Date   

Re: Cleaning relay contacts

Stanislaw Ziemczonek
 

On a slightly related subject has anyone found a long lasting way to clean "contactless" key pads on things like TV remote controls which seem to rely on a resistive / capacitive button  to come into contact with a printed "electrode" on the pcb. Despite these being gold plated they seem to need frequent cleaning with IPA to ensure correct operation. I've lost count of the number of times I've had to open mine up to clean said contacts only to have them fail again a few weeks later.


Re: Cleaning relay contacts

Stefan
 


dont know, maybe there is a minute build up of oxides or similar non contactive layer build up. I seen  it throughout all of those keyboard type button, test gear sufferes equally, my HP8563e is getting worse and worse and will need previous mentioned treatment.
 
Good Luck 73

----- Original Message -----
Sent: Tuesday, March 30, 2021 7:37 AM
Subject: Re: [UKMicrowaves] Cleaning relay contacts

How come cleaning the button clears the problem for a while then?

73


Re: Good 3cm tropo IO93 to IO80

Neil Smith G4DBN
 

Weird skew paths up here, I am hearing KBQ, SCX and PKT on a beam heading somewhere between KBQ and SCX. Much stronger than the direct signals. Also seeing PKT very strong at 75 degrees off axis from the south west but almost nil direct. So weird seeing four beacons at the same time on 3cm without rainscatter.  Just found an S9+ signal from PKT off Drax chimney, looks like the duct is quite elevated this end

Neil G4DBN

On 29/03/2021 23:09, G1DFL via groups.io wrote:
If only there had been an SHF UKAC tonight!
With no permanent aerials on any bands its my once a month GHz experience!

SEE is also audible on Mow Cop SDR.

Farnham 3cm SDR is bonkers, has a massive SCX plus KBQ, PKT, LEX all stronger than SEE.

Tonight its SW enhancement, but Friday and Saturday look great to EU on the Hepburn charts.

Regards..Pete
G1DFL





On Mon, 29 Mar 2021 at 22:47, Robin Szemeti - G1YFG
Ridiculously loud on the Mow Cop SDR as well, S9+20 at times, first time I have ever heard anything other than OSW on there!   

GB3PKT is also coming through ...nice and strong.





On Mon, 29 Mar 2021 at 21:56, Neil Smith G4DBN <neil@...> wrote:
GB3KBQ is romping in here now from 340 km away, even with my dish rather
low. Anyone to my south-west fancy a quick try on Q65 or CW or phone?

I'll be on  KST for 20 mins or so

Neil G4DBN







--
Robin Szemeti - G1YFG


Re: Good 3cm tropo IO93 to IO80

G1DFL
 

If only there had been an SHF UKAC tonight!
With no permanent aerials on any bands its my once a month GHz experience!

SEE is also audible on Mow Cop SDR.

Farnham 3cm SDR is bonkers, has a massive SCX plus KBQ, PKT, LEX all stronger than SEE.

Tonight its SW enhancement, but Friday and Saturday look great to EU on the Hepburn charts.

Regards..Pete
G1DFL





On Mon, 29 Mar 2021 at 22:47, Robin Szemeti - G1YFG
<robin@...> wrote:
Ridiculously loud on the Mow Cop SDR as well, S9+20 at times, first time I have ever heard anything other than OSW on there!   

GB3PKT is also coming through ...nice and strong.

image.png



On Mon, 29 Mar 2021 at 21:56, Neil Smith G4DBN <neil@...> wrote:
GB3KBQ is romping in here now from 340 km away, even with my dish rather
low. Anyone to my south-west fancy a quick try on Q65 or CW or phone?

I'll be on  KST for 20 mins or so

Neil G4DBN







--
Robin Szemeti - G1YFG


Re: Good 3cm tropo IO93 to IO80

Robin Szemeti - G1YFG
 

Ridiculously loud on the Mow Cop SDR as well, S9+20 at times, first time I have ever heard anything other than OSW on there!   

GB3PKT is also coming through ...nice and strong.

image.png



On Mon, 29 Mar 2021 at 21:56, Neil Smith G4DBN <neil@...> wrote:
GB3KBQ is romping in here now from 340 km away, even with my dish rather
low. Anyone to my south-west fancy a quick try on Q65 or CW or phone?

I'll be on  KST for 20 mins or so

Neil G4DBN







--
Robin Szemeti - G1YFG


Re: Cleaning relay contacts

Chris G8BKE
 

How come cleaning the button clears the problem for a while then?

73


Good 3cm tropo IO93 to IO80

Neil Smith G4DBN
 

GB3KBQ is romping in here now from 340 km away, even with my dish rather low. Anyone to my south-west fancy a quick try on Q65 or CW or phone?

I'll be on  KST for 20 mins or so

Neil G4DBN


Re: SDR UNO RSP 1 Problem

Julian G1EKW
 

Hi, Adrian

I don't have that hardware, but for the issue you are describing, that almost certainly isn't relevant. I've just installed SDRuno on a Windows 10 box to test this, noted the registry entries created and folders/files also. going to settings/apps, I see four apps registered (I'll try to attach the screenshot - never tried that in here yet). Click the first one then uninstall. Now the list will update. Again click what is now the top of the list and uninstall. When that completes (it's fairly quick) all four apps will have disappeared. At that point I checked for rogue Registry entries but found nothing significant and no sign of leftover config/INI files.

 

I hope this helps. Things may not work like this if the hardware is still atached as it may prevent the drivers from being removed but as I said, I can only test the software side at the moment, so YMMV.

 

Regards,

Julian (G1EKW)


Re ED1ZBE

Dave
 

PS that is on 10368.980 mhz


Re beacon ED1ZBE

Dave
 

I can get my laptop to work so can’t use beaconspot but am receiving ED1ZBE 579 on Haytor is anyone is interested.
Dave G4GLT.


Re: Cleaning relay contacts

Stefan
 


Hi Chris
 
it is the button that is the problem, not the PCB, the minute carbon deposits wears off. You can buy pure silverpaint that has a hydrocarbon glue,
specially made to repair tracks and keyboard buttons.
Alternative if you want to go cheap use super glue and aluminium kitchen foil and adhere it to the button.
 
VK4CSD Stefan 73

----- Original Message -----
Sent: Monday, March 29, 2021 7:02 PM
Subject: Re: [UKMicrowaves] Cleaning relay contacts

On a slightly related subject has anyone found a long lasting way to clean "contactless" key pads on things like TV remote controls which seem to rely on a resistive / capacitive button  to come into contact with a printed "electrode" on the pcb. Despite these being gold plated they seem to need frequent cleaning with IPA to ensure correct operation. I've lost count of the number of times I've had to open mine up to clean said contacts only to have them fail again a few weeks later.

73


Re: Cleaning relay contacts

Chris G8BKE
 

On a slightly related subject has anyone found a long lasting way to clean "contactless" key pads on things like TV remote controls which seem to rely on a resistive / capacitive button  to come into contact with a printed "electrode" on the pcb. Despite these being gold plated they seem to need frequent cleaning with IPA to ensure correct operation. I've lost count of the number of times I've had to open mine up to clean said contacts only to have them fail again a few weeks later.

73


Re: Source of feedthrough capacitors

DougF VK4OE
 

Greetings to all!

There are many relatively small ones waiting to be 'recovered' from each Elcom Synth, a previously valued microwave module which now seems to have fallen out of popular use (particularly in that their sources seem to have dried up).  I suspect that there are still many of these modules still sitting on readers' shelves, just waiting for a suitable project to come along!

Cheers and 73,

--Doug Friend, VK4OE

On 28/03/2021 10:21 pm, Mike GD6ICR wrote:
Anyone know of a source of small bolt in or solder in feed through capacitors. 3-4mm diameter max as I want to externalize some control pins on two transverters I have. All the ones Ive seen on Ebay/Banggood/Farnell etc all seem to be much larger 6mm size. Any advice/source appreciated.
Mike GD6ICR IO74PF73TW


Re: SDR UNO RSP 1 Problem

Dave (G1OGY)
 

>> I have a problem with my RSP 1 .

You need to take a look at ::

C:\Users\<Your-User-Name>\AppData\Roaming\SDRPlay\SDRuno.ini

It is a text file and will open in `Notepad`.
It may well be advisable to delete it; given you want an OOB experience.

Dave, G1OGY


On Sun, 28 Mar 2021 at 18:19, Adrian G4UVZ via groups.io <adrianwhatmore248=btinternet.com@groups.io> wrote:
Thanks Andrew ...Registry sounds dangerous ..with my limitted IT Skils!!   I foresee the blue screen of death on the horizon!

A


Re: Cleaning relay contacts

Andy G4JNT
 

I see an intelligent relay rejuvenation project in this.   Swap over the contacts repeatedly, with a constant current driven though each.   Monitor the voltage drop after each change to a make position and report the findings.



On Sun, 28 Mar 2021 at 19:42, Alan Melia via groups.io <Alan.Melia=btinternet.com@groups.io> wrote:
Mark beat me to it :-((  I was getting a number of Pye/Philips M290 relays going HR on receive contacts in the 1990s. This was not a coax relay but switching a few milliamps several times returned the receive sensitivity without needing to replace the relay (an RS stock item).   I believe it was a BT method in the days of Strowger.

Alan
G3NYK






Re: Cleaning relay contacts

Alan Melia
 

Mark beat me to it :-(( I was getting a number of Pye/Philips M290 relays going HR on receive contacts in the 1990s. This was not a coax relay but switching a few milliamps several times returned the receive sensitivity without needing to replace the relay (an RS stock item). I believe it was a BT method in the days of Strowger.

Alan
G3NYK


Re: Cleaning relay contacts

John Fell
 

Clamp gently in a vice onto the lid and whack the base with a small lump of wood - should break the epoxy seal and allow cover to come off .
Contacts can be seen and if appropriate cleaned with a contact strip - do not file !
Test results on a SAnn.
DC Wetting is useful , mainly on the RX contacts that are often NC for long periods and develop surface resistance .

73
JOhn
G0API

On Sun, 28 Mar 2021 at 16:56, Mike GD6ICR <gd6icr@...> wrote:
Been going through my sma relays and testing them on my primitive spectrum analyser has shown that I have quite a few lossy relay on TX as high as 4dB and quite a few showing around 1dB on RX side. I wonder if anyone can suggest a suitable contact cleaning method - one suggestion Ive had is connect 12v thru 500ohm resistors to NO and NC and leave them switching for about 5 minutes

Some of the relays of coarse can be dismantled and cleaned but most cannot - any comments please
--
Mike GD6ICR IO74PF73TW


Re: Cleaning relay contacts

Mike GD6ICR
 

Thanks Mark Im aiming in the switching DC on the contacts as per http://www.dl6nci.de/sma.htm Thanks to Dave RQI for this - its really good design especially 24/12v relays

Circuit building tomorrow
 

--
Mike GD6ICR IO74PF73TW


Re: SDR UNO RSP 1 Problem

Adrian G4UVZ
 

Thanks Andrew ...Registry sounds dangerous ..with my limitted IT Skils!!   I foresee the blue screen of death on the horizon!

A


Re: SDR UNO RSP 1 Problem

Andrew G8TZJ
 

Many programs store their data in the registry. Its quite likely the RSP 1 also does. So the only way is to look through the registry with regedit.exe (search for key words) and delete as necessary. BEWARE! Editing the wrong thing in the registry could lead to nasty things happening. Make a backup of the registry first and then its fingers crossed.

73 Andrew G8TZJ

2581 - 2600 of 64307