OT: Effect of mechanical connectors & sampling units on the antenna line

[Doug Hensley]

I don't want to start a flurry of emails on this so perhaps if

you could respond privately, it will keep the list traffic down.


I began my question-subject with a curiosity on how the professional

evaluators test & report on modern transceiver performance such as

sensitivity, etc.  At the same time, I have been looking at some Elecraft

products: the W2, the P3 TXMON, and the like.  My instinct tells me

that no ultimate best figures can survive on an input line where there

are sampling units & PL-259 couplings, short lengths, PL-259 to BNC

adapters, etc.  So I'm thinking that when Sherwood Labs specs out

the K2 and the K3, they probably:


1.  Have the rig on a wet cell battery;

2.  Except for the signal generator line coming, the rig is probably inside

an EMF shielded cage, etc.

3.  The only thing going into the transceiver is a single signal cable connection.


Am I at least close to being right ?


And if so, how much degradation would I cause using, for example, both

the P3TXMON sampling unit and a W2 sampling unit between the antenna

and the K-Type receiver as well as a typical switching power supply feeding

the power?


Thanks for any responses to me in private.


Cheers,


Doug W5JV






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[Grant Youngman-2]

No …. not close.  You can talk to Rob about his tests, but that isn’t what he does.  And  any sensors between the signal generator and the radio (or your antenna and the radio) aren’t going to materially change anything about the radios performance.

How many tenths of a dB are you concerned about?  :-)

Grant NQ5T

>
>
> I began my question-subject with a curiosity on how the professional
>
> evaluators test & report on modern transceiver performance such as
>
> sensitivity, etc.  At the same time, I have been looking at some Elecraft
>
> products: the W2, the P3 TXMON, and the like.  My instinct tells me
>
> that no ultimate best figures can survive on an input line where there
>
> are sampling units & PL-259 couplings, short lengths, PL-259 to BNC
>
> adapters, etc.  So I'm thinking that when Sherwood Labs specs out
>
> the K2 and the K3, they probably:
>
>
> 1.  Have the rig on a wet cell battery;
>
> 2.  Except for the signal generator line coming, the rig is probably inside
>
> an EMF shielded cage, etc.
>
> 3.  The only thing going into the transceiver is a single signal cable connection.
>
>
> Am I at least close to being right ?
>
>

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