• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

R7100 clicking sound

Status
Not open for further replies.

exK3JTP

Member
Premium Subscriber
Joined
Jul 5, 2013
Messages
17
Location
Baltimore, MD
#1
I recently picked up an IC-R7100 that works fine except for an irritating random clicking inside, which I'm assuming may be the relay. I am monitoring air bands below 380 MHz, so the relay should not be closing, and the reception is not affected by the clicking. I have had several R7100s before, but I have never experienced this issue. Is it the relay that is causing the clicking and is there any way to fix it?
Les Polt
Baltimore
 

exK3JTP

Member
Premium Subscriber
Joined
Jul 5, 2013
Messages
17
Location
Baltimore, MD
#2
In reply to my own posting I came across a similar thread years ago, which duplicates my issue:The relay opens as soon as the squelch is broken and closes about 2 seconds after the squelch closes. Is there a way to lubricate the relay or minimize the noise? I have not experienced this with other R7100s.
Les Polt
 
Joined
Dec 22, 2013
Messages
3,014
#5
Years ago I was told it was caused by band switching circuits, but that was when it was heard during scanning different bands/frequencies. However I found this info below. I can not confirm.


Icom IC-R7100 and its clicking noise
https://ea4eoz.blogspot.com/2017/11/icom-ic-r7100-and-its-clicking-noise.html
It appears it would be very easy to remove the relay, replace it with an optoisolator and dropping resistor for the LED. This could be soldered on a square of perf board and fit exactly in place of the relay. The you would still have that functionality.

I used the record function to activate PTT of a small low power UHF transmitter so I could monitor remotely.

Sent from my SM-T350 using Tapatalk
 
Joined
Sep 8, 2006
Messages
3,041
Location
Stockholm, Sweden
#6
Doesn't the optoisolator need to be able to handle both high UHF frequencies and low uV levels?
I've never seen a semiconductor solution for any of those receivers that use relays to shift frequency bands.

Maybe it could be possible to source relays that are not so loud and put on a seperate board that doesn't lead the clicking sound to the chassi and perhaps wrap sound dampening material around it?

/Ubbe
 
Joined
Dec 22, 2013
Messages
3,014
#7
Doesn't the optoisolator need to be able to handle both high UHF frequencies and low uV levels?
I've never seen a semiconductor solution for any of those receivers that use relays to shift frequency bands.

Maybe it could be possible to source relays that are not so loud and put on a seperate board that doesn't lead the clicking sound to the chassi and perhaps wrap sound dampening material around it?

/Ubbe
The relay is switching DC like the remote start stop switch of an old cassette recorder. For whatever reason ICOM had no provision to disable the relay in that model and it clicks away. They could have used an optoisolator when the designed it but, maybe a relay was cheaper.

Some ICOM receivers do have bandswitch relays, my R9000 has one and I have to keep frequencies in the banks in the same range or it makes a click. Annoying.

Sent from my SM-T350 using Tapatalk
 
Status
Not open for further replies.
Top