[TMC] AMC-32 question

[W2HX]

A local ham here, N2DVQ, used to work for TMC and worked on the AMC-8 (which I have) and some others. It was his first job and his first assignment with TMC was to open up the transistors used in these AMCs and find out why they were failing at such a high rate. Heat is also an issue with these (as Bob suggested).

I have two AMC-8s and two CU-1280/FRD-10  (Or is it FLR-9s?) 32 port multicouplers.  

73 Eugene W2HX
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-----Original Message-----
From: tmc-bounces at mailman.qth.net <tmc-bounces at mailman.qth.net> On Behalf Of John Vendely
Sent: Thursday, February 3, 2022 5:49 PM
To: tmc at mailman.qth.net
Subject: Re: [TMC] AMC-32 question

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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