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75m direct conversion receiver for the car




 
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Author Topic: 75m direct conversion receiver for the car  (Read 673 times)
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ka1tdq
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« 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

Jon


* 75m DC receiver.jpg (3858.71 KB, 4032x3024 - viewed 156 times.)

* 75m rx car.jpg (2565.39 KB, 3563x2673 - viewed 140 times.)

* car antenna.jpg (821.16 KB, 2016x1512 - viewed 129 times.)
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Just follow the instructions, more or less.
http://www.ka1tdq.radio
WA2SQQ
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« Reply #1 on: April 23, 2019, 10:07:22 AM »

Interesting idea - nice box!
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ka1tdq
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« Reply #2 on: April 23, 2019, 07:18:02 PM »

Makes for a busy passenger seat.

Jon


* B6FD7826-B2B0-494C-B417-3A5D267134AF.jpeg (4168.49 KB, 4032x3024 - viewed 116 times.)
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Just follow the instructions, more or less.
http://www.ka1tdq.radio
W2JBL
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« Reply #3 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.
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ka1tdq
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« Reply #4 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
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http://www.ka1tdq.radio
KD6VXI
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Making AM GREAT Again!


« Reply #5 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
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w8khk
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« Reply #6 on: May 08, 2019, 11:10:56 PM »

Always play it safe.....


* buckle.jpg (27.87 KB, 509x496 - viewed 64 times.)
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Rick / W8KHK  ex WB2HKX, WB4GNR
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