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Posted: 12/1/2018 2:29:44 PM EDT
[#1]
If My pea brain is working, Yes.
I would caution you to go Bosche brand. Also check eHam and QRZ to see what's been done before. You might find a easy way to build your setup. |
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Posted: 12/1/2018 2:45:41 PM EDT
[#2]
I built an antenna switching unit based on this KK1L board. It works great. You can take a look at the parts list for that.
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Posted: 12/2/2018 10:18:26 AM EDT
[#3]
What about the ham radio workbench 4 way switch kit?
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Posted: 12/2/2018 2:09:47 PM EDT
[#4]
How much power are you going to transmit through them?
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Posted: 12/2/2018 6:29:31 PM EDT
[#5]
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Posted: 12/2/2018 6:53:49 PM EDT
[#6]
Quote HistoryQuoted:
How much power are you going to transmit through them? I am going to put different taps on my wolf river coil under my fiberglass cap of my truck and change bands with a switch |
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Posted: 12/2/2018 6:54:05 PM EDT
[#7]
Quote Historynope
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Posted: 12/3/2018 3:26:43 PM EDT
[#8]
@Mach Let me look in my vast inventory over the next couple days. I have a bunch of relays all different sizes
and some are mercury wetted. |
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Posted: 12/3/2018 3:51:27 PM EDT
[#9]
Quote HistoryQuoted:
@Mach Let me look in my vast inventory over the next couple days. I have a bunch of relays all different sizes and some are mercury wetted. I picked up some 40 amp automotive relays for cheap and will see if they work. Instead of getting a motorized screw driver that would not have a good place to go on my truck, I put a coil under the fiberglass cap and a whip on top and will have 20/40/80 taps that I will select via the relays and a switch box I think it will work , but we will see. I talk to the EU and the west coast driving around town so the concept works, I just want to make it easier to change bands |
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Posted: 12/5/2018 5:04:21 PM EDT
[#10]
@Mach The only "simple" relays (spst n/o or n/c) I have are only rated at
1 amp. Probably too small for 100w. They are mercury wetted, PC board mount. |
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Posted: 12/5/2018 7:13:05 PM EDT
[#11]
If your tapped setup turns out to be anything like the loading-coil-switcher-inner-outer that I used for my 23 ft vert, then voltage standoff on low bands like 80 M is going to be the problem. I had to use a small vacuum relay to do the job at 100 watts. It arced like crazy at 200 or 300 watts.
On 40 M, voltage isn't too bad - a few hundred to several hundred volts on the output side of a loading coil. On 80 M, voltage can easily be a few to several kV, depending upon the radiator length. |
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Posted: 12/6/2018 4:36:27 AM EDT
[#12]
Quote HistoryQuoted:
@Mach The only "simple" relays (spst n/o or n/c) I have are only rated at 1 amp. Probably too small for 100w. They are mercury wetted, PC board mount. |
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Posted: 12/6/2018 4:45:39 AM EDT
[#13]
Quote HistoryQuoted:
If your tapped setup turns out to be anything like the loading-coil-switcher-inner-outer that I used for my 23 ft vert, then voltage standoff on low bands like 80 M is going to be the problem. I had to use a small vacuum relay to do the job at 100 watts. It arced like crazy at 200 or 300 watts. On 40 M, voltage isn't too bad - a few hundred to several hundred volts on the output side of a loading coil. On 80 M, voltage can easily be a few to several kV, depending upon the radiator length. I did not realize the voltage would go up with lower freq even if the tap was a good SWR match but now that I think about it the lower the band the higher the Q for same length antenna and smaller the bandwidth which will lead to increase voltage and SWR and mismatch off that single freq that the tuner has to deal with leading to high voltages on the feedline which is where the relay will be, before the coil. |
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