[Skimmertalk] Skimmer and aggregator question(s)

Fri May 11 07:44:40 PDT 2012

Ok, I must not have the latest version then.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net

-----Original Message-----
From: W3OA [mailto:w3oa at roadrunner.com] 
Sent: Friday, May 11, 2012 13:56
To: K1TTT
Cc: skimmertalk at contesting.com; skimmer at dxwatch.com
Subject: Re: [Skimmertalk] Skimmer and aggregator question(s)

  "To change the Local User Port type the new number in this box."

On 5/11/2012 9:50 AM, K1TTT wrote:
> Look for what?
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt at arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>
>
> -----Original Message-----
> From: W3OA [mailto:w3oa at roadrunner.com]
> Sent: Friday, May 11, 2012 13:39
> To: K1TTT; skimmertalk at contesting.com; skimmer at dxwatch.com
> Subject: Re: [Skimmertalk] Skimmer and aggregator question(s)
>
>    Good point.
>
> Look at the bottom right corner of Aggregator's Connections tab.
>
> 73 - Dick, W3OA
>
> On 5/11/2012 9:24 AM, K1TTT wrote:
>> If you use the aggregator feature that lets you connect to it with 
>> telnet and you have multiple instances on a machine don't you have to 
>> change the port for the telnet connection on some of them?  I don't 
>> see how to do that on the latest aggregator.
>>
>> David Robbins K1TTT
>> e-mail: mailto:k1ttt at arrl.net
>> web: http://wiki.k1ttt.net
>> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>>
>> -----Original Message-----
>> From: Pete Smith N4ZR [mailto:n4zr at contesting.com]
>> Sent: Friday, May 11, 2012 12:56
>> To: skimmertalk at contesting.com
>> Cc: skimmer at dxwatch.com
>> Subject: Re: [Skimmertalk] Skimmer and aggregator question(s)
>>
>> Responses interleaved below, Kaz ...
>>
>> 73, Pete N4ZR
>> The World Contest Station Database, updated daily at 
>> www.conteststations.com The Reverse Beacon Network at 
>> http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots 
>> at telnet.reversebeacon.net, port 7000 and 
>> arcluster.reversebeacon.net, port 7000
>>
>>
>> On 5/10/2012 6:22 PM, kaz wrote:
>>> Hi folks.  First, apologies if this double posts to the list.
>>>
>>> Finally laid hands on a couple of softrock kits, and I am finally 
>>> getting a chance to play with skimmer and SDR.  Way fun.  I expected 
>>> the surface mount parts to be difficult when building the first
Softrock.
>>> Never tried any surface mount project before.  Wrong.  Turns out 
>>> reading the numbers to sort out the capacitors was the hard part.
>>> Bright lights and magnification, and even my 17yo son had 
>>> trouble(and he has 20/13 vision).
>>>
>>> But enough digression.
>>>
>>> Bought skimmer license, have skimmer running on 40m and 80m.  40m 
>>> calibrated(I think), 80m still pending.
>>>
>>> Question#1
>>> I'm not clear on the relationship between the skimmers and aggregator.
>>> If I run a skimmer session for each softrock, do I run aggregator 
>>> for each skimmer?
>>>
>>> My initial expectation was to run the skimmer sessions for each 
>>> Softrock, use wintelnetx to put the spots together, and use 
>>> aggregator to ship the spots to the RBN from the wintelnetx 
>>> window/port used to collect the spots.
>>>
>>> I found the documents N4ZR has written to be "spot on", but I have 
>>> not seen/found any that describe this relationship.  (I probably did 
>>> not look hard enough....???..hints appreciated)
>> Yes, this approach is fine, in principle.  The thing that is 
>> important, from the RBN's perspective, is to keep the association 
>> between a given instance of CW Skimmer and the Softrock for a given 
>> band.  That way, if we see a calibration error coming up on the
>> Skimmer Details page of the website<http.reversebeacon.net>   you'll
>> be able to associate it with that instance of Skimmer and make the
> necessary changes.
>> Rather than running WintelnetX, I suggest you do what Tim, KQ8M does.
>> Here's a quote from an e-mail I just got from him.
>>
>> "Every instance of skimmer has its own Aggregator. There is 3 
>> instance of skimmer and Aggregator running on 2 computers. The other 
>> 2 computers have 2 instances. What I had learned from Dick, W3UA, was 
>> to rename each instance differently [he means to rename the exe 
>> file]and use separate directories, of course. You have to do that 
>> with Skimmer anyhow. I keep Aggregator in each skimmer's directories. 
>> Also, each skimmer uses the same callsign. If you use separate 
>> callsigns it comes out
> separately on the RBN."
>>> Question #2
>>> Is it necessary/required to open the port to the skimmer/aggregator 
>>> to the world_wide_interwebz?  I would really rather not do that at 
>>> this
>> point.
>>
>> Aggregator does not use a port, so you should be able just to start 
>> it and go.
>>> Other trivia:
>>> With two skimmers running on mostly dead bands, a dual core Pentium 
>>> D (Dell Optiplex 745) ticks off about 15-20% CPU when the skimmers 
>>> are minimized.  The 80m softrock skimmer is at 48khz on the on-boad 
>>> Soundmax.  The 40m softrock skimmer is at 96khz on an ASUS Xonar DG.
>>>
>>> The Xonar DG seems to be a fantastic value for a sound card. Also 
>>> available as PCI-E, Xonar DGX.  Its main limitation over the more 
>>> expensive siblings in the Xonar line seems to be its 96khz max 
>>> sample rate, vs 192khz for big brother.
>> 96 KHz comes pretty cheap - the 192 KHz bandwidth is more of a 
>> specialty item.
>>
>> When you first crank up your Softrocks it is likely that you will 
>> have images on the opposite side of the center frequency from the real
signals.
>> You need to run the I/Q Balance calibration to get rid of these.  
>> That routine requires strong signals across the entire range, so I've 
>> found the easiest way is to turn my radio down very low (RF output) 
>> and provide the signals it needs from one end of the range to the other.
>>
>> The other thing that helps a lot is to use audio isolation 
>> transformers on the two channels.  Without them you will probably see 
>> a fairly large noise bump at the center frequency, resulting from hum.
>> The iso transformers will "transform" this into a relatively narrow 
>> dead spot, caused by the lower frequency roll-off of the iso 
>> transformer.  I used some relatively good Triad isos in order no not 
>> have roll-off near the ends of the frequency range, but if you 
>> already have some my suggestion would be to try them and see.
>>
>> HTH
>> _______________________________________________
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>> Skimmertalk at contesting.com
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>>
>>
>>
>
>

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