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Re ED1ZBE
PS that is on 10368.980 mhz
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Re beacon ED1ZBE
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.
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Re: Cleaning relay contacts
Stefan
toggle quoted messageShow quoted text
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
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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
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Re: Source of feedthrough capacitors
Greetings to all!
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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.
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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!
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Re: Cleaning relay contacts
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. Andy
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.
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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
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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
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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
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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
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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
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Re: Cleaning relay contacts
Mark GM4ISM
Mike Hot switching a small DC current really does work in many cases. You generate micro-arcs at the contact surface which disrupt the oxide layer and promote a lower contact resistance Some system designs allow a few 10ms of mA DC to switch alongside the RF in service to whet the contact at each switching event I used to use special very slightly abrasive paper pulled between contacts on old (large) PO relays It was routine maintenance but even that did damage the contact surface and it was a constant battle Mechanical 'cleaning' of delicate contact surfaces as in most RF relays is a recipe for disaster. Mark GM4ISM On 28/03/2021 16:56, Mike 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
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Re: Cleaning relay contacts
Dave - G4RQI
Hello
Unless someone says otherwise you might try this http://www.dl6nci.de/sma.htm
David - G4RQI
Get
Outlook for iOS
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Mike GD6ICR <gd6icr@...>
Sent: Sunday, March 28, 2021 4:56:02 PM To: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Subject: [UKMicrowaves] Cleaning relay contacts 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
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Re: Cleaning relay contacts
toggle quoted messageShow quoted text
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
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Cleaning relay contacts
Mike GD6ICR
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
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Frequency West / Continental Microwave PLL 10m GHz Multiplier
Adrian G4UVZ
There is a well know law of electronics that if you have a fiull set of spares for an item it is very unlikely to go wrong!
During the rebuild of GB3KBQ, due to the generocity of individuals on this forum, I was able to build an 'almost' spare driver unit for the beacon. What I am missing, to complete a spare unit, is the 108 MHz - 10GHz multiplier. This is a Continental Microwave / Frequency- West Microwave PLL multiplier 'Brick' These were commonly available at round tables and rallies a few years ago. If you have such an item gathering dust and surplus to your requirements ..I can find a good home it! Adrian G4UVZ Beacon Keeper GB3KBQ 10,368.870 MHz IO80LX
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Re: Source of feedthrough capacitors
John Lambo
Hello All,
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Look on Aliexpress for this . Very cheap https://nl.aliexpress.com/item/32964132425.html?spm=a2g0o.productlist.0.0.2afc4a56MY5RcA&algo_pvid=1e89c265-ff96-4d99-a4ce-1014ad49a3b1&algo_expid=1e89c265-ff96-4d99-a4ce-1014ad49a3b1-1&btsid=2100bddb16169361206151749e0ab3&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ GL John PA7JB Op 28-3-2021 om 14:40 schreef Neil Smith G4DBN:
https://rfshop.co.uk/feedthru-tusonix-compatible-8-32-unc-thread-1500pf-ft-1500 but postage is £6.. #8-32 UNC is for a 4.2 mm hole
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Re: Source of feedthrough capacitors
Neil Smith G4DBN
https://rfshop.co.uk/feedthru-tusonix-compatible-8-32-unc-thread-1500pf-ft-1500 but postage is £6.. #8-32 UNC is for a 4.2 mm hole
CPC have some that are 5.5mm #12-28 UNF Franco Rota has some 2.9mm ones, but carriage is ludicrous unless you have other stuff to order https://www.rf-microwave.com/en/corry-micronics/ft24-01-102p/ultra-miniature-feed-through-capacitor/cp-d26 Neil G4DBN
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Re: Source of feedthrough capacitors
Keith Le Boutillier
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From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Mike GD6ICR
Anyone know of a source of small bolt in ir 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.
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