¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. Ldgelectronics
  2. Messages
Single Messages Topics Expanded Polls

Re: RT100/RC100 ISSUE

 

¿ªÔÆÌåÓý

Hey Charlie,

In a commercially produced item, it was probably implemented to preclude you from doing exactly what you were doing. ??

Mil - Spec coating would not chip off in bits; No better word to use, it is dry but not brittle, sort of a semi-cured coating which is a certified B!tch?to remove.

Dave WA4WX

From: [email protected] <[email protected]> on behalf of Charlie N2MHS via groups.io <ucfargis1@...>
Date: Sunday, April 20, 2025 at 09:23
To: [email protected] <[email protected]>
Subject: Re: [ldgelectronics] RT100/RC100 ISSUE

A guy once gave me conformal coated over the air subscription TV box to reverse engineer
I could see the board edge throught the coating
I whacked it using a tiney Excelite flat blade screwdriver as a chisel.
Bing chunks flew off.
Easily figured it out, ground off a control path and it decoded all the time.
Poor design.

On Sunday, April 20, 2025 at 08:42:39 AM EDT, David Hamm via groups.io <cs30imagine@...> wrote:


On conformal coatings¡­.

This process is normally used in critical Military gear, although not in the latest generation of COTS equipment.

It renders any repair much more difficult. ?Careful removal is required using special solvents, and any residual coating will complicate soldering with quality. ?Then, one would have to repair or ¡°re-coat¡± with an identical coating to complete.

It also complicates determining component values and obscures their marking.

If this inexpensive device was designed to be submersible, a different watertight enclosure would be warranted. ?In short, driving up costs and rendering the device disposable after failure.

In understanding any design at this point, we must consider cost. ?That is how the world operates now. ?Design centers around a price point. ?Secondary environmental protection is good, using inexpensive plastic items of all sorts.

Can¡¯t speak to the lack of a weep hole, but easily fixed with a small drill bit. ?Not too large, or you will find the item filled with ants or other insects.

Dave WA4WX

From: [email protected] <[email protected]> on behalf of John via groups.io <ve3kkqve3kkq@...>
Date: Saturday, April 19, 2025 at 18:07
To: [email protected] <[email protected]>
Subject: Re: [ldgelectronics] RT100/RC100 ISSUE

After the warranty has expired, how about coating both sides of the PCB with conformal coating?

John
VE7KKQ

On Sat, Apr 19, 2025 at 3:06?PM But Wheat via ?<kx8xx=[email protected]> wrote:

Speaking of conformal coating,?

wow, lots to unpack there.?

Before I put out another 3 remote antenna couplers this year I want to further understand these coatings.

Separate thread discussion anyone??

Mark kx8xx ??



-------- Original message --------
From: "Dave Robinson via " <kb7gp=[email protected]>
Date: 4/18/25 17:58 (GMT-05:00)
To: [email protected]
Subject: Re: [ldgelectronics] RT100/RC100 ISSUE

I don't want this issue to reappear.
?
I am not sure how water got in... I have the equipment securely mounted on the side of a sturdy post, with its connections pointing downward to prevent any potential water ingress. Despite the absence of flooding, the weather was particularly harsh, characterized by heavy rain and fierce winds.?
?
Inside the unit, I was struck by the conspicuous absence of a conformal coating¡ªa vital protective layer I deem essential for any equipment expected to endure the punishing elements. While the utility case appeared reasonably well-sealed, the lack of this protective feature raised concerns about the device's long-term durability. Furthermore, I noticed the absence of other elements, such as a weep-hole to help keep humidity buildup in check.
Join [email protected] to automatically receive all group messages.