[Ground-station] In case you missed it - deviation limits measured for the MD-380

[Howie DeFelice]

I had a similar requirement for a work project. I used a RFM-69 module from Sparkfun and a CML CVSD codec operating at 16 kbps using FSK. I used a Raspberry Pi mini for control. It was overkill but made it easy to modify radio parameters on the fly in my Python script. The RFM-69 can support up to 300 kbps and has allot of flexibilty in deviation. I operated it in continuous mode verse packet mode to stream my codec data. If you think this could help let me know.

Howie AB2S

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From: Ground-Station <ground-station-bounces at lists.openresearch.institute> on behalf of Michelle Thompson via Ground-Station <ground-station at lists.openresearch.institute>
Sent: Wednesday, October 5, 2022 5:08:13 PM
To: Michelle Thompson via Ground-Station <ground-station at lists.openresearch.institute>
Subject: [Ground-station] In case you missed it - deviation limits measured for the MD-380

We wanted to see if we could use the popular HT MD-380 for Opulent Voice. Turns out the answer is no. Here's a 2 minute video on how we figured it out.

https://youtu.be/099pQf0gO_8<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2F099pQf0gO_8&data=05%7C01%7C%7Cce3e153e8ff04ebd2fa008daa715de28%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638006009602719009%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2FAlNE7Gx5MY8sixe6nZHY4NYECM32jw5TRbta6L%2FosM%3D&reserved=0>

Do you know of a commercial bit of gear that can do roughly +/-15 kHz deviation? Or more. Most digital voice HTs are limited to +/- 3 kHz.

-Michelle Thompson


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