Re: [Elecraft] LiIon types, and safety (was: Fire in the house li-ion)

[Ron D'Eau Claire]

I have found that having a KXBT2 around is very handy in the shop. If I have
the K2, K3, KX3 or other 13V rig on the bench and want to power it up for
checks, to run an alignment, etc., I just plug in the KXBT2. 

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
Stephen Prior
Sent: Wednesday, May 24, 2017 3:08 PM
To: Wayne Burdick
Cc: Elecraft Reflector
Subject: Re: [Elecraft] LiIon types, and safety (was: Fire in the house
li-ion)

Which is why I've given up on homebrewing an extra pack - albeit for
external use - I have bought another KXBT2!

73 Stephen, G4SJP

On 24 May 2017 at 22:01, Wayne Burdick  wrote:


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Re: [Elecraft] K1 - VFO frequency range

[Cameron Francey]

Just as an additional note.  I built two K1's last year and even though I wound 
the turns for L1 so they were really tight as I found from experience its much 
easier to spread them out a bit than to compress them again.  In both K1's I 
actually had to remove one turn to get the VFO low enough.  The manual does 
mention this may be needed.


Just though I'd bring that up since I had to do that fairly recently.



Cameron - AF7DK/GM7LQR




From: Elecraft  on behalf of Mike Morrow 

Sent: Wednesday, May 24, 2017 9:04 AM
To: roney; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K1 - VFO frequency range

I assume you have already calibrated the LCD display on each band using the OCF 
menue function.  That makes the LCD indicate the actual transmitter output 
frequency,  This display calibration for each band must be performed before 
adjustment of where the low end of each band starts.

Because the K1 has no way of adjusting the oscillation frequency of the 
individual heterodyne crystals on the filter board, the only band edge 
adjustment possible is accomplished by altering the VFO frequency.  That 
affects both bands equally.

Your data show the K1 tuning band is too low by about 5.2 kHz.  The VFO 
SUBTRACTS from the heterodyne crystal frequency, so to RAISE the K1 frequency 
of operation you must LOWER the VFO frequency by squeezing CLOSER together some 
of the turns on the RF board L1 VFO toroid.  It won't require much.  Try that 
until the low end of 80m indicates about 3499.0 kHz on the LCD.  That 80m L1 
adjustment will also bring the low end of 15m to about 20996.1 kHz.  That will 
be the closest you'll get on 15m.  If you adjusted L1 until 15m starts at 
20999.0, then 80m will start at 3501.9 kHz.  You'll have lost some low end 80m 
coverage.

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[Elecraft] Sub Receiver quits working in Diversity mode

[Rich]

When I put my K3 #3300 FW5.57 into Diversity mode.  The sub receiver 
stops receiving after a few minutes.


If I use the sub receiver as a second receiver (no diversity) the sub RX 
never stops receiving.


Any Ideas?

Rich

K3RWN

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Re: [Elecraft] Diversity and RF/Vol Controls

[Rich]

I think there is an issue with the radio.  I have everything set as 
suggested.   The SubRX works fine as a standalone RXer.   In diversity 
mode I get nothing from the subRX (right speaker)


Rich


On 5/24/2017 19:31 PM, Dale Boresz wrote:

Hello Rich,

I have been using diversity reception on the K3 on 40m for years, and 
can control both RF gains separately, and the AF Gain controls are set 
so that the larger one acts as a balance control, and the smaller one 
acts as a master volume control for both simultaneously (however that 
can be changed to independent AF gain controls if that is your 
preference).


Some of the relevant menu settings (though probably not all) are set 
as follows on my radio:

SQ SUB : 00 (Fully CCW)
SQ MAIN: 00 (Fully CCW)
SUB AF : BALANCE  (for the balance/master gain scenario I described above)
-- or --
SUB AF : nor (to enable individual control of the AF Gain for the Sub 
and the Main RX)


Hope this helps.

73,

Dale - WA8SRA



On Wed, May 24, 2017 at 7:02 PM, Rich > wrote:


Yes SPKRS is set to 2.   I get nothing in my left (sub) speaker
during diversity.   The left spkr works fine when I use the Sub
and Main RXs separately.

rich


On 5/24/2017 18:42 PM, John Nogatch wrote:

...Diversity mode does the Main RF gain and Main AF take
over for both
receivers?  At least that appears to be the case...

Hence the Sub RF gain and Sub AF have no function at that
point?

Check that CONFIG: SPKRS is set to 2
otherwise it will behave as you described.

Also, you need to have 2 speakers, and/or stereo headset.

-John AC6SL
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Re: [Elecraft] Diversity and RF/Vol Controls

[Tom-KQ5S]

I had forgotten about setting the SUB AF to balance.  Thanks for the
reminder.
Is there a macro command that will adjust the balance?  I set the SUB AF to
Balance and the knob on the radio controls the balance.  My macro to set
the SUB AF Gain still sets the gain instead of the balance.


73,
Tom - KQ5S

On Wed, May 24, 2017 at 6:31 PM, Dale Boresz  wrote:

> Hello Rich,
>
> I have been using diversity reception on the K3 on 40m for years, and can
> control both RF gains separately, and the AF Gain controls are set so that
> the larger one acts as a balance control, and the smaller one acts as a
> master volume control for both simultaneously (however that can be changed
> to independent AF gain controls if that is your preference).
>
> Some of the relevant menu settings (though probably not all) are set as
> follows on my radio:
> SQ SUB : 00 (Fully CCW)
> SQ MAIN: 00 (Fully CCW)
> SUB AF : BALANCE  (for the balance/master gain scenario I described above)
> -- or --
> SUB AF : nor (to enable individual control of the AF Gain for the Sub and
> the Main RX)
>
> Hope this helps.
>
> 73,
>
> Dale - WA8SRA
>
>
>
> On Wed, May 24, 2017 at 7:02 PM, Rich  wrote:
>
> > Yes SPKRS is set to 2.   I get nothing in my left (sub) speaker during
> > diversity.   The left spkr works fine when I use the Sub and Main RXs
> > separately.
> >
> > rich
> >
> >
> > On 5/24/2017 18:42 PM, John Nogatch wrote:
> >
> >> ...Diversity mode does the Main RF gain and Main AF take over for both
> >>> receivers?  At least that appears to be the case...
> >>>
> >>> Hence the Sub RF gain and Sub AF have no function at that point?
> >>>
> >> Check that CONFIG: SPKRS is set to 2
> >> otherwise it will behave as you described.
> >>
> >> Also, you need to have 2 speakers, and/or stereo headset.
> >>
> >> -John AC6SL
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Re: [Elecraft] Diversity and RF/Vol Controls

[Dale Boresz]

Hello Rich,

I have been using diversity reception on the K3 on 40m for years, and can
control both RF gains separately, and the AF Gain controls are set so that
the larger one acts as a balance control, and the smaller one acts as a
master volume control for both simultaneously (however that can be changed
to independent AF gain controls if that is your preference).

Some of the relevant menu settings (though probably not all) are set as
follows on my radio:
SQ SUB : 00 (Fully CCW)
SQ MAIN: 00 (Fully CCW)
SUB AF : BALANCE  (for the balance/master gain scenario I described above)
-- or --
SUB AF : nor (to enable individual control of the AF Gain for the Sub and
the Main RX)

Hope this helps.

73,

Dale - WA8SRA



On Wed, May 24, 2017 at 7:02 PM, Rich  wrote:

> Yes SPKRS is set to 2.   I get nothing in my left (sub) speaker during
> diversity.   The left spkr works fine when I use the Sub and Main RXs
> separately.
>
> rich
>
>
> On 5/24/2017 18:42 PM, John Nogatch wrote:
>
>> ...Diversity mode does the Main RF gain and Main AF take over for both
>>> receivers?  At least that appears to be the case...
>>>
>>> Hence the Sub RF gain and Sub AF have no function at that point?
>>>
>> Check that CONFIG: SPKRS is set to 2
>> otherwise it will behave as you described.
>>
>> Also, you need to have 2 speakers, and/or stereo headset.
>>
>> -John AC6SL
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[Elecraft] K3s, FM T, -, repeater setup on 6m

[Clay Autery]

I think I have this right

We have a local 6M repeater.  It's 53.05 receive -1kHz for TX. (52.05). 
Tone set for 186.2

I can hear the station ID
And, I can see where my TX is sending the tone (on the P3).
But no one is hearing me.

Is this because the repeater is using TSql, rather than plain-ole Tone? 
(2 way tone vs. 1 way only)

Am I correct that the K3S will decode but not encode Tone?  (or do I
have it backwards)

Thanks!

-- 
__
Clay Autery, KY5G

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Re: [Elecraft] Diversity and RF/Vol Controls

[Rich]

Yes SPKRS is set to 2.   I get nothing in my left (sub) speaker during 
diversity.   The left spkr works fine when I use the Sub and Main RXs 
separately.


rich


On 5/24/2017 18:42 PM, John Nogatch wrote:

...Diversity mode does the Main RF gain and Main AF take over for both
receivers?  At least that appears to be the case...

Hence the Sub RF gain and Sub AF have no function at that point?

Check that CONFIG: SPKRS is set to 2
otherwise it will behave as you described.

Also, you need to have 2 speakers, and/or stereo headset.

-John AC6SL
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Re: [Elecraft] LiIon types, and safety (was: Fire in the house li-ion)

[Terje Elde]

> On 24 May 2017, at 23:01, Wayne Burdick  wrote:
> 
> 
>> On May 24, 2017, at 1:31 PM, Terje Elde  wrote:
>> 
>> There are LiIons out there (18650 and maybe also 14500) that have built-in 
>> protections against all sorts of things, including both under- and 
>> overvoltage.  That can significantly reduce various risks associated with 
>> them.
> 
> 
> The custom battery pack for the KX2 (KXBT2) is one of these. Our pack 
> includes the protection module inside the shrink-wrap. We allowed for this in 
> dimensioning the radio. 
> 
> We extensively tested 20 prototypes of the battery and charger, and were very 
> thorough in ensuring they were safe to use. That said, we also provide a 
> comprehensive list of guidelines for battery pack charging, storage and use, 
> in the documentation that comes with the pack.

Hi list,

When I did the quick writeup on battery chemistries etc, I was thinking mostly 
about situations where you pick batteries yourself, for external batteries.

While I came out recommending LiFePo4 for that, I didn’t really have internal 
batteries like in the KX2 in mind.  Internal batteries are a different 
ballgame, for the reasons Wayne mentioned.  They’re often matched to a unit, 
provided with a lot of safety features, and then finally protected by a hard 
shell securing the physical package.

Also, LiFePo4s wouldn’t make sense in such a miniaturised setup, due to the 
lower energy density.  You’d trade up in size and weight, or down in runtime.

Such packages as in the KX2, with internal safety features are commonly used by 
a lot of makers with comparatively little knowledge compared to HAMs, and they 
are fairly safe.


LiIon is scary enough to be cautions, but so is lead acid, gasoline, and any 
other high energy density thing.  Stay on the safe side, make good choices and 
buy from reputable brands and vendors, protect things and be careful, and you 
should be just fine.

Terje

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Re: [Elecraft] Diversity and RF/Vol Controls

[John Nogatch]

> ...Diversity mode does the Main RF gain and Main AF take over for both
> receivers?  At least that appears to be the case...
>
> Hence the Sub RF gain and Sub AF have no function at that point?

Check that CONFIG: SPKRS is set to 2
otherwise it will behave as you described.

Also, you need to have 2 speakers, and/or stereo headset.

-John AC6SL
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[Elecraft] Diversity and RF/Vol Controls

[Rich]

I am a bit lost when the radio is in diversity mode.   Once I engage 
Diversity mode does the Main RF gain and Main AF take over for both 
receivers?  At least that appears to be the case.


Hence the Sub RF gain and Sub AF have no function at that point?

Rich
K3RWN
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Re: [Elecraft] LiIon types, and safety (was: Fire in the house li-ion)

[Stephen Prior]

Which is why I've given up on homebrewing an extra pack - albeit for
external use - I have bought another KXBT2!

I have to say though, that I'm still not finding it totally straightforward
getting the two halves of the KX2 back together again after replacing the
battery.  When I received the KX2, the battery wires were pinched between
the case and the edge of the vertical filter board and were already showing
chafing of the insulation.  Having removed and reinstalled the filter board
in installing the ATU, I now no longer have the speaker cables pinched, but
I have to be very careful how I dress the speaker cables before putting the
two halves of the case back together.  I wonder if there could be some
further guidance from Elecraft on this?

On a different topic, having now bought the option which includes the clock
module, I'm looking forward to the firmware update which will provide us
with the logbook data based upon transmitted CW text!  Thanks in
anticipation Wayne!

73 Stephen, G4SJP

On 24 May 2017 at 22:01, Wayne Burdick  wrote:

>
> > On May 24, 2017, at 1:31 PM, Terje Elde  wrote:
> >
> > There are LiIons out there (18650 and maybe also 14500) that have
> built-in protections against all sorts of things, including both under- and
> overvoltage.  That can significantly reduce various risks associated with
> them.
>
>
> The custom battery pack for the KX2 (KXBT2) is one of these. Our pack
> includes the protection module inside the shrink-wrap. We allowed for this
> in dimensioning the radio.
>
> We extensively tested 20 prototypes of the battery and charger, and were
> very thorough in ensuring they were safe to use. That said, we also provide
> a comprehensive list of guidelines for battery pack charging, storage and
> use, in the documentation that comes with the pack.
>
> 73,
> Wayne
> N6KR
>
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Re: [Elecraft] LiIon types, and safety (was: Fire in the house li-ion)

[Wayne Burdick]

> On May 24, 2017, at 1:31 PM, Terje Elde  wrote:
> 
> There are LiIons out there (18650 and maybe also 14500) that have built-in 
> protections against all sorts of things, including both under- and 
> overvoltage.  That can significantly reduce various risks associated with 
> them.


The custom battery pack for the KX2 (KXBT2) is one of these. Our pack includes 
the protection module inside the shrink-wrap. We allowed for this in 
dimensioning the radio. 

We extensively tested 20 prototypes of the battery and charger, and were very 
thorough in ensuring they were safe to use. That said, we also provide a 
comprehensive list of guidelines for battery pack charging, storage and use, in 
the documentation that comes with the pack.

73,
Wayne
N6KR

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[Elecraft] LiIon types, and safety (was: Fire in the house li-ion)

[Terje Elde]

> On 24 May 2017, at 15:20, Richard Fjeld  wrote:
> 
> I had bought a balance charger and a voltage monitor, and low voltage alarms, 
> but I have made battery packs that wouldn’t be practical to  attach a monitor 
> to.  Example, I have an old Kenwood hand-held that hasn’t had a battery pack 
> for years.   Now, for a few dollars,  I had made a battery pack for it.
> 
> I also have CREE flashlights made for the 18650, and 14500 batteries.  There 
> is no way to monitor the voltage in this application.  I tested one yesterday 
> and found it was down to 2.0 volts.

There are LiIons out there (18650 and maybe also 14500) that have built-in 
protections against all sorts of things, including both under- and overvoltage. 
 That can significantly reduce various risks associated with them.

There are a few downsides:
 - They can be longer, might not fit in all equipment
 - They can have current-limits, typically not a problem with flashlights, but 
can be with higher power radios (a few amps is certainly fine, I’d expect no 
issues for QRP).
 - They can appear “dead” if the voltage ever drops too low.

About the last part…  Sorry if it’s been already mentioned in this thread, but 
LiIons can become more dangerous if they stay completely depleted for a long 
time.  Best for storage of regular LiIons is probably around 3.6V, but if you 
have a choice between fully charged or fully depleted, go with the fully 
charged.

> (Also being marketed today, are packs to jump-start cars and trucks. That 
> will be interesting!)
> 
> This thread has made gel-cells look pretty good to me again.

There’s a lot of different chemistries when it comes to LiIon batteries, and 
they each have different tradeoffs.

If you’d like to gain a little bit in safety, consider IMR, INR or NCR 
batteries.  They are intrinsically a bit less scary than some of the other 
chemistries, like ICR.  Googling a battery will typically lead you to a data 
sheet about this kind of information.  Not only is it harder to get an incident 
from these, but the incident would be less severe as well.

All of those batteries operate with the same voltage range, but the mentioned 
types typically have a bit less capacity (for an 186500, that might be 2000 - 
3000mAh, where ICR can be up towards 3400mAh).  Those batteries can often 
provide more current safely though, and can also have less of a voltage drop.  
That in turn, means you won’t get to battery low as fast (caused by the voltage 
having dropped low enough).  Bottom line to that is that at higher currents 
(couple of amps and up) you might get similar real runtime from a 3000mAh IMR 
battery, as from a 3400mAh ICR battery.

Then there’s LiFePo4.  These have a different (lower) voltage range, and you’d 
need a charger with specific support for them.  That used to be a problem, but 
it’s not anymore.  You can find chargers in all price ranges for these.

They are a lot safer than other Li-chemistries, and they’ll survive something 
like 10 times the number of cycles (ballpark of 2000 vs 200).  They can often 
support a higher current, they’re more forgiving on overcharging, and so on and 
so forth.  You’re paying the same tradeoff as the other chemistries though, 
with less energy density, but better safety and higher current.

They do have another property that makes them really nice for radios though, 
which is a fairly flat discharge curve, spending most of their time around 
3.2V.  Four of them in series would give you about 12.8V for most of the 
discharge, a much better voltage for our needs, than “regular” LiIon which 
would be between 9.9V and 12.6V for a 3-cell, or 13.2V and 16.8V for a 4-cell 
battery.


Yeah, Li-batteries can be scary, but so can any other high concentration of 
energy.  If you pick your cells carefully, protect them physically and 
electrically (charging, usage, fuse, etc), keep a watchful eye on them 
(temperature?  signs of damage?), then you can greatly reduce any risk, even to 
a lower level than the LiPo you probably have in your cellphone.


Personally I’m probably going to go with 18650 or 26650 LiFePo4 batteries, two 
packs of 4S1P.  Just haven’t decided yet if I want a read made pack, or if I 
want to set the pack up myself.  The latter would probably allow for easier 
removal of the cells, to charge them externally.

For those of you in Europe, nkon.nl is a trusted supplier with good prices 
(though currently not shipping to Norway last I checked)..

73,
Terje Elde / LB8KH

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Re: [Elecraft] Choking KPA500 and testing a box of unknown chokes

[Bill Leonard N0CU]

Jim,

I apologize: I made a typo in my post. It should have said "...the highest
choking IMPEDANCE is usually obtained with an air core choke (coax looped
with or without some form like PVC)". Maybe this is an over-statement, but
of the few chokes I have tested, air core chokes made with just standard
coax have shown the highest net impedance, but also the narrowest useable BW
because of the high Q. I have seen these baluns used in countless QST
articles over the years, and even as part of some commercial antenna
designs.

In my previous posts, I tried to emphasize that choosing a choke to reduce
common mode current needs to be a system level process. Because of the
importance of the resonance problem, I explicitly stated that adding a choke
can either reduce, have no effect on, or increase the common mode current. I
appreciate the points you make regarding the use of a ferrite core that
yields wide BW and high resistance. However, there are those that argue
against this approach by claiming that there is no need to burn up the
common mode energy in the choke resistance, when you could just as easily
use a high reactance choke to reflect it and re-radiate it out the antenna.
However, the proponents of this approach either don’t discuss the potential
resonance problem, or state that as long as the choke’s resistive component
is greater than 5x the antenna feed impedance, you don’t need to worry about
it.

Bill  N0CU




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Re: [Elecraft] Choking KPA500 and testing a box of unknown chokes

[Eric Swartz - WA6HHQ, Elecraft]

Folks - we are now at 10 posts in a storp period on this OT thread.

Let's close the thread now in the interest of lowering email overload for our 
other readers. Please take it to direct email as needed.


73,
Eric
Moderator
/elecraft.com/


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Re: [Elecraft] Choking KPA500 and testing a box of unknown chokes

[Jim Brown]

On Wed,5/24/2017 9:39 AM, Bill Leonard N0CU wrote:

Two of the
main trade offs are bandwidth and choking impedance. The  highest choking BW
is usually obtain with an air core choke (coax looped with or without some
form like PVC). However, this approach is very high Q, which yields
relatively low R and narrow BW.


Bill,

This simple-minded analysis is WRONG because it fails to realize the 
fact that the choke is adding inductance to a part of the antenna (the 
transmission line as a common mode conductor). It is, in fact, no 
different from adding a loading coil to an antenna to resonate it! At 
some frequencies, that transmission line will look capacitive, and at 
those frequencies, the added inductance causes the line to resonate, 
INCREASING common mode current rather than reducing it.


Think about it -- how is this air core inductor different from a loading 
coil that we add to the base of a short vertical to resonate it?  Using 
your logic, that loading coil ought to block the current, but we all 
know that it does not.


THIS fundamental principle is why air core chokes DON'T work in many 
systems. That is, they don't choke common mode current. Now, the ANTENNA 
works to the extent that it radiates (and may yield a fine SWR, which is 
NOT a measure of how well the antenna works), so users think the choke 
is fine.


The virtue of chokes wound on lossy ferrite cores is that by using a 
suitable number of turns, the choke, with the stray C between turns and 
the loss (resistance) coupled from the core forms a parallel resonant 
circuit with a very low Q, and with a high value of resistance at 
resonance. And the low Q (typically on the order of 0.5) makes that 
resonance quite broad so that it can cover multiple ham bands. In 
addition, #31 material have a second dimensional resonance below 3 MHz 
that broadens the choking Z curve much as did stagger-tuned" IF stages. 
That large value resistance reduces common mode current -- it can never 
"resonate" with the antenna (transmission line) into which it is inserted.


This, and other concepts associated with common mode chokes are 
articulated in a tutorial that is on my website, and was added to the 
ARRL Handbook in 2010.


73, Jim K9YC

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Re: [Elecraft] Choking KPA500 and testing a box of unknown chokes

[Bill Leonard N0CU]

Mike,

Wes raises one of the many interesting aspects of balun design, and not
surprisingly, one that there doesn't appear to be a consensus on. Two of the
main trade offs are bandwidth and choking impedance. The  highest choking BW
is usually obtain with an air core choke (coax looped with or without some
form like PVC). However, this approach is very high Q, which yields
relatively low R and narrow BW. I recently tested on of these that was
centered at 14 MHz (by adjusting the number of turns and loop diameter) and
the BW was only around 2-3 MHz. At the other end of the design spectrum is
the sleeve balun, which has a very broad BW (1-30 MHz), but it has a
relatively low impedance, which is almost entirely resistive. 

Some say to go for the maximum reactance and minimum resistance, others say
go for a net impedance of greater than 1K (or 5K depending on the "expert).
Then there is also the issue of power dissipation which I haven't even
touched on.

So, which balun type you need is driven by what you want the balun to do.
Feel free to contact me off line if you would like some more details.

Bill N0CU



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Re: [Elecraft] K1 - 2 band, is possible to add another 2 band PCB ?

[Mike Morrow]

Between 2002 and 2014 Elecraft made a four-band filter board KFL1-4 which 
allowed operation on 40m, 30m, and any two of 20m, 17m, and 15m.  It had 
superior RF performance on each band compared to equivalent two-band filter 
boards.  The unavailability of special temperature-stable trimmer capacitors 
forced its discontinuation.  It was a gem, after its design was altered to use 
those capacitors, and backfit kits to older boards became availble.

So when you read of a four-band K1, the discontinued KFL1-4 is what made it 
possible.

Mike / KK5F

-Original Message-
>From: roney 
>Sent: May 24, 2017 9:08 AM
>To: elecraft@mailman.qth.net
>Subject: [Elecraft] K1 - 2 band, is possible to add another 2 band PCB ?
>
>Hello, now that my Rig is ready, I want to ask something that wasn't clear
>when I bought it.
>
>In Elecraft website, there is a "*KFL1-2
> Additional 2 Band Module*";
>I did not buy it, because I still don't know if it works.
>
>I already have B1 as 3.500 mhz
>I already have B2 as 21.000 mhz
>
>If I buy and add the second 2 band module, can I have all together 4 bands
>in my Rig ?
>(Like adding B3 as 14.000 mhz, and B4 as 7.000 mhz)
>
>Thanks
>Roney PY1ZB

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Re: [Elecraft] K1 - 2 band, is possible to add another 2 band PCB ?

[Don Wilhelm]

Roney,

When you change band boards, you will have to enter the menu and change 
the "b1" and "b2" parameters to match whichever bands you have on the board.

b3 and b4 are only for the 4 band board which is no longer available.
The 2 band board only allows "b1" and "b2".

The K1 does remember the CAL OPF offsets for up to 6 bands, so if you 
set that up initially, you will have correct calibration and frequency 
display.


73,
Don W3FPR

On 5/24/2017 10:08 AM, roney wrote:

Hello, now that my Rig is ready, I want to ask something that wasn't clear
when I bought it.

In Elecraft website, there is a "*KFL1-2
 Additional 2 Band Module*";
I did not buy it, because I still don't know if it works.


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Re: [Elecraft] Clever K3s cooling scheme?

[Ron D'Eau Claire]

Right, Roy. It's a whole different cooling system. The K2 has an EXTERNAL
heat sink. The fan assists by cooling the components inside the KPA100 amp,
pushing air in across the components and out through holes around the
forward edge of the heat sink. The heat sink fins are on top of the K2 in
open air.

As you note, the fans exhaust warm air from the heat sink inside the K3 out
through the back.  

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Roy
Koeppe
Sent: Wednesday, May 24, 2017 5:36 AM
To: Elecraft@mailman.qth.net
Subject: [Elecraft] Clever K3s cooling scheme?

Re all the fans postings, it appears my K3s uses convection cooling during
light usage periods, drawing air in at the rear, backwards thru the idle
fans, and out the top. When fans engage, air flow is reversed...drawn in
thru the top and out the back. "Simplicity is ingenuity."

73,   Roy   K6XK 


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Re: [Elecraft] K1 - VFO frequency range

[Mike Morrow]

I assume you have already calibrated the LCD display on each band using the OCF 
menue function.  That makes the LCD indicate the actual transmitter output 
frequency,  This display calibration for each band must be performed before 
adjustment of where the low end of each band starts.

Because the K1 has no way of adjusting the oscillation frequency of the 
individual heterodyne crystals on the filter board, the only band edge 
adjustment possible is accomplished by altering the VFO frequency.  That 
affects both bands equally.

Your data show the K1 tuning band is too low by about 5.2 kHz.  The VFO 
SUBTRACTS from the heterodyne crystal frequency, so to RAISE the K1 frequency 
of operation you must LOWER the VFO frequency by squeezing CLOSER together some 
of the turns on the RF board L1 VFO toroid.  It won't require much.  Try that 
until the low end of 80m indicates about 3499.0 kHz on the LCD.  That 80m L1 
adjustment will also bring the low end of 15m to about 20996.1 kHz.  That will 
be the closest you'll get on 15m.  If you adjusted L1 until 15m starts at 
20999.0, then 80m will start at 3501.9 kHz.  You'll have lost some low end 80m 
coverage.

The K1 has been around since 2000, which is how long I've had #175.  What's the 
serial on your recent K1?  It's still a magnificent radio.

Mike / KK5F

-Original Message-
>From: roney 
>Sent: May 24, 2017 7:52 AM
>To: elecraft@mailman.qth.net
>Subject: [Elecraft] K1 - VFO frequency range
>
>Hello, I just finished all tests and adjustments in my K1.
>It works great. I have 2 filter band as 80m and 15m.
>It's transmitting and receiving very well.
>
>I followed all tests in:
>
>VFO Range Test (Page 38):
>VFO knob fully clockwise = 3.007 khz
>VFO knob fully counterclockwise = 3.091 khz
>VFO range = 84 khz
>
>So I did Band Assignments (Page 39), etc, etc.
>
>When seeing each band, my real ranges are:
>
>80m: 3.493,8   to  3.577,6 mhz
>15m: 20.990,9 to 21.074,6 mhz
>
>I did not understand how to adjust these low and high limits. Should I
>change some inductor turns ? or is there any menu adjust for these limits ?
>
>Thanks for the help,
>Roney Monte PY1ZB
>__

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[Elecraft] Feature request

[Arthur Nienhouse]

*/I would like to see Band Stacking Register using the Band buttons on 
the amp's

Regards
Art
ka9zap
/*
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Re: [Elecraft] K1 - 2 band, is possible to add another 2 band PCB ?

[Detrick Merz]

All 4 bands cannot be installed at the same time. If you buy the second 2
band module for 20/40 you will have to remove the 80/15 module to install
the 20/40. You will also need to reprogram B1 to 14 and B2 to 7. Every time
you remove one band module and install another you should go through the
menu to change B1 and B2 to match the installed module.

73,

-detrick
KI4STU

On Wed, May 24, 2017 at 10:08 AM, roney  wrote:

> Hello, now that my Rig is ready, I want to ask something that wasn't clear
> when I bought it.
>
> In Elecraft website, there is a "*KFL1-2
>  Additional 2 Band
> Module*";
> I did not buy it, because I still don't know if it works.
>
> I already have B1 as 3.500 mhz
> I already have B2 as 21.000 mhz
>
> If I buy and add the second 2 band module, can I have all together 4 bands
> in my Rig ?
> (Like adding B3 as 14.000 mhz, and B4 as 7.000 mhz)
>
> Thanks
> Roney PY1ZB
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>
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Re: [Elecraft] Clever K3s cooling scheme?

[Wayne Burdick]

Thanks for noticing, Roy :)

Wayne
N6KR


> On May 24, 2017, at 5:36 AM, Roy Koeppe  wrote:
> 
> Re all the fans postings, it appears my K3s uses convection cooling during 
> light usage periods, drawing air in at the rear, backwards thru the idle 
> fans, and out the top. When fans engage, air flow is reversed...drawn in thru 
> the top and out the back. "Simplicity is ingenuity."
> 
> 73,   Roy   K6XK 


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Re: [Elecraft] K3/K3S with KXV3B Feature request

[Wayne Burdick]

Hi Mike,

Excellent idea. This should be a simple change to the K3/K3S firmware. 

73,
Wayne
N6KR


> On May 24, 2017, at 6:22 AM, M Cresap  wrote:
> 
> Wayne/Eric
> 
> I'd like to use a lower net gain (on receive) transverter with a K3/K3S. The 
> transverter IF frequency is 28 MHz. Would it be possible to selectively 
> enable Preamp 2 of the KXV3B during transverter operation? Moving the 
> transverter receive line to "Rx ant. in" and selecting Preamp 2 should result 
> in improved sensitivity (with related change in dynamic range).
> 
> Thanks
> 
> 73, Mike, W3IP
> 

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[Elecraft] K1 - 2 band, is possible to add another 2 band PCB ?

[roney]

Hello, now that my Rig is ready, I want to ask something that wasn't clear
when I bought it.

In Elecraft website, there is a "*KFL1-2
 Additional 2 Band Module*";
I did not buy it, because I still don't know if it works.

I already have B1 as 3.500 mhz
I already have B2 as 21.000 mhz

If I buy and add the second 2 band module, can I have all together 4 bands
in my Rig ?
(Like adding B3 as 14.000 mhz, and B4 as 7.000 mhz)

Thanks
Roney PY1ZB
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[Elecraft] K3/K3S with KXV3B Feature request

[M Cresap via Elecraft]

Wayne/Eric
I'd like to use a lower net gain (on receive) transverter with a K3/K3S.The 
transverter IF frequency is 28 MHz. Would it be possible to selectively enable 
Preamp 2 of the KXV3B during transverteroperation? Moving the transverter 
receive line to "Rx ant. in" andselecting Preamp 2 should result in improved 
sensitivity (with related changein dynamic range).
Thanks
73, Mike, W3IP
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Re: [Elecraft] K1 - VFO frequency range

[Don Wilhelm]

Roney,

There is no adjustment for individual bands.

If you have no other band boards, you can adjust the turns on L1 to 
bring the lower end of 80 meters up to 3.500 MHz.


Normally, the VFO range is adjusted so that all bands will tune a bit 
below the low frequency limit.  This compensates for slight variation of 
the exact frequency of the crystal on the band board.


If you have multiple band boards, check to see which band is closest to 
the lower ham band and adjust the turns spacing of L1 to bring that band 
near the lower edge of the band.


73,
Don W3FPR

On 5/24/2017 8:52 AM, roney wrote:



So I did Band Assignments (Page 39), etc, etc.

When seeing each band, my real ranges are:

80m: 3.493,8   to  3.577,6 mhz
15m: 20.990,9 to 21.074,6 mhz

I did not understand how to adjust these low and high limits. Should I
change some inductor turns ? or is there any menu adjust for these limits ?

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Re: [Elecraft] Fire in the house li-ion

[Richard Fjeld]

Just a note to say I’m still thinking about the information from this thread, 
and I’m glad to learn of fires while a Lithium type battery discharges.  I had 
no idea they would do that, and it takes the fun out of having them.

I had bought a balance charger and a voltage monitor, and low voltage alarms, 
but I have made battery packs that wouldn’t be practical to  attach a monitor 
to.  Example, I have an old Kenwood hand-held that hasn’t had a battery pack 
for years.   Now, for a few dollars,  I had made a battery pack for it.

I also have CREE flashlights made for the 18650, and 14500 batteries.  There is 
no way to monitor the voltage in this application.  I tested one yesterday and 
found it was down to 2.0 volts.

(Also being marketed today, are packs to jump-start cars and trucks. That will 
be interesting!)

This thread has made gel-cells look pretty good to me again.

Thanks to all,

Rich, n0ce

From: Bill Tippett
Sent: Friday, May 19, 2017 1:31 PM
To: Terry Schieler
Cc: Elecraft Reflector
Subject: Re: [Elecraft] Fire in the house li-ion

Ditto Terry's comments.  I'd add that balanced chargers (<$20) and
inexpensive monitors (<$3) will detect when a cell begins going bad.  One
cell having a much lower voltage than the others is an immediate flag.

http://www.ebay.com/itm/IMax-B6-Digital-LCD-RC-Lipo-NiMh-
battery-Balance-Charger-US-STOCK-100-New-/311592092378?
hash=item488c5602da:g:mmsAAOSwdpxUWyl3

http://www.ebay.com/itm/Lipo-Battery-Voltage-Monitor-Meter-
7-4V-11-1V-22-2V-2S-6S-Cells-LED-Display-/110762643408?
hash=item19c9f7cfd0:g:GQ4AAOxyqKVRigvv

I also never put any lithium battery (LiPO or Li-Ion) inside my radios.
I've seen more bad publicity about Li-Ion batteries (e.g. Samsung S7
phones, Dell laptops, etc) than LiPO batteries but I'm not sure why that is.

73,  Bill  W4ZV


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[Elecraft] K1 - VFO frequency range

[roney]

Hello, I just finished all tests and adjustments in my K1.
It works great. I have 2 filter band as 80m and 15m.
It's transmitting and receiving very well.

I followed all tests in:

VFO Range Test (Page 38):
VFO knob fully clockwise = 3.007 khz
VFO knob fully counterclockwise = 3.091 khz
VFO range = 84 khz

So I did Band Assignments (Page 39), etc, etc.

When seeing each band, my real ranges are:

80m: 3.493,8   to  3.577,6 mhz
15m: 20.990,9 to 21.074,6 mhz

I did not understand how to adjust these low and high limits. Should I
change some inductor turns ? or is there any menu adjust for these limits ?

Thanks for the help,
Roney Monte PY1ZB
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[Elecraft] Clever K3s cooling scheme?

[Roy Koeppe]

Re all the fans postings, it appears my K3s uses convection cooling during 
light usage periods, drawing air in at the rear, backwards thru the idle 
fans, and out the top. When fans engage, air flow is reversed...drawn in 
thru the top and out the back. "Simplicity is ingenuity."


73,   Roy   K6XK 



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Re: [Elecraft] Elecraft] KX2 Firmware

[Charlie T, K3ICH]

Oh Boy, a new subject to create endless comments.

Things WERE starting to die down a tad.

Chas

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred
C. Jensen
Sent: Wednesday, May 24, 2017 12:42 AM
To: Chris Tate ; kev...@coho.net;
elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft] KX2 Firmware

I missed the FW release, I was busy sharpening my sword and degreasing my
chain mail.

Fred K6DGW
Sparks NV

Chris Tate - N6WM  wrote:
>That's a busted exchange copy..  ;-).
>
>-Original Message-
>From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
>kev...@coho.net
>Sent: Tuesday, May 23, 2017 5:43 PM
>To: elecraft@mailman.qth.net
>Subject: Re: [Elecraft] KX2 Firmware
>
>I must be getting old.  I really don't remember what I was doing in the
11th century.
>
>73,
>
> Kevin.  KD5ONS
>
>
>On 5/23/2017 5:38 PM, Tom Francis, W1TEF wrote:
>> Greetings,
>>
>> I was just looking at the KX2 firmware, Beta and 2.69 and discovered 
>> that they were built and released in the 11th Century!! Who knew?!?
>>
>> **MCU 2.69 / DSP 1.49, Final Release Feb 5, 1017**
>>
>> **MCU 2.75 / DSP 1.49, April 7, 1017
>>
>> **Best regards,
>>
>> Tom, W1TEF
>> Lexington, SC
>
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>k6...@foothill.net
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