I nice to get all exercised over gaps and diodes but most lightening damage is
through ground loops and the lightening entering the AC seeking its way to
ground. In other words this incident my have been less related to stuff on the
wire than IC-1 acting as fuse in a ground loop path,
I have had my SDR for about 6 months now and last night night it was subjected
to a static discharge during a thunderstorm. Not a direct hit but enough to
affect the receiver. Now it has very low sensitivity. Are there any known
causes for this (blown diodes or RF amp transistor in the front
Frank,
My best guess is the preamplifier on the RFE-board. Unless the
schematic diagram is not recently updated, there are protection diodes
(1N4148) before the input capacitor (C47) of the amplifier, so maybe
they are broken, too. You possibly can repair it yourself. See these
ECOs for help:
Sorry, my memory made me a trick. The protection diodes are not shown
in the original schematic. They are shown only in the ECO001 and
ECO025.
Please, FlexRadio, update and publish the schematic diagrams of the SDR-1000.
73, Ahti OH2RZ
On 17/05/07, Ahti Aintila [EMAIL PROTECTED] wrote:
Frank,
Thanks guys. I'll check it out today!
- Original Message -
From: Ahti Aintila
To: Frank Mayer
Cc: flexradio@flex-radio.biz
Sent: Thursday, May 17, 2007 4:29 AM
Subject: Re: [Flexradio] Low recieve
Frank,
My best guess is the preamplifier on the RFE-board. Unless
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED] ; Frank Mayer ; flexradio@flex-radio.biz
Sent: Thursday, May 17, 2007 5:54 AM
Subject: RE: [Flexradio] Low recieve
It might be usefull to check if the relay contacts on the input of the RF
preamp
are still OK
PROTECTED]
Sent: Thursday, May 17, 2007 10:58 AM
To: flexradio@flex-radio.biz
Subject: Re: [Flexradio] Low recieve
Re: [Flexradio] Low recieveI called Ken at Flex and he referred me to Ed at
Flex service and he walked me thru the RFE board and we determined that the RF
amp IC was bad
stack of the SDR1000 for repair.
gl de SM6OMH
Willi
- Original Message -
From: Frank Mayer [EMAIL PROTECTED]
To: flexradio@flex-radio.biz
Sent: Thursday, May 17, 2007 12:35 AM
Subject: [Flexradio] Low recieve
I have had my SDR for about 6 months now and last night night
be the right opportunity to install one of these when you unpile the
board stack of the SDR1000 for repair.
gl de SM6OMH
Willi
- Original Message -
From: Frank Mayer [EMAIL PROTECTED]
To: flexradio@flex-radio.biz
Sent: Thursday, May 17, 2007 12:35 AM
Subject: [Flexradio] Low
! Great radio! You gotta love it!
Thanks guys!
Frank, WA3JBT
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED] ; Frank Mayer ; flexradio@flex-radio.biz
Sent: Thursday, May 17, 2007 5:54 AM
Subject: RE: [Flexradio] Low recieve
It might be usefull
, 2007 11:22 AM
Subject: Re: [Flexradio] Low recieve
Willi and Frank,
The DC Spark-Over Voltage of SA05-C-T52-A-301-M is specified 200V±20%
and typically the max. device voltage of the preamps is as low as
5-6V. A properly located microgap surge absorber may prevent big
disasters, but still
; flexradio@flex-radio.biz
Sent: Thursday, May 17, 2007 3:44 PM
Subject: Re: [Flexradio] Low recieve
Ahti and Frank,
Sorry, I did not mention that I installed the microgap absorber between
antenna input of the RFE board and said voltage transients protective diode
on the RFE board. I
At 12:44 PM 5/17/2007, Willi Reppel wrote:
Ahti and Frank,
Sorry, I did not mention that I installed the microgap absorber between
antenna input of the RFE board and said voltage transients protective diode
on the RFE board. I think nowadays new SDR1000 are already equipped with
these diodes
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