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Author Topic: Ten Tec Argonaut V sensitivity---  (Read 963 times)
VE3GNU
Member

Posts: 86




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« on: January 22, 2014, 03:12:04 PM »

Looking for some guidance and input from anyone who also has struggled with the receiver 'noise' on this radio----e.g. as there is no RF Gain control---i.e. whatever prompted that particular decision?

Sure----anyone can down the available 'Attenuator', but that still does not allow me to improve the 'signal to noise' ratio!

I have read that some folks have 'opened the hood' and turned down the RF Sensitivity pot, and I am wondering if that is a good idea.  Furthermore, I have contacted the company and asked:  'Is there any adjustment inside the radio that I could access to turn down the RF?"
And the response was: 'No, there is not.'

So---what to do?  Does adjusting the RF sensitivity pot have a negative effect on the radio's ultimate performance---other than reducing the RF Gain?


This is a wonderful radio, but leaving out an RF Gain control was a major blunder---IMHO!

Thanks in advance---

Ernie
VE3GNU
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WD8KNI
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Posts: 149




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« Reply #1 on: January 22, 2014, 08:18:33 PM »

when you say receiver noise, are you talking about noise generated inside the radio, or noise coming from the antenna?..  This is a 2002 designed TenTec rig the internal receiver noise should be very low..  if the radio is not quiet with the antenna disconnected, you have a rig problem.. please clarify..

pushing the attenuator button should have the same effect as reducing the RF Gain inside..  does that reduce the noise, or is your noise noise floor..  above 20db...?

Fred
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WB2WIK
Member

Posts: 20613




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« Reply #2 on: January 24, 2014, 11:25:29 AM »

I've used the Argo V lots of times.  Why would you want to turn down the RF gain?

It has no "front end" (RF preamp) at all, the input signal goes to a balanced mixer made of two FETs which are extremely difficult to overload and the IF amplifier is gain controlled by PIN diodes in the AGC circuit.  It's a really good design.

I can't imagine what turning down the gain would do other than make the S-meter read funny.
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