From: "Gerry" 
Subject: RE: [drakelist] TR-7 Receiver Noise


"Gerry"  made an utterence to the
drakelist gang
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A slight amount of AC hum can be heard in the TR-7 because the AC line is
brought in to the ON/OFF switch. As I said it is very low noise of little
consequence. If you can try the TR-7 with another DC supply or battery. If
no noise, then you know where it came from.

-----Original Message-----
From: owner-drakelist{at}www.zerobeat.net
[mailto:owner-drakelist{at}www.zerobeat.net] On Behalf Of Carel, PA0CMU
Sent: Wednesday, December 08, 2004 9:44 AM
To: drakelist{at}www.zerobeat.net
Subject: RE: [drakelist] TR-7 Receiver Noise


"Carel, PA0CMU"  made an utterence to
the drakelist gang
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Hello Vic,

It might be the powerline wiring from the on/off switch on the front panel 
to the connector on the rear panel. The 60 Hz /110V signal introduces a hum 
in the audio circuits.
We modified the PS-7 by mounting a switch on the frontpanel and disabled the

original on/off switching. Due to that, the PA fan must be replaced too. We 
used a cheap 12V computer fan. Now you can use your TR7 with forced cooling 
in the field too!

73, Carel - PA0CMU.

>From: vmilam{at}att.net
>To: drakelist{at}www.zerobeat.net
>Subject: [drakelist] TR-7 Receiver Noise
>Date: Tue, 07 Dec 2004 16:04:27 +0000
>
>vmilam{at}att.net made an utterence to the drakelist gang
>----------------------------------------------------------------------
>Greetings.
>I recently put a TR-7 on the air that I purchased several months ago. All 
>is fine except that there is what I can best describe as a low frequency 
>"rumble" noise that is most noticable when using headphones.
It is very 
>audible even with the RF gain set to max and the audio gain set to min. I 
>have listed with another receiver and do not hear this noise, so I don't 
>think I have any interference in the shack.
>When tuning in signals, there does not appear to be any distortion, but the

>background noise is very noticable.
>Any suggestions greatly appreciated.
>Vic K5TAG
>----------------------------------------------------------------------
>On Behalf of vmilam{at}att.net
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On Behalf of "Carel, PA0CMU" 
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On Behalf of "Gerry" 
Submissions:        drakelist{at}www.zerobeat.net
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Zerobeat Web Page:  http://www.zerobeat.net
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
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