Front end protection
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Why is it that no manufacturer has created a field replaceable front end
protection scheme? Many of us are using multiple radios or in Multiop situations. Stuff happens. In the case of the K3, D25 which we think has gone bad for whatever reason in my radio is a surface mount diode that cost essentially nothing but is not easily replaced. Why? Is there no way to provide an easier user replaceable part or a cost effective protection circuit board that would be field replaceable? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Mile,
Google Buss "Picofuse". Cushman two-way radio test equipment used to use them as protection from the inevitable uh-oh's. Very small, plug-in with special screw-capped shielded holder. Might be applicable. 73 Ken - K0PP On Feb 21, 2017 07:23, "W0MU Mike Fatchett" <[hidden email]> wrote: > Why is it that no manufacturer has created a field replaceable front end > protection scheme? Many of us are using multiple radios or in Multiop > situations. Stuff happens. > > In the case of the K3, D25 which we think has gone bad for whatever reason > in my radio is a surface mount diode that cost essentially nothing but is > not easily replaced. Why? Is there no way to provide an easier user > replaceable part or a cost effective protection circuit board that would be > field replaceable? > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Ken,
you mean these one? https://www.fusesunlimited.com/data_sheets.aspx#PICO 73 - Petr, OK1RP
73 - Petr, OK1RP
"Apple & Elecraft freak" B:http://ok1rp.blogspot.com MeWe: https://bit.ly/2HGPoDx MeWe: https://bit.ly/2FmwvDt |
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In reply to this post by Ken G Kopp
Receiver protectors have been around for a long time. Drake offered one
for its line. It had to be installed at the front end of the receive channel, which for most transceivers like the TR-7 required inside after the antenna T R switch or relay. 73 Bob W7AVK On 2/21/2017 6:33 AM, Ken G Kopp wrote: > Mile, > > Google Buss "Picofuse". Cushman two-way radio test equipment used to use > them as protection from the inevitable uh-oh's. Very small, plug-in with > special screw-capped shielded holder. Might be applicable. > > 73 > > Ken - K0PP > > On Feb 21, 2017 07:23, "W0MU Mike Fatchett" <[hidden email]> wrote: > >> Why is it that no manufacturer has created a field replaceable front end >> protection scheme? Many of us are using multiple radios or in Multiop >> situations. Stuff happens. >> >> In the case of the K3, D25 which we think has gone bad for whatever reason >> in my radio is a surface mount diode that cost essentially nothing but is >> not easily replaced. Why? Is there no way to provide an easier user >> replaceable part or a cost effective protection circuit board that would be >> field replaceable? >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by w0mu
On 2/21/2017 6:21 AM, W0MU Mike Fatchett wrote:
> Why is it that no manufacturer has created a field replaceable front end > protection scheme? Many of us are using multiple radios or in Multiop > situations. Stuff happens. This has been discussed at length in the SDR groups. Upon many recommendations, I invested in a DX Engineering DXE-RG-5000 Receiver Guard to protect my SDR (SDRPlay 2). It is a small box with BNC input and output connectors. It is rated for 500 kHz - 150 MHz and clamps the received signal to 0 dBm, well within the specs of any modern receiver front end. Note, however, that it cannot pass any transmit-level RF and there are copious warnings to not transmit through the device. It requires either a separate receive antenna, a separate T/R controlled antenna switch, or a rig that has RX-ANT-IN an RX-ANT-OUT capability. The instruction manual has many diagrams covering each of those situations. (I am not associated with DX Engineering, just a satisfied customer.) 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by w0mu
Most everyone missed the point.
Why in the K3 is there not an easy way to replace the damaged protection diode or any radio for that matter. This would seem like a common failure point for many people using 2nd rigs, dxpeditions, etc. Maybe it is not practical in the actual sense? I don't want to drag more stuff around. If would seem to me that providing a field replaceable item on the radio would not be that difficult. Maybe it is? W0MU On 2/21/2017 8:21 AM, W0MU Mike Fatchett wrote: > Why is it that no manufacturer has created a field replaceable front > end protection scheme? Many of us are using multiple radios or in > Multiop situations. Stuff happens. > > In the case of the K3, D25 which we think has gone bad for whatever > reason in my radio is a surface mount diode that cost essentially > nothing but is not easily replaced. Why? Is there no way to provide > an easier user replaceable part or a cost effective protection circuit > board that would be field replaceable? > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by w0mu
I replaced that diode in my K3 with instructions from an Elecraft technican-person. I also at the point purchased bandpass filters so that I didn't have to worry about that happening again.
In fact, all repairs and some mods to my first and early K3 were done by me with Elecraft assistance until I sent the radio back to get the new synthesizers and repair a problem that turned out to be a nick on a trace that disabled the sensor for the PA fan....that problem must have happened when I moved and the radio got some rough handling. I didn't even notice the problem until I started using more than 50 watts output. The replacement of the diode isn't difficult even if you didn't build your K3. My K3 was factory built. The tech-guys that tell you exactly what to do is a novel approach to service that has worked well for me. 73, Will, wj9b CWops #1085 CWA Advisor levels II and III http://cwops.org/ -------------------------------------------- On Tue, 2/21/17, W0MU Mike Fatchett <[hidden email]> wrote: Subject: Re: [Elecraft] Front end protection To: [hidden email] Date: Tuesday, February 21, 2017, 5:34 PM Most everyone missed the point. Why in the K3 is there not an easy way to replace the damaged protection diode or any radio for that matter. This would seem like a common failure point for many people using 2nd rigs, dxpeditions, etc. Maybe it is not practical in the actual sense? I don't want to drag more stuff around. If would seem to me that providing a field replaceable item on the radio would not be that difficult. Maybe it is? W0MU On 2/21/2017 8:21 AM, W0MU Mike Fatchett wrote: > Why is it that no manufacturer has created a field replaceable front > end protection scheme? Many of us are using multiple radios or in > Multiop situations. Stuff happens. > > In the case of the K3, D25 which we think has gone bad for whatever > reason in my radio is a surface mount diode that cost essentially > nothing but is not easily replaced. Why? Is there no way to provide > an easier user replaceable part or a cost effective protection circuit > board that would be field replaceable? > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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