[hpsdr] Penelope - no RF

[Gerd Loch]

Peter,

Are jumpers JP2 and JP3 set as described in the manual?
Did you measure the real output at the antenna connector?
Maybe the amplifier OPA2674 is dead. I often have repaired this defect.

Gerd, DJ8AY
 

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Betreff: Hpsdr Digest, Vol 72, Issue 26

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Today's Topics:

   1. Penelope - no RF (Peter Schrader)


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Message: 1
Date: Mon, 27 Feb 2012 09:28:23 +1000
From: Peter Schrader <lists at rumpleteazer.net>
To: hpsdr at lists.openhpsdr.org
Subject: [hpsdr] Penelope - no RF
Message-ID: <4F4AC017.5050303 at rumpleteazer.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi there,

I have been chasing my tail for a number of weeks now.  I have a 
Penelope that refuses to produce any power, first thing was to fix the 
T2 orientation, install Pennywhistle (separately tested) then eagerly 
waited for Alex to arrive.

Still no indication of RF in PowerSDR using TUN or MOX (AM/FM).  The 
per-band transmit settings have been configured as per the instructions.

With 100% drive selected, I see about 100mV (p-p) on R17 (DAC output), 
thanks to a nearby operator with a HPSDR this seems to be a little low 
(he reports about 1V (p-p) from the DAC, with a corresponding higher 
output from the opamp feeding the BNC jack).  My wattmeter does register 
any power from the output jack, I do see a small signal with the CRO 
though (amplified OK by the opamp).

All supply rails check out.

Is there another configuration thing somewhere that would prevent the 
DAC from producing more volts?

The receiver works beautifully, Alex seems to be doing it's thing with 
antenna selection.

Cheers,
Peter (VK4EA)


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