011-09-30.pdf

TEN-TEC-OMNI-V--CW-RX-W-NOISE-BLANKER-ON-AND-OFF.mp4

TEN-TEC--OMNI-V--CW-RX-w-remark.mp4

TEN-TEC-OMNI-V--replaced-Relay-output-with-MOSFET.pdf

TEN-TEC--OMNI-V--work-down-to-9V-mod.pdf

Yaesu_FT-2800M--loose-knob-dial-FIX.pdf

yaesu-ft-2800m--adding--external-fan.pdf

YAESU-FT-2800M--INTERNAL-PACKET-APRS-CONNECTION-MOD-w-mic-mute-2014-07-11-1.pdf

yaesu--FT-450D--20dB--ATT--disable--below-1700kHz--change.pdf

6kHz wide FM ( can be used for HF ? )

Radio Simple Control

Bandwidth Efficiency of ( Morse Code / CW )  and ( Voice / SSB ).

GENIE-series-2-garage-door-opener-control-schematic.html

samsung_washer__WF306LAW_XAA   Repair

Good you tube Video on how to correct skidding car on ice.

CB or HF antenna mount using Attachable TOW HOOK came with car.

Passed Projects

Crystal Ladder filter using inverted Mesa 142MHz

Subaru car maintenance

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Suction antenna mount( used for moving glass) Since, it does NOT have good ground, must be used with Half Wave Antenna. Half Wave design antenna, such as MFJ-1412 does not require good ground plane. 

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2023-12-16

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