[TowerTalk] WTB Top Ten Devices A/B Station Selectors

[Lux, Jim]

On 2/6/22 11:25 AM, Randy Farmer wrote:
> Yikes! And also very wrong. I moved the decimal point! Make that -0.16 
> dB and -0.35 dB. Sorry about that.


That makes a whole lot more sense.  1.6 dB (~20%) loss on 160m would be 
enormous <grin>

>
> 73...
> Randy, W8FN
>
> On 2/6/2022 1:08 PM, Lux, Jim wrote:
>> On 2/6/22 9:27 AM, Randy Farmer wrote:
>>> Strange. I've got loads of them in many places in my station antenna 
>>> switching and have never had a problem. Since I recently acquired a 
>>> new NanoVNA-F and have three spare Top Ten A/B selectors, I decided 
>>> to measure them all. I won't quote all the measurement results, but 
>>> I will summarize.
>>>
>>> 1. Over the range of 1.5 MHz to 54 MHz, the insertion loss of a 
>>> selected port went from about -1.6 dB worst case at 1.5 MHz to about 
>>> -0.35 dB worst case at 54 MHz. The insertion loss curve (S21) was 
>>> monotonic over the range.
>>
>> It's interesting that the loss goes *down* as the frequency goes up.
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