[TMC] AMC-32 question

[John Vendely]

Hi Bob,

It is kinda surprising that TMC didn't specify an input damage level for 
these multicouplers.  But there is a gain compression spec which implies 
the coupler should be in no more than about 3 dB gain compression with 
an 8V p-p signal applied--a whopping big signal into 50 ohms.  So we're 
probably safe in assuming that the input damage level is somewhere well 
above that.

TMC also sold their antenna multicouplers for use as frequency reference 
distribution amplifiers, and an output level of 1 VRMS would be typical 
in this application.

I have several AMC series multicouplers in use on receiving antennas in 
moderately close proximity to transmitting antennas, and have never had 
one fail.  However, these multicouplers, when sufficiently overdriven, 
could possibly develop output power exceeding the input damage level of 
many solid-state receivers...

73,

John K9WT

On 2/3/2022 4:57 PM, Robert Nickels wrote:
> The AMC-32 is a 32-output HF receive multicoupler made by TMC Canada. 
> The manual doesn't specify a maximum input voltage that can be 
> tolerated, but in any location with transmitting antennas present 
> there will be substantial RF present on receiving antennas and I 
> wonder if any knows or might offer a guess as to what the maximum 
> input voltage is.
>
> I realize in actual use the receivers would likely have preselectors 
> but in my case I just want to avoid unintentional damage.
>
> Thanks and 73,
>
> Bob W9RAN
>
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