Re: Frequency counters
The sensitivity is often 100mV or worse, but this device shouldn't load the output too much if it's taken across the 1K pot. And the signal level quoted for the TE-20D is 100mV! You might be OK.
The loading effect is much more noticeable if you try to "sniff" the local oscillator on a comms receiver. then the loading can change the frequency. For my HRO I had to be careful to place a pickup cable near enough to the grid cap to get a good signal, but not too close to cause frequency shift.
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