[Amps] Vacuum Relay Question

Jim jimw7ry at gmail.com
Wed Jul 28 21:50:11 EDT 2021


Oh dear!  That sucks Alek!   But glad you were able to find the parts to 
fix it.

73

Thanks
73
Jim W7RY

On 7/28/2021 7:49 AM, Aleksandar Petkovic wrote:
> Yes, I did. . . . . . After the fact.😁😁
>
> I had it strike from within in one of my amplifiers a couple of months 
> ago. A failed vacuum relay in the output resulted in the loading wafer 
> of the bandswitch getting a direct hit of 'lightning from within."
>
> Luckily I was able to get a spare wafer. The replacement process is 
> not going to be much fun.
>
> 73, Alek., VK6APK
>
> PS: I wasn't using the W7RY QSK.😁
>
>
> On 28/07/2021 7:33 pm, Jim wrote:
>> And specifically lightning causing issues.
>> So there's that...
>>
>> Did you see the smiley face at the end of my statement?  Perhaps not....
>>
>>
>> Thanks
>> 73
>> Jim W7RY
>>
>> On 7/28/2021 1:31 AM, Aleksandar Petkovic wrote:
>>> The discussion pertained to relay connections in the matching 
>>> network for a HF vertical antenna.
>>>
>>> 73, Alek, VK6APK
>>>
>>> On 28/07/2021 7:07 am, Jim wrote:
>>>> But there is no lightning inside of an amplifier... Hopefully. :)
>>>>
>>>>
>>>> Thanks
>>>> 73
>>>> Jim W7RY
>>>>
>>>> On 7/26/2021 12:59 PM, Jim Brown wrote:
>>>>> I don't understand this concern. Vacuum relays have been widely 
>>>>> used for decades for antenna switching in power amps, where the 
>>>>> impedance, and thus voltage and current, are the same as for this 
>>>>> application.
>>>>>
>>>>> What am I missing?
>>>>>
>>>>> 73, Jim K9YC
>>>>>
>>>>> On 7/26/2021 3:08 AM, Rob Atkinson wrote:
>>>>>> I would not use a vacuum relay in a matching network for a 1/4 w.
>>>>>> antenna.   That's a low v. high current setup calling for open frame
>>>>>> contactors or at least large open relays.  Perhaps this information
>>>>>> will render your question moot.
>>>>>
>>>>>
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