Re: [Elecraft] RF gain sweet spot

[Geoffrey Mackenzie-Kennedy]

Ed,

If you switch between different roofing filters, does the "sweet spot" occur 
at the same position of the "RF" Gain control knob or does it change? Also 
does the noise / S meter dip by the same amount regardless of which filter 
is in use, if not does the depth of dip increase or decrease when switching 
from a wide bandwidth roofer to a narrow bandwidth roofer?

On another reflector there has been some discussion about "pileup mush" 
which has been reported by only a small number of K3 owners, which problem 
IMHO could well be caused by some roofers and the termination presented to 
their output.  Your observations of a "sweet spot" *might* be related.

73,
Geoff
GM4ESD
(who must leave the List tomorrow!)


On July 21, 2011 at 22:52 Z, Ed K7WIA wrote:



>I don't know but I like it this way,   as my noise floor changes through 
>the
> day I do have to readjust the sweet spot,  but it is just a very small 
> turn
> of the RF knob
> I checked this with the noise blanker on and off and I see the same 
> effect,
> it's just with the blanker off I can only reduce it to 2 bars on the 
> meter.
> could be I got a special K3..
>
> Ed K7WIA


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[Elecraft] K2 Noise Blanker Revisions

[Nidge_(G0NIG)]

I'm in the process of trying to bring an early K2 (serial#653) kicking and 
screaming 
into the 21st Century, I'll also point out that I'm not the original builder 
of this 
radio. 

For a while I've not been overly convinced about the sensitivity and dynamic 
range of this particular example, it hasn't helped matters that along the 
way 
in my investigations I found numerous build errors. 

Today my attention was drawn to the Noise Blanker option.  I downloaded 
the manual and noticed there were some major differences between my 
example and that referenced in the manual.  I have looked through the 
Elecraft website and found the archived manual for the main build but I 
can't find an archived manual for this particular example of Noise Blanker. 

I'm lucky in that I have a friend very local to me who is in the process of 
building a K2 and so this morning I had the opertuinity to try his more 
recent 
noise blanker board in my K2.  WHAT A DIFFERENCE 

I would guestimate that there was a 25-30dB increase in performance when his 
noise blanker was installed. 

The biggest visual differences between the two boards are: 

My older example has variable capacitors for C3 and C5. 
Pins 3 and 4 of U3 are shorted together 
L1 and L2 are grey torroids, L1 having 13winding and 
L2 having 14 windings 
L3 is marked with brownish orangey paint and has 15 windings. 

I'm hoping someone maybe able to point me to an archived manual 
for this earlier version of the noise blanker so I can assertain if it is 
reworkable or whether a newer revision should be purchased. 

Regards 

Nidge (G0NIG) 

IO93dv 


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[Elecraft] XG2 low output

[Andrew Moore]

Output on my XG2 3-frequency test oscillator appears to be down (by a
different amount on all 3 frequencies). Tried replacing battery.
 Suggestions on what part(s) might be faulty?

--Andrew, NV1B
..
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[Elecraft] Elecraft W2A wattmeter for sale

[george]

Purchased new several months ago factory assembled.Now that I have the KPA500 I 
don’t see a need for it.Looks new and works as new.Has the DCHF-2000 coupler 
2000 Watts 1.8-54 mhz.Contact off list if interested.$195.00 plus $12.00 USPS 
Priority Mail.Good in QRZ wb5xx
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[Elecraft] KPA500K Delivery

[W6NEK]

For those keeping track of KPA500K deliveries:
KPA500K ordered 5/17/11
Received notice of delivery on 7/15/11
Received KPA500K S/N 236 on 7/21/11

Guess what I'll be doing today? ;-)

73,
Frank - W6NEK

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Re: [Elecraft] RF gain sweet spot

[K7WIA]

Geoff...  my K3 only has the one filter in it at the present time, so I can't
check that out for you.

Ed  K7WIA

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[Elecraft] KPA500 Air Flow Space Concern

[W0UCE]

I am rebuilding my station console and would like to put a wooden shelf
above my KPA500 but am concerned about blocking air flow to the top of the
opening on the top right of the amp.   The KPA will sit on the operating
table desktop with the front raised using the bail.  If I put a shelf over
the amp I can cut an opening for airflow space if necessary.

 

If anyone has experience or suggestions regarding minimum space for airflow
I would appreciate your input.  Contact offline if you prefer. 

 

Thanks,

Jack

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[Elecraft] P3

[Phil LaMarche]

Going to order a P3 to finish my K Line.  Any problem putting it on top of
the K3?  Space problem after  the KPA500.

 

Phil

 

Philip LaMarche

 

LaMarche Enterprises, Inc

 

  p...@lamarcheenterprises.com

  www.LaMarcheEnterprises.com  

 

727-944-3226

727-937-8834 Fax

727-510-5038 Cell 

   www.w9dvm.com

K3 # 1605

KPA500 # 029

 

 CCA 98-00827

CRA 1701

W9DVM

 

 

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Re: [Elecraft] KPA500 Air Flow Space Concern

[Lyle Johnson]

The KPA500 manual indicates the required clearances.

73,

Lyle KK7P

> I am rebuilding my station console and would like to put a wooden shelf
> above my KPA500 but am concerned about blocking air flow to the top of the
> opening on the top right of the amp.

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Re: [Elecraft] KPA500K Delivery

[Robert Garceau]

Wow, their cranking them out.
I received #165 on July 13rd. 

Bob, W1EQ


-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of W6NEK
Sent: Friday, July 22, 2011 11:13 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA500K Delivery

For those keeping track of KPA500K deliveries:
KPA500K ordered 5/17/11
Received notice of delivery on 7/15/11
Received KPA500K S/N 236 on 7/21/11

Guess what I'll be doing today? ;-)

73,
Frank - W6NEK

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Re: [Elecraft] XG2 low output

[Don Wilhelm]

Andrew,

Check to see if you have 1.22 volts at the cathode of U1.  If not, 
replace U1.
Other than that, check the soldering (re-flow if in doubt) - there are 
just not that many components to give trouble.

73,
Don W3FPR

On 7/22/2011 9:21 AM, Andrew Moore wrote:
> Output on my XG2 3-frequency test oscillator appears to be down (by a
> different amount on all 3 frequencies). Tried replacing battery.
>   Suggestions on what part(s) might be faulty?
>
> --Andrew, NV1B
>
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Re: [Elecraft] XG2 low output

[Alexey Kats]

Andrew,

One more suggestion - check if either D1 or D2 (near the output socket) are
shorted. (Tony KT0NY had somewhat similar problem recently and in his case
D2 was shorted, besides of other reasons.)

On Fri, Jul 22, 2011 at 10:29 AM, Don Wilhelm  wrote:

> Andrew,
>
> Check to see if you have 1.22 volts at the cathode of U1.  If not,
> replace U1.
> Other than that, check the soldering (re-flow if in doubt) - there are
> just not that many components to give trouble.
>
> 73,
> Don W3FPR
>
> On 7/22/2011 9:21 AM, Andrew Moore wrote:
> > Output on my XG2 3-frequency test oscillator appears to be down (by a
> > different amount on all 3 frequencies). Tried replacing battery.
> >   Suggestions on what part(s) might be faulty?
> >
> > --Andrew, NV1B
> >
>

-- 
Alexey Kats (neko)
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Re: [Elecraft] P3 location

[John Ragle]

Phil...

 My P3 lives atop my K3/100 with no problems. To its left sits my 
SignaLink USB. The K3 is very adequately ventilated through the 
rear...the only down-side (and it is totally minimal) is that the SL 
sits over the speaker grill. It does not block the sound.

John Ragle -- W1ZI

On 7/22/2011 12:43 PM, Phil LaMarche wrote:
> Going to order a P3 to finish my K Line.  Any problem putting it on top of
> the K3?

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[Elecraft] Two questions: ESD & Solder issue w/ PC Board

[Edward R. Cole]

David,

Sounds like you have set up well for ESD work.  Winter low humidity 
conditions are more prone to static electricity.  Try not to wear 
synthetic fabrics when working on sensitive stuff.  Do you have a 
anti-static pad?  I didn't see mention of one. They are added 
insurance when working with static-sensitive parts.

There a few things to ensure better soldering.  One thing often 
overlooked about new pc boards it to prepare the surface by rubbing 
the surface with a plain eraser (such as used with a pencil).  Also 
wiping off the surface with alcohol helps remove any surface 
contaminants like hand oils that interfere with solder flow.  Also 
try to avoid handling the traces with your hands.

When soldering do you use a moistened sponge for wiping the 
tip?  keeping the tip tinned is important.  Using the proper tip for 
the application helps (small chisel tips for surface mount 
components); larger tip for soldering to large metal parts.  Adjust 
heat according to size of the item to be soldered.  Clean items to be 
soldered (see above).  I use an acid brush and alcohol (or electronic 
cleaner) on connector pins to promote solder flow.  IN certain 
situations using a little flux makes a big difference (especially on 
large metal items).

Perhaps others will think of something I overlooked.

73, Ed
--

Message: 1
Date: Thu, 21 Jul 2011 09:12:50 -0700 (PDT)
From: David Dietrich 
Subject: [Elecraft] Two questions: ESD & Solder issue w/ PC Board
To: "elecraft@mailman.qth.net" 
Message-ID:
 <1311264770.12849.yahoomail...@web120521.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

Hi Everyone!

I have two questions that I would like to pose to the group about 
grounding and soldering PC boards:

1.? I know about ESD precautions, and I do take them.? I have a wrist 
strap, and my soldering iron is ESD safe.? I am working on my K2 in 
the basement.? I have pained concrete floors and walls.? I sit in a 
rolling chair that doesn't seem to have any static issues.? And, my 
work table is a painted wood bench.? As long as I wear my wrist 
strap, I should be OK due to the environment I am in, right?? I'd be 
more concerned if I was working in a carpeted room or the like.? 
Unless it is winter and I wear a sweater, I never have ESD problems 
down in the shack.


2.? Has anyone else had this happen to them...You go to solder your 
components onto the board, and the component or board doesn't want to 
take the solder immediately?? I had this problem with the 160 meter 
board yesterday.? I am using a Weller soldering station with a tip 
that looks to be in good order, Kester 60/40 solder, and proper 
technique.? Any ideas?

73 & Thanks,

David
KC9EHQ





73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep dubus...@gmail.com
==

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[Elecraft] WTB: P3

[Phil LaMarche]

No hurry but if anyone wants to sell their P3 for whatever reason, please
contact me.

 

Thanks

 

Phil

 

Philip LaMarche

 

LaMarche Enterprises, Inc

 

  p...@lamarcheenterprises.com

  www.LaMarcheEnterprises.com  

 

727-944-3226

727-937-8834 Fax

727-510-5038 Cell 

   www.w9dvm.com

K3 # 1605

KPA500 # 029

 

 CCA 98-00827

CRA 1701

W9DVM

 

 

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Re: [Elecraft] KPA500K Delivery

[Dave KK7SS]

"Honey do's" ??

>From: "W6NEK" 
>KPA500K ordered 5/17/11
>Received notice of delivery on 7/15/11
>Received KPA500K S/N 236 on 7/21/11

>Guess what I'll be doing today? ;-)

--
Dave G  KK7SS
 Richland, WA
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[Elecraft] K1 for sale - mint condition

[Craig D. Smith]

The K1 has been sold.

73  Craig  AC0DS



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Re: [Elecraft] RF gain sweet spot

[Guy Olinger K2AV]

It is possible that there is a problem in the RF gain pot.  It IS a
potentiometer.  It has a standard voltage across it, and the variable
voltage in the pot's "wipe" is sent to an analog to digital converter,
which converts the pot setting to "numerical advice" which can be more
easily sent to the CPU over one of the various digitally multiplexed
communication busses.

It could be a non-linearity in the potentiometer, where on a normal
K3, the "sweet" spot would be a point in the gain setting where the
absolute unchanging difference between signal and noise is interpreted
most favorably by the ear/brain which has its own way of hearing. That
trick has been around for a long time.

73, Guy.

On Fri, Jul 22, 2011 at 11:17 AM, K7WIA  wrote:
> Geoff...  my K3 only has the one filter in it at the present time, so I can't
> check that out for you.
>
> Ed  K7WIA
>
> --
> View this message in context: 
> http://elecraft.365791.n2.nabble.com/RF-gain-sweet-spot-tp6604787p6610829.html
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[Elecraft] Help K3 KAT3 No readout no tx carrier

[Chris Soames]

Help needed by myself a self confessed technical idiot.
Hi All I am having a problem with my K3 when I built it last December I 
did so with the KAT3 auto tuner built in.
It has worked fine for me since then until about a week ago when for 
some reason it changed its mind.
Now when I press ATU TUNE button on the front of the K3 the following 
happens ,,
  the KAT3 whirrs and clicks like it is tuning but I no longer get the 
SWR readout on the screen instead I get 2 -- marks also when I TX the 
rig TxX light illuminates red but apparently no carrier is TX'd.

I have tried several time to call colleagues that I know can usually  
hear me, I have heard them but they are no longer RX'ing me.
I have searced the manual but can find no symptom in it let alone a cure 
so guys I am open to suggestions.

Yes the KAT3 is set to Auto.
Yes it makes all the right noises.
Yes I have tried different antenna's.
Yes I have tried different Coax's.
Yes I have tried resetting the KAT3 and waiting the 5 second however 
after doing so nothing seems to happen at all
Yes I have tried both Ant 1 and Ant 2.

It just don't seem to work.

Chris
G0TZZ
In desperation.
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Re: [Elecraft] RF gain sweet spot

[K7WIA]

No I don't believe there is a problem with the pot.  because as I just start
to turn it the gain reduces smoothly all the way.   I believe it could be in
the software, where as when the gain is reduced the ckt. that controls the
bars in the S meter does not kick in soon enough. 
but it seams when I reduce the gain to where the ant. noise gets close to
-136 dbm ( the noise floor of the K3) that is where I can detect the weak
ones the best. It is just that my  ears and brain seam to be more sensitive
when the audio is soft than when it is loud, as when there is a lot of noise
with the signal. it is just that I reduce the ant. noise close to the noise
floor of the K3, the signals are still there and they stand out better for
me... it's just that I started to use the old trick that been around for
years, and noticed the S meter did not follow the gain control.

Ed  K7WIA

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[Elecraft] Elecraft] RF gain sweet spot

[Edward R. Cole]

Ed (K7WIA):

OK, so it looks like we have a very similar set ups.  Your numbers 
let me think about this a bit more.

Your ambient noise is maybe 1-2 s-units higher than mine:
P50VDG:  you=S7, mine=S4.5-5
PRE (K3): you=S3, mine=S3  [interesting - I'll come back to this]
K3 with all off:  you=S2, mine=0.5-1

All I can think of is that you are reducing noise input when you 
lower your RFG to match the internal noise produced by your radio 
plus preamps (if on).  And that explains the drop in received noise 
to a point where the gain drop faster.

Receiving sensitivity on HF/MW/LF is mainly determined by receiver 
gain, bandwidth, and detector threshold.  If you have enough gain you 
maximize sensitivity.  Noise Figure (and its counterpart noise 
temperature) are not significant compared to the huge level of sky 
noise present <30-MHz.  Sky noise temperature is something like 
15-20,000 Kelvin (K)

OK, at 1296-MHz sky temperature is in the range of 5-10K, so 
obtaining a very low receiver noise temp (noise figure) is extremely 
important for good receiver sensitivity.  Current Gas-Fet technology 
provides us with 18-30K low-noise preamps.

At 50-MHz we are half like HF and half like VHF/UHF as sky noise runs 
about 2000K.  The ARR P50VDG and the K3 PR6 are about 0.5 dB noise 
figure (or 35.4K).  If we add Tr=35.4K to Tsky=2000K and maybe add 
Tant=100K the result is 2135K.  As you can see lowering receive noise 
temp (noise figure) will not make much improvement in sensitivity due 
to the sky noise background.

In urban environments you add local noise, Tn to Tsky and that might 
be several additional hundred's K of noise temperature.

So at 6m a receiver's signal sensitivity is mainly a function of 
having sufficient gain to drive the detector in the radio 
properly.  It looks like this is reached somewhere between the gain 
of the PRE and either P50VDG and PR6.  I will hazard a guess this is 
about 18-dB gain.  Both preamps produce about 24 dB gain so that is 
why the s-meter reads higher than with the PRE.  The PRE is set in 
gain just about at the level for best reception thus we see little 
change when RFG is lowered.

In K7WIA's case he lowers the gain to reach this point.  In my case I 
have less external noise so lowering gain does not appear to have any 
effect on received noise.

What would be a better test is with a weak signal looking at detected 
SNR.  Also being sure both radio parameters like bandwidth and mode 
are the same.  One of the reasons to narrow bandwidth at VHF is to 
reduce the amount of noise power being received.  You reach optimum 
at about the point the bandwidth matches the width of the signal 
being received.  For CW this about 5-15 Hz (depending on speed) 
filters ring when that narrow so the human mind is the final CW 
filter with 50-Hz about the practical minimum bandwidth that is usable.

Digital modes like WSJT (JT-65) are 4.7 Hz wide so DSP filters of 
that width are used to dig out the signal way below the level of a 
signal that can be heard with human ears (about 10-dB weaker than CW).

Anyway I digressed from the main topic.

I would be interested if other K3 owners looked at their 6m noise 
indication when RFG is backed off slightly.

73, Ed - KLUW
--

Message: 12
Date: Thu, 21 Jul 2011 13:00:27 -0700 (PDT)
From: K7WIA 
Subject: Re: [Elecraft] RF gain sweet spot
To: elecraft@mailman.qth.net
Message-ID: <1311278427206-6608306.p...@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii

Yes I am using the K3
I was using the preamp that is in the K3,I also have the ARR P50VD
preamp on the back of the K3 but using it just raises the background noise
to S7.
Remember I live in the city.  I can turn off the preamp that is in the K3,
disconnect the antenna listen to the hiss of the K3, and then hook the
antenna back and hear the noise increase.. i am going to try it with out
using any preamp at all...I can still detect the weak beacon that are in my
area.  and still hear a increase in noise when the antenna is connected. but
just to reduce the background noise has helped my 73 yo ears make the weak
ones stand out better.
even without the preamp on I still get the 2nd bar on the S meter to
flicker,  and  i can reduce the Rf gain just slightly ( not much) to dip the
S meter.
just the joys of living in a big city,  powerline, and wireless headphones
on 6 meters

Ed   K7WIA




73, Ed - KL7UW, WD2XSH/45
==
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep dubus...@gmail.com
==

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Re: [Elecraft] RF gain sweet spot

[Merv Schweigert]

Was interested in this thread and find that my K3 does the same thing,  
but takes a
"vernier" touch to see it,  very slight movement of the pot at about 
the  2:30 to 3 oclock
position causes the S meter to "dip" down about 1 bar.   Never noticed 
it because
of the very small area, one passes by so fast you will never see it.
I also find thats about where I run my RF gain almost 99 percent of the 
time,
Its not the dip that means anything at all,  its where you run the RF 
gain that is
what works.   With this many K3 exhibiting the same thing its not the 
gain pot,
its something in firmware,  which as far as I can tell does nothing at 
all other
than its the same place approx where its a good spot to run the RF gain.

Merv K9FD/KH6
> It is possible that there is a problem in the RF gain pot.  It IS a
> potentiometer.  It has a standard voltage across it, and the variable
> voltage in the pot's "wipe" is sent to an analog to digital converter,
> which converts the pot setting to "numerical advice" which can be more
> easily sent to the CPU over one of the various digitally multiplexed
> communication busses.
>
> It could be a non-linearity in the potentiometer, where on a normal
> K3, the "sweet" spot would be a point in the gain setting where the
> absolute unchanging difference between signal and noise is interpreted
> most favorably by the ear/brain which has its own way of hearing. That
> trick has been around for a long time.
>
> 73, Guy.
>
> On Fri, Jul 22, 2011 at 11:17 AM, K7WIA  wrote:
>
>> Geoff...  my K3 only has the one filter in it at the present time, so I can't
>> check that out for you.
>>
>> Ed  K7WIA
>>
>> --
>> View this message in context: 
>> http://elecraft.365791.n2.nabble.com/RF-gain-sweet-spot-tp6604787p6610829.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
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>>  
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>

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[Elecraft] P3

[Phil LaMarche]

Please, the width of the P3?

 

Phil

 

Philip LaMarche

 

LaMarche Enterprises, Inc

 

  p...@lamarcheenterprises.com

  www.LaMarcheEnterprises.com  

 

727-944-3226

727-937-8834 Fax

727-510-5038 Cell 

   www.w9dvm.com

K3 # 1605

KPA500 # 029

 

 CCA 98-00827

CRA 1701

W9DVM

 

 

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[Elecraft] Thanks for all the replies on the width!

[Phil LaMarche]

 

 

Philip LaMarche

 

LaMarche Enterprises, Inc

 

  p...@lamarcheenterprises.com

  www.LaMarcheEnterprises.com  

 

727-944-3226

727-937-8834 Fax

727-510-5038 Cell 

   www.w9dvm.com

K3 # 1605

KPA500 # 029

 

 CCA 98-00827

CRA 1701

W9DVM

 

 

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Re: [Elecraft] RF gain sweet spot

[K7WIA]

This would be a nice feature to have put into the menu.
to set the manual gain to max. then go into the menu and be able to adjust
the maximum gain to the way you like it.

Ed K7WIA

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Re: [Elecraft] P3

[John Ragle]

Phil...nominally 6"

John Ragle -- W1ZI




On 7/22/2011 4:27 PM, Phil LaMarche wrote:
> Please, the width of the P3?

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Re: [Elecraft] Help K3 KAT3 No readout no tx carrier

[Don Wilhelm]

Chris,

First simplify your setup by eliminating the antenna from the equation.
If you have an in-line wattmeter, connect it between the K3 and the 
dummy load.
Do an ATU TUNE - make sure you have the correct ANT selected.
What do you see for the SWR?
When you transmit, what do you see for the power output?

If you can tune into a dummy load, and the power output is close to the 
power setting on the K3, then you can look to your antenna system for 
your answers, but if you get "crazy" results into the dummy load, first 
check the coax between the K3 and the dummy load, and then blame the K3.

73,
Don W3FPR

On 7/22/2011 3:38 PM, Chris Soames wrote:
> Help needed by myself a self confessed technical idiot.
> Hi All I am having a problem with my K3 when I built it last December I
> did so with the KAT3 auto tuner built in.
> It has worked fine for me since then until about a week ago when for
> some reason it changed its mind.
> Now when I press ATU TUNE button on the front of the K3 the following
> happens ,,
>the KAT3 whirrs and clicks like it is tuning but I no longer get the
> SWR readout on the screen instead I get 2 -- marks also when I TX the
> rig TxX light illuminates red but apparently no carrier is TX'd.
>
> I have tried several time to call colleagues that I know can usually
> hear me, I have heard them but they are no longer RX'ing me.
> I have searced the manual but can find no symptom in it let alone a cure
> so guys I am open to suggestions.
>
> Yes the KAT3 is set to Auto.
> Yes it makes all the right noises.
> Yes I have tried different antenna's.
> Yes I have tried different Coax's.
> Yes I have tried resetting the KAT3 and waiting the 5 second however
> after doing so nothing seems to happen at all
> Yes I have tried both Ant 1 and Ant 2.
>
> It just don't seem to work.
>
> Chris
> G0TZZ
>
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[Elecraft] N2CQ QRP Contest Calendar: July 25 - Aug 22, 2011

[Ken Newman]

~
N2CQ QRP CONTEST CALENDAR
July 25 to Aug 22, 2011 
~
UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest ***
Jul 25, 1930z to 2030z
Rules: http://www.on5ex.be/foxhunt/foxhunt.html
~
SKCC Sprint (Straight Key CW)  ... QRP Awards
Jul 27, z to 0200z
Rules: http://www.skccgroup.com/sprint/sks/
~
CWops Mini-CWT Test (CW) ... QRP Category
July 27, 1300z to 1400z and
July 27, 1900z to 2000z and
July 28, 0300z to 0400z
Rules: http://www.cwops.org/onair.html
~
Summer FOX Hunt - QRP 20M CW... QRP Contest!
EDT: July 28, 9 PM  to 1029 PM
UTC: July 29, 0100z to 0229z 
Info: http://www.qrpfoxhunt.org/
~
Islands On The Air Contest (CW/SSB) ... QRP Category
Jul 30, 1200z to Jul 31, 1200z
Rules: http://www.rsgbcc.org/hf/rules/2011/riota.shtml
~
Flight of the Bumblebees (CW) ... QRP Contest!
EDT: Jul 31, 1300  to 1700
UTC: Jul 31, 1700z to 2100z
Rules: 
http://adventure-radio.org/wiki/index.php?title=Flight_of_the_Bumblebees
~
UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest ***
Aug 1, 1930z to 2030z
Rules: http://www.on5ex.be/foxhunt/foxhunt.html
~
Adventure Radio Spartan Sprint (CW) *** QRP Event! ***
Aug 2, 0100z to 0300z (First Monday 9 PM EDT)
Info: http://adventure-radio.org/wiki/index.php?title=Spartan_Sprints
~
Summer FOX Hunt - QRP 20M CW... QRP Contest!
EDT: Aug 4, 9 PM  to 1029 PM
UTC: Aug 5, 0100z to 0229z 
Info: http://www.qrpfoxhunt.org/
~
Ten-Ten QSO Party (PH) ... QRP Category
Aug 6, 0001z to Aug 7, 2359z
Rules: http://www.ten-ten.org/Forms/QSOPartyRules_082710.pdf
~
TARA "Grid Dip" Contest  (PSK/RTTY) ... QRP Category
Aug 6, z to 2400z
Rules: http://www.n2ty.org/seasons/tara_grid_rules.html
~
EUROPEAN HF CHAMPIONSHIP (PH/CW) (EU work EU) Low Power Category
Aug 6, 1200z to 2359z
Rules: http://lea.hamradio.si/~scc/euhf/euhfcrules.htm
~
ARRL UHF Contest ... Low Power Category
Aug 6, 1800z to Aug 7, 1800z
Rules: http://www.arrl.org/august-uhf
~
North American QSO Party (CW) ... 100W Max.  (/QRP noted on entry)
Aug 6, 1800z to Aug 7, 0600z
Rules: http://www.ncjweb.com/naqprules.php
~
UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest ***
Aug 8, 1930z to 2030z
Rules: http://www.on5ex.be/foxhunt/foxhunt.html
~
NAQCC Straight Key/Bug Sprint (CW) *** QRP Contest ***
EDT: Aug 09, 8:30 PM to 10:30 PM
UTC: Aug 10, 0030Z to 0230Z
Rules: http://naqcc.info/contests.html
~
CWops Mini-CWT Test (CW) ... QRP Category
Aug 10, 1300z to 1400z and
Aug 10, 1900z to 2000z and
Aug 11, 0300z to 0400z
Rules: http://www.cwops.org/onair.html
~
NAQCC-EU Monthly Sprint (CW) *** QRP Contest ***
Aug 10, 1800z to 2000z
Rules: http://naqcc-eu.org/sprints

Summer FOX Hunt - QRP 20M CW... QRP Contest!
EDT: Aug 11, 9 PM  to 1029 PM
UTC: Aug 12, 0100z to 0229z 
Info: http://www.qrpfoxhunt.org/
~
Worked All Europe DX Contest (CW) ... 100W category
Aug 13, z to Aug 14, 2359z
Rules: http://www.darc.de/referate/dx/contest/waedc/en/rules/
~
Maryland/DC QSO Party (SSB/CW) ... QRP Category
Aug 13, 1600z to Aug 14, 0400z
Aug 14, 1600z to Aug 14, 2359z
Rules: http://mdcqsoparty.w3vpr.org/
~
SKCC Weekend Sprintathon (Straight Key CW) ... QRP Category
Aug 14, z to 2359z
Rules: http://www.skccgroup.com/sprint/wes/index-wes.html
~
UBA Foxhunt (CW/PSK31/SSB) *** QRP Contest ***
Aug 15, 1930z to 2030z
Rules: http://www.on5ex.be/foxhunt/foxhunt.html
~
Summer FOX Hunt - QRP 20M CW... QRP Contest!
EDT: Aug 18, 9 PM  to 1029 PM
UTC: Aug 19, 0100z to 0229z 
Info: http://www.qrpfoxhunt.org/
~
SARTG WW RTTY Contest ... Low Power Category
Aug 2

Re: [Elecraft] P3 location

[Jim Brown]

On 7/22/2011 10:55 AM, John Ragle wrote:
> My P3 lives atop my K3/100 with no problems. To its left sits my
> SignaLink USB. The K3 is very adequately ventilated through the
> rear...the only down-side (and it is totally minimal) is that the SL
> sits over the speaker grill. It does not block the sound.

I've tried left side, right side, and top for my P3s, and have settled 
on top. To avoid interference with ventilation, it needs to sit to one 
side, which leaves at least half of the top open.  That's important -- 
ventilation requires both a gozinta and gozouta, and the rear top grille 
is part of that path.  I just finished a 10 hour RTTY contest, running 
the K3s at 100w barefoot, and I never heard the fans speed up.

73, Jim K9YC
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Re: [Elecraft] KPA500 Air Flow Space Concern

[n5ge]

Jack,

My KPA500 is on my table top with the bail up with a shelf that is 1.25 inches
above the front of the KPA500 and there is about one inch of space on both sides
of the amp and the back of the amp is about a foot from the nearest wall and the
connections to the back of the amp all drop down below the table top.  There is
about 3.5 inches clearance between the top of the amp and the bottom of the
shelf at the rear of the amp.

It's always 75F in my shack year round.  The amp temp when idle for a few
minutes is 26C.  I leave the fan running on speed 1 all the time, so the temp
drops rapidly when I've stopped sending CW.  The top of the amp never gets warm.

73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member


On Fri, 22 Jul 2011 12:38:50 -0400, "W0UCE"  wrote:

>I am rebuilding my station console and would like to put a wooden shelf
>above my KPA500 but am concerned about blocking air flow to the top of the
>opening on the top right of the amp.   The KPA will sit on the operating
>table desktop with the front raised using the bail.  If I put a shelf over
>the amp I can cut an opening for airflow space if necessary.
>
> 
>
>If anyone has experience or suggestions regarding minimum space for airflow
>I would appreciate your input.  Contact offline if you prefer. 
>
> 
>
>Thanks,
>
>Jack
>
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Re: [Elecraft] XG2 low output

[Andrew Moore]

Problem solved!

Thank you in particular to Tony KT0NY, Don W3FPR and Alexey.

Turns out that D1 was the problem.  Note!  It wasn't due to a short as some
had suggested, but rather, checking the errata sheet revealed that on the
Rev. A board (like mine), the silk screen was backwards.  The banded end of
diode D1 (1N4148) should be nearest to R7, which is the opposite of what the
silkscreen suggests.  Turns out my XG2 was assembled incorrectly from the
start (I'm guilty).  Not sure if the errata was issued yet when bought my
XG2 or if that came afterwards, but in any case, I cut out D1 and replaced
it in the opposite direction and instantly have a proper 50 uV signal.

I did also remove D2 (the rectangular "output" LED) but I'm not sure if that
was a problem or not.

Thank you all; I would never have noticed this problem unless you mentioned
it.  Now I will proceed with calibrating the K3 using this reference signal.

--Andrew, NV1B
..
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Re: [Elecraft] XG2 low output

[Andrew Moore]

I forgot to mention... thanks Chuck W5UXH

--Andrew, NV1B
..


On Fri, Jul 22, 2011 at 10:03 PM, Andrew Moore wrote:

> Problem solved!
>
> Thank you in particular to Tony KT0NY, Don W3FPR and Alexey.
>
> Turns out that D1 was the problem.  Note!  It wasn't due to a short as some
> had suggested, but rather, checking the errata sheet revealed that on the
> Rev. A board (like mine), the silk screen was backwards.  The banded end of
> diode D1 (1N4148) should be nearest to R7, which is the opposite of what the
> silkscreen suggests.  Turns out my XG2 was assembled incorrectly from the
> start (I'm guilty).  Not sure if the errata was issued yet when bought my
> XG2 or if that came afterwards, but in any case, I cut out D1 and replaced
> it in the opposite direction and instantly have a proper 50 uV signal.
>
> I did also remove D2 (the rectangular "output" LED) but I'm not sure if
> that was a problem or not.
>
> Thank you all; I would never have noticed this problem unless you mentioned
> it.  Now I will proceed with calibrating the K3 using this reference signal.
>
> --Andrew, NV1B
> ..
>
>
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[Elecraft] K2 Heatsink temperatures

[W2bpi1]

Put a thermometer in the middle of the  heatsink on my rig. On  long CW 
xmissions I see temps as high as 145 Degrees F. Shack temp is 85F. I  have the 
fan set to run on high all the time. Is this normal. I laid another  small 
fan on the heatsink and the temp stayed below 115F. Has anyone added more  
cooling to their K2?  73 George/W2BPI
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Re: [Elecraft] K2 Heatsink temperatures

[Don Wilhelm]

George,

That 145 degF temperature is 62.8 degC.  While that is high, it is not 
so high to create any damage.
Your shack temperature is much higher than what is considered "normal 
ambient", so that is a contributing factor.

The auxiliary cooling with your high ambient temperature is a good 
thing.  115 degF is 46.1 degC.

In "normal" situations with an ambient temperature of 23 degC, the 
internal fan will do its job nicely and will usually keep the heatsink 
temperature below 60 degC.  If the CAL tpa parameter is set properly, 
the fan will go to high speed at 40 degC (104 degF) and remain on high 
until the temperature drops to 37 degC (98,6 degF).

In most cases, the "hold" temperature rule applies.  If you can hold 
your hand on it with only minor discomfort, all is OK, but if you cannot 
hold your hand on it for more than 2 minutes, it is hotter than normal.

We are experiencing some hotter than normal temperatures over much of 
the NA continent, so be safe and stay cool.  Temperatures in excess of 
100 degF are expected here in North Carolina for the next 2 days, with 
heat indexes in excess of 115 degF - going outside is like stepping into 
a sauna bath.  Anyone disagree with global climate change?

73,
Don W3FPR

On 7/22/2011 10:33 PM, w2b...@aol.com wrote:
> Put a thermometer in the middle of the  heatsink on my rig. On  long CW
> xmissions I see temps as high as 145 Degrees F. Shack temp is 85F. I  have the
> fan set to run on high all the time. Is this normal. I laid another  small
> fan on the heatsink and the temp stayed below 115F. Has anyone added more
> cooling to their K2?  73 George/W2BPI
>
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[Elecraft] K3 Utility and OS X Lion

[David Fleming]

I've received several emails concerning the compatibility of the K3 Utility for 
Mac with OS X Lion. I installed Lion on my development iMac and initial tests 
show no issues with the K3 Utility, P3 Utility and W2 Utility. Everything seems 
to be working FB.

There are already plenty of comprehensive reviews of Lion out there. I wanted 
to mention a couple of my observations that you might find useful. The online 
upgrade was an interesting experience. It was much like downloading apps on the 
iPhone and iPad. At 3.74 GB, the download took about 45 minutes over my fairly 
speedy Cox Cable connection. I don't know how dial-up folks will fare (if there 
are any Mac users still on dial-up). Not very well I suspect. Once the download 
was complete, after I kicked off the installer and clicked past the license 
agreement,  the installation took about 25-30 minutes.  One of the first things 
I noticed, other than the new "natural" scrolling, which you will either love 
or hate, is the fact that the User Library folder is now hidden. I suppose 
Apple did this to prevent new users from inadvertently deleting this important 
folder. The K3 Utility (and many other apps) use the ~/Library/Application 
Support folder to store
 application data. I find myself navigating to the Library folder very often. I 
was a bit panicky when I thought it was no longer there! Turns out it is still 
there, but it is now hidden. This is very easy to fix by opening up the 
Terminal and typing in this line:

chflags nohidden ~/Library

If you want to hide it again:

chflags hidden ~/Library

Scrollbars have been removed and now only subtly appear when you are actually 
scrolling (ala iOS). Once you get used to the natural scrolling of list views 
and windows there is no going back. As I mentioned above, you'll either love it 
or hate it. You can always switch back to the classic scrolling if you want, 
but give the new scrolling a chance. It is one of those things that once you 
get used to it, it feels completely natural.


If you're on the fence about upgrading to Lion, I say go for it. It's an 
impressive piece of software.

73,

David, W4SMT
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[Elecraft] XV-144 Receiver RF Amp Bias Adjustments

[KJ4YQK]

R13 is not adjusting anything.  0 volts.  I was wondering what to look for. 
Has anybody experience this, and what is the corrected action.  
What voltage should I read at C4 D3 junction.  Should it be 6.8 volts?

Thanks Dave

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Re: [Elecraft] K3 Utility and OS X Lion

[Phil Hystad]

David,

For those slow dialup links, Apple offers a DVD version of Lion for $49 via the 
Apple Store.  My installation procedure on two iMacs and my Macbook Pro was 
about the same as your experience.  Thanks for the tip on the hidden Library.  
When I read your message I jumped over to my terminal window which is almost 
always running somewhere on my mac to take a look.  I was surprised to find 
that ~/Library was quite visible.  Then, I realized that you were speaking of 
the hidden flag for the Finder GUI and not the File system itself.

I agree that Lion is a great system although I am still getting used to the 
change in gestures for scrolling.  I have the touch pad and also the magic 
mouse on all my systems (my wife has one of the iMacs) so I use gestures for 
scrolling quite a bit and the reversal is a little getting used to although I 
had known of this by watching the WWDC videos from earlier this year.

Unfortunately, we did find one little glitch.  My wife's Rosetta Stone 
application does not recognize the audio input microphones anymore although 
they are there and working just fine (both internal and external USB).  I need 
to call this into Rosetta.

73, phil, K7PEH


On Jul 22, 2011, at 9:50 PM, David Fleming wrote:

> I've received several emails concerning the compatibility of the K3 Utility 
> for Mac with OS X Lion. I installed Lion on my development iMac and initial 
> tests show no issues with the K3 Utility, P3 Utility and W2 Utility. 
> Everything seems to be working FB.
> 
> There are already plenty of comprehensive reviews of Lion out there. I wanted 
> to mention a couple of my observations that you might find useful. The online 
> upgrade was an interesting experience. It was much like downloading apps on 
> the iPhone and iPad. At 3.74 GB, the download took about 45 minutes over my 
> fairly speedy Cox Cable connection. I don't know how dial-up folks will fare 
> (if there are any Mac users still on dial-up). Not very well I suspect. Once 
> the download was complete, after I kicked off the installer and clicked past 
> the license agreement,  the installation took about 25-30 minutes.  One of 
> the first things I noticed, other than the new "natural" scrolling, which you 
> will either love or hate, is the fact that the User Library folder is now 
> hidden. I suppose Apple did this to prevent new users from inadvertently 
> deleting this important folder. The K3 Utility (and many other apps) use the 
> ~/Library/Application Support folder to store
> application data. I find myself navigating to the Library folder very often. 
> I was a bit panicky when I thought it was no longer there! Turns out it is 
> still there, but it is now hidden. This is very easy to fix by opening up the 
> Terminal and typing in this line:
> 
> chflags nohidden ~/Library
> 
> If you want to hide it again:
> 
> chflags hidden ~/Library
> 
> Scrollbars have been removed and now only subtly appear when you are actually 
> scrolling (ala iOS). Once you get used to the natural scrolling of list views 
> and windows there is no going back. As I mentioned above, you'll either love 
> it or hate it. You can always switch back to the classic scrolling if you 
> want, but give the new scrolling a chance. It is one of those things that 
> once you get used to it, it feels completely natural.
> 
> 
> If you're on the fence about upgrading to Lion, I say go for it. It's an 
> impressive piece of software.
> 
> 73,
> 
> David, W4SMT
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