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Title: 75m direct conversion receiver for the car Post by: ka1tdq on April 22, 2019, 09:47:48 PM I made a direct conversion receiver for 75 meters that I can use in the car. It's a SA612/LM386 combo that uses a digital VFO. I'm surprised at how hot the receiver is for just being one stage. I built it in a clear plastic box that I got from the Container Store. The antenna is an MFJ resonator shown in the photo.
I connect the audio to my car's stereo system via the 1/8" stereo jack built into the car. https://youtu.be/pFP_JBDOj7A (https://youtu.be/pFP_JBDOj7A) Jon Title: Re: 75m direct conversion receiver for the car Post by: WA2SQQ on April 23, 2019, 10:07:22 AM Interesting idea - nice box!
Title: Re: 75m direct conversion receiver for the car Post by: ka1tdq on April 23, 2019, 07:18:02 PM Makes for a busy passenger seat.
Jon Title: Re: 75m direct conversion receiver for the car Post by: W2JBL on May 08, 2019, 07:20:46 PM You might want to consider securing all that stuff somehow. If you crash all that s@#t is going to become airborne and you WILL get hurt. I know because it happened to me many years ago. I was injured by a Lafayette Comstat 25 CB (big heavy tube radio) I had on the seat of my 68 Ford that became airborne and hit me when I crashed it back in 1976. The radio hit my side and cracked a few ribs. Also try mounting the control head for the Alinco on the dash so you can use it without taking your eyes off the road. Another time I wrecked a 1986 Chevy Caprice 9C1 and a Motorola HT600 I had on the back seat took flight on impact (T boned a drunk who turned left 6 feet in front of me and I hit him going 35 MPH ) and after it hit my head and took a chunk out of my ear exited through the windsheild. That was a very high G force collision. Safety first, radio second.
Title: Re: 75m direct conversion receiver for the car Post by: ka1tdq on May 08, 2019, 08:19:55 PM You're 100% right about safety. To be honest, I never thought about the consequences of a crash. it could be ugly.
I have had lots of fun with this setup though. I find myself operating from the car more than home, especially with a drivable mountain near my house. I also enjoy the tech voyeurism when passersby look inside and see all the stuff. Jon Title: Re: 75m direct conversion receiver for the car Post by: KD6VXI on May 08, 2019, 10:08:16 PM I had a friend who was knocked unconscious when an external CD rom burner became airborn in a crash.
He was out for like 10 minutes. Long enough for the paramedics to become fairly concerned. CD ROM burner. That dates the story lol. Circa 1998/9.... --Shane KD6VXI Title: Re: 75m direct conversion receiver for the car Post by: w8khk on May 08, 2019, 11:10:56 PM Always play it safe..... AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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