DIYbanter - View Single Post - Harman Kardon 930 lost channel. Hoe to trouble shoot ?

Phil Hobbs

On 10/12/2018 03:19 PM, wrote:
On Friday, October 12, 2018 at 9:24:31 AM UTC-4, Phil Hobbs wrote:

Providing that the thermal infrared emissivity of the surface is high,
e.g. plastic or glass. A dab of grease or some tape will make it work a
lot better.

I have not experienced that issue, for the record. What I find is that accuracy starts to suffer as the battery gets weak. I view them the same as smoke-alarm batteries - 2x per year, whether I need it or not. And the used batteries are put aside for my increasing number of novelty radios that the grandkids are fighting over. Not in them, but with them for demonstration purposes.

Your accuracy requirements aren't high, then. A shiny metal surface can
easily show up as 90% room reflection and 10% surface emission. A bit
of tape will reverse those numbers.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
https://hobbs-eo.com