why would a calculator have an antenna circuit? w/ pics

[wenzeslaus]

I was replacing the battery in a calculator.

wait a minute, it's got an antenna circuit in it?

diode, capacitor, "RF"

why would a calculator have an antenna circuit?

anybody got an explanation?

 

[FKimble]

A "spy" calculator maybe?

Frank

 

[frazpo]

No explanation but where does the battery go? lol

 

[fxdscon]

No explanation but where does the battery go? lol

Solar powered?...

 

[HandiScratchy]

I couldn't find a description of this model online. Does it have a date/time display that uses the atomic clock?

 

[nd5y]

RF could mean something else besides radio frequency.

 

[frazpo]

Solar powered?...

View attachment 147843

Ya that was my point. He stated he was replacing the battery. lol. I like posts like this. There's even more of an underlying mystery. It's almost 1 am and the OP is "changing a battery" in a 1980's solar calculator.

 

[fxdscon]

Ya that was my point. He stated he was replacing the battery. lol. I like posts like this. There's even more of an underlying mystery. It's almost 1 am and the OP is "changing a battery" in a 1980's solar calculator.

This describes a button cell, maybe just out of sight at the top of his 2nd pic?

DATEXX DH-245 CALCULATOR USER MANUAL

View and Download Datexx DH-245 user manual online. Pocket Calculator. DH-245 calculator pdf manual download.

www.manualslib.com

 

[eorange]

RF could mean something else besides radio frequency.

Exactly. RF here means "reciprocal fraction", which everyone knows requires at least 1 diode to calculate.

 

[frazpo]

This describes a button cell, maybe just out of sight at the top of his 2nd pic?

DATEXX DH-245 CALCULATOR USER MANUAL

View and Download Datexx DH-245 user manual online. Pocket Calculator. DH-245 calculator pdf manual download.

www.manualslib.com

Yep, looks like it. Didnt know you could still even buy these old things.