Author Topic: What's this doohickey? It's a 61A interference filter  (Read 337 times)

Offline Devansphones

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What's this doohickey? It's a 61A interference filter
« on: April 03, 2019, 09:33:45 PM »
I received a project D1 in the mail this afternoon. I'm doing some exploring, wondering what this little guy is? (Circled in blue) I've never seen it before.
~Devan

Offline rdelius

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Re: What's this doohickey? It's a 61A interference filter
« Reply #1 on: April 03, 2019, 09:43:39 PM »
A dial pulse spark surpressor

Offline Devansphones

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Re: What's this doohickey? It's a 61A interference filter
« Reply #2 on: April 04, 2019, 11:11:18 AM »
Hmmmmm interesting.
~Devan

Offline Key2871

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Re: What's this doohickey? It's a 61A interference filter
« Reply #3 on: April 04, 2019, 12:16:19 PM »
That was referred to as a filter. I'm not sure but I think it was something to do with the service for the customer.
KEN

Offline Doug Rose

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  • Blondie & the Kid of Phone
Re: What's this doohickey? It's a 61A interference filter
« Reply #4 on: April 04, 2019, 01:09:22 PM »
I always thought it was a radio frequency filter to block out radio stations broadcasting on your phone
Kidphone

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Re: What's this doohickey? It's a 61A interference filter
« Reply #5 on: April 04, 2019, 01:49:30 PM »

Offline rdelius

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Re: What's this doohickey? It's a 61A interference filter
« Reply #6 on: April 04, 2019, 04:33:11 PM »
The RFI surpressor is the small capacator across the transmitter capsules on E1 and F1 handsets . This is so radio signals are not detected and heard in the receiver. The filter on the dial prevents sparks that can cause interference to radio sets (popping)