[Skimmertalk] WTB: QS1R

[Alexander Ranaldi]

This is my QS1R, post-upgrades:

https://www.flickr.com/photos/alexranaldi/41317967445/in/photostream/

https://www.flickr.com/photos/alexranaldi/41317961325/in/photostream/



On Sat, Oct 27, 2018 at 9:25 AM N4ZR <n4zr at comcast.net> wrote:

> Sounds good.  I forgot that I also put heat sinks on the regulators. Over
> the years, it appears that U6 is underrated and is the cause of many Rev D
> failures.
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net> <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
>
> On 10/27/2018 8:40 AM, Alexander Ranaldi wrote:
>
> I also have a Rev D which is still running well, but I made some
> "upgrades" -- I placed large copper heat sinks on the voltage regulators
> with thermal paste, and placed the QS1R board in a new enclosure with a
> home-built self-contained linear power supply and a pair of 80mm fans for
> active cooling.  I'm hoping to avoid heat related failures.
>
> On Fri, Oct 26, 2018 at 9:31 PM N4ZR <n4zr at comcast.net> wrote:
>
>> My Rev. D which is about 9 years old is still running fine.  A couple of
>> years ago I mounted a 2" 5V muffin fan on top of it, and drilled two
>> rows of holes in both sides just above the plane of the PC board.  So
>> far so good...
>>
>> My Red Pitaya in the aluminum case was getting too hot for comfort.  It
>> now has a 1" 5V fan mounted on the network/USB end of the top, sucking
>> air in through the connector slots and around the case's inadequate heat
>> sink. It is powered by the fan connector next to the Ethernet jack.
>>
>> 73, Pete N4ZR
>> Check out the Reverse Beacon Network
>> at <http://reversebeacon.net>, now
>> spotting RTTY activity worldwide.
>> For spots, please use your favorite
>> "retail" DX cluster.
>>
>> On 10/26/2018 5:38 PM, Bill Straw via Skimmertalk wrote:
>> > "Most QS1Rs eventually fail due to component failure related
>> > to excessive heat"
>> >
>> > I dread that day. Setting up the QS1R to do CW and RTTY with
>> > Skimmer server was very cookbook with the info on the RBN
>> > site. The references provided are way past me, I would have
>> > to hire someone to set it up
>> >
>> > Bill KO7SS
>> >
>> >
>> >
>> >
>> >
>> > ________________________________
>> > From: "Bob Wilson, N6TV" <n6tv at arrl.net>
>> > To: SkimmerTalk Reflector <skimmertalk at contesting.com>
>> > Sent: Friday, October 26, 2018 2:21 PM
>> > Subject: Re: [Skimmertalk] WTB: QS1R
>> >
>> >
>> >
>> > Hi Jeff,
>> >
>> > QS1Rs are pretty much unobtainable in working condition.  Most QS1Rs
>> > eventually fail due to component failure related to excessive heat,
>> > especially the voltage regulator.
>> >
>> > I'd highly recommend that you consider buying a Red Pitaya instead of
>> > trying to find a working QS1R.  The Red Pitaya receiver performance is
>> very
>> > similar, it handles 8 bands at 192 kHz instead of only 7, it uses 1 Gbps
>> > Ethernet instead of USB, it has two antenna inputs that can be assigned
>> to
>> > any of the 8 receiver slices, and it probably costs less (new) than a
>> > working QS1R.  The only thing it doesn't do is work with CW Skimmer (the
>> > older single-band version), but it works great with CW Skimmer *Server*,
>> > RTTY Skimmer Server, and HDSDR (simultaneously) plus it can even be
>> > reconfigured into a signal generator, an FT8 transceiver, a WSPR
>> > transceiver, an oscilloscope, etc.
>> >
>> > Some references:
>> >
>> > http://pavel-demin.github.io/red-pitaya-notes/sdr-receiver-hpsdr/
>> > http://hamsci.org/n6tv-red-pitaya-combine-cw-rtty-skimmer-hdsdr
>> > https://groups.io/g/RBN-OPS/message/2190
>> >
>> > http://pavel-demin.github.io/red-pitaya-notes/sdr-transceiver-ft8/
>> > http://pavel-demin.github.io/red-pitaya-notes/sdr-transceiver-wspr/
>> >
>> > 73,
>> > Bob, N6TV
>> >
>> > On Fri, Oct 26, 2018 at 12:38 PM Jeff Blaine <KeepWalking188 at ac0c.com>
>> > wrote:
>> >
>> >> Have a QS1R that needs a new home?
>> >>
>> >> If so, please contact me off list.  Thanks!
>> >>
>> >>> 73/jeff/ac0c
>> >>> alpha-charlie-zero-charlie
>> >>> www.ac0c.com
>> >>>
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