JI1FGX/DU9 Mindanao, Philippines Amateur Radio Diary IOTA OC-130
English Japanese



Access until yesterday
Introduction. 【【Lily Diary]
Diary of Life in Mindanao

11/12/16 Flooding in Mindanao
11/12/10 examination hall
11/11/22 DW8BXU to appear in CQ magazine
11/11/18 Auto repair shop opened
11/10/16 WJST JT65A mode
11/10/15 CQ de DW8BXU
Car Repair
11/10/14 Aligned measuring instruments
11/09/23 DW8BXU at 21MHz in Europe
11/09/20 Car repair and rice paddies
11/09/01 Europe at 14MHz for a long time.
11/08/30 Delivered radio equipment
11/08/21 Prepared for opening of auto repair shop
11/08/20 WSJT9 Receiving Edition
11/08/13 Automobile repair shop
11/08/06 EME 17-elec. antenna fabrication
11/08/06 New light vehicle repair
11/08/04 New light car
11/07/29 EME 17-elec. antenna fabrication
11/07/28 private automobile mechanic
11/07/23 Gigi's CQ
11/07/19 EME Antenna Considerations
11/07/12 Optira's Dynamo
11/07/10 EME Antenna Considerations
11/07/06 Passenger car breaks down
11/06/20 Radio Repair
11/06/17 rear monitor
11/06/11 Light truck breakdown
11/06/11 29MHz FM repeater failure
11/06/08 7MHz full size RDP production
11/06/07 21MHz antenna production for EU
11/06/06 I enjoyed DX again today!
11/06/06 Purchased 50 KVA generator
11/06/05 DX
11/06/04 Wireless Shop
11/06/03 parts box
11/06/02 Phonepatch using a cell phone, part 2
11/05/30 Phonepatch with cell phone
11/05/29 Our breaker room
11/05/26 Samway DXV500Z arrives
11/05/22 ONAIR for DW8BXU
11/05/21 7MHz full-size dipole
11/05/14 Buy Hyundai Starex
11/05/13 Buy Linear DXV500Z
11/05/13 Backyard construction
11/05/12 Fawn Patch Consideration
11/05/09 About DX8FAR
11/05/07 DX8FAR restart
11/05/07 X520H repair
11/05/06 Radio Shop
11/05/01 Pole tower collapses
11/04/30 DX8FAR repeater begins operation
11/04/29 DX8FAR uplink construction
11/04/28 DX8FAR uplink construction
11/04/25 29MHz DX8FAR beacon
11/04/23 29MHz DX8FAR Repeater
11/04/22 Backyard construction
11/04/21 Antenna installation for 29MHz repeater
11/04/19 Location of 29MHz Repeater
11/04/18 Hamvention in Bohol
11/04/09 Light truck repair
11/04/02 DW8BXU debuted at 21MHz
11/04/01 29MHz Repeater Modification
11/03/31 Call Gigi DW8BXU
11/03/28 Car Repair
11/03/23 29MHz repeater antenna fabrication
11/03/19 Tools
11/03/15 Arrival of 29MHz repeater equipment
11/03/14 FM Broadcast Commercials
11/03/13 Now a KIA truck breaks down.
11/03/13 Repair of light vehicles
11/03/07 Denyo Generator
11/03/06 DX8FAR Mindanao 29MHz Repeater and Advance Notice
11/03/04 NTC in Cebu Island
11/03/01 Life Membership in PARA
11/02/21 Failure of STANDARD C150
11/02/20 Oscilloscope blew smoke.
11/02/11 SWR at 7MHz is wrong.
11/02/04 Truck Repair
11/01/27 TV antenna sequel
11/01/18 Notice, 29MHz Repetitories
11/01/17 Light truck brake repair
11/01/15 Light truck repair
11/01/08 Business is still going on today
11/01/06 Buy a truck
Return to frame display　
JI1FGX/DU9 Phone patch with cell phone（May 30, 2011)
11/05/12I wrote about the "consideration of phone patches" using cell phones in my diary in the "3.
The circuit has only one IC, JRC's NJM2072.

The right side of the cell phone earpiece goes directly to the microphone jack of the radio
The left side of the earphone goes to the VOX circuit made with NJM2072
VOX circuit output to PTT terminal of radio
Audio output from the radio is connected to the microphone line of the earphone microphone with level adjustment
The hardest part was the earphone microphone.
The earphone is immediately recognizable, but if you tamper with the microphone wiring, the phone will no longer detect the earphone-microphone.
After much trial and error, I was able to detect it by dropping the microphone wire to ground with a 10K Ohm resistor.
At first I was doing it with 1K ohms and had trouble for a day because of the instability of detection and not being able to detect it.
The metal in the middle is the switch for incoming calls. If I didn't have the Automatic Answer feature, I would put the ringtone in the VOX and turn the switch on!
I actually went around the cell phone stores in Osamis looking for one with the Automatic Answer feature!
But no matter which store you go to, you'll find that "indicates negation, inexperience, unnecessariness or impossibilityThey kept telling me, "You're not going to be able to do it.

I decided to use the VOX circuit to realize an incoming call function, and at the last store I stopped at, I found a "VOX" circuit.Please give me the cheapest cell phone. But one that isn't a Chinese knockoff."
I bought a cell phone with the Automatic Answer feature for some reason!
I took a video of the actual operation and communication.
As a practical use, it could be used to keep in touch with workers who don't have cell phones or are working out of range.
It will also be useful for Gigi to give instructions to his workers while he is on a business trip to Cebu Island.

However, the ability to call the cell phone from the radio side has not yet been completed.
I know I can use DTFM on the radio, but I need to receive that signal with a DTFM decoder (CM8870PI).
I still need to convert it to 10KEY with an AVR one-chip microcontroller and connect it to the keyboard of the cell phone.

We found out something very important.
The keyboard of the cell phone was made of carbon with circuits that could not be soldered.
This is the only IC I used.
It was a convenient IC.
May 29, 2011   June 02, 2011