[Elecraft] Wanted: KXV3

[Wayne Carlson, K2DT]

Has anyone who upgraded to a newer version have an old KXV3 for sale cheap?
I just want to get the IF out.  If I can't find a cheap card I'll end up
building a cable to do the same.

 

Tnx & 73, Wayne K2DT

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Re: [Elecraft] Question about my KX2

[Don Wilhelm]

Paul,

I suspect you have an antenna system problem rather than a KX2 problem. 
Operate the KX2 into a dummy load as David Shoaf has suggested to verify 
that it is working as expected.


The fact that your doublet is fed with "450 ohm" parallel transmission 
line does not mean that you will be feeding 450 ohms.
The characteristic impedance of the feedline and the impedance to be 
matched at the shack end depends NOT on the feedline characteristic 
impedance, but the length of the feedline and the impedance presented at 
the antenna.  That will change from band to band.  It can range from a 
very low impedance to a high impedance.  There are a lot of variables 
such as the length of your doublet, the length of the feedline, and the 
frequency.


As has been said, most 9:1 transformers are Ununs (autotransformers) and 
not a balun at all.


A proper balun would better be termed a common mode choke which will 
minimize the common mode RF on the coax.  Place it at the junction of 
the parallel feedline and the coax coming into the shack.  I would 
suggest the Elecraft BL2 which is switchable between a 1:1 and a 4:1 
configuration.  Use whichever setting gives the least "tuning activity" 
to the ATU.


73,
Don W3FPR



On 8/15/2017 6:53 PM, Paul Smith wrote:

I have and love my KX2 serial number 855. Lately the ATU seems to be "turning loose 
of the setting" I usually can hit the tune button again and get it to tune. I use a 
doublet at 50 ft fed with 450 ohm line and a home brew balun/ Unun. I question the balun 
as when I ordered,  the wrong cores came and I wound the balun which was supposed to be a 
9:1.


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Re: [Elecraft] Question about my KX2

[Paul Smith]

Ok Thanks for the things to check. I will do this in the morning.

Thanks

Paul Smith N0NBD


Sent from Outlook



From: elecraft-boun...@mailman.qth.net  on 
behalf of David Shoaf 
Sent: Wednesday, August 16, 2017 12:03 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Question about my KX2

Paul,  eliminate some of the variables to isolate the problem:

- Use a dummy load and step through the KX2 bands to be sure it can transmit
directly into it.  Use the TUNE button to get that done.  Make sure the
internal antenna tuner is set to BYP mode.

- Then, add in the transmission line with the dummy load terminating it.
Remove the hand-built balun to do this so you're testing the line only.

- Then, add in the balun and retest on all bands but connect it directly to
the KX2 and terminate the other end with a dummy load.  This allows you to
test it by itself.  It better read 1:9 or 9:1 depending on how it is
connected.

- Lastly, add the transmission line and the balun together and then connect
the dummy load to the output of it.  Be sure you're stepping through all the
bands when you do this, too.

As you can see, isolating the items will help you determine where, if any,
there's a problem.  It isn't appropriate to jump to conclusion - yet -
there's a problem with the KX2.   Eliminate all that is known to work
properly and you'll have your answer.

Cheers,

David



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Re: [Elecraft] Question about my KX2

[Brian Hunt]

Most 9:1 designs are UNUNs - unbalanced to unbalanced. For feeding a window 
line fed doublet, you definitely want a BALUN - balanced to unbalanced. The 
doublet / window line is a balanced system. The output connector on the KX2 is 
unbalanced. 

If you are using an UNUN in this setup you you may be getting RF on the KX2 
case which, when you touch it, may cause the tuner to do what you are seeing. 

The Elecraft BL2 is a great solution for this application since you can choose 
either 1:1 or 4:1 to see which one makes the ATU the happiest. Or you can roll 
your own but it needs to be a BALUN. 

GL & 73,
Brian, K0DTJ
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Re: [Elecraft] [K2] Sensitivity Spec

[Don Wilhelm]

Steve,

Typically, the receiver is limited by the noise floor, so the MDS will 
not change much whether the preamp is on or off.  While the preamp will 
increase the strength of the signals, it also adds to the noise floor.


Generally a transverter will have a low noise preamp with plenty of 
gain, so there is usually no advantage in running the transceiver with 
the preamp on.  Use your ears while listening to a strong signal to see 
if you can detect overload of the receiver preamp - if so turn it off, 
but if there is no overload distortion, you can leave it on.


Typical MDS measurements are made at 500 Hz.
I typically do a quick test of the sensitivity of K2s that I repair.  A 
-130dBm signal should be detectable above the receiver noise floor.  For 
that test, I have observed that it makes little difference whether the 
preamp is on or off.  So I would suggest you test whether strong signal 
performance is better with the preamp on or off.  My wager is that you 
will choose to leave it off unless your transverter(s) have negative 
gain on RX.


73,
Don W3FPR

On 8/15/2017 4:10 PM, Steve Kavanagh via Elecraft wrote:

I'm just trying to evaluate if I have the gain distribution right for a K2 used 
as an IF for a 10 GHz transverter, through a 2 m transverter mounted inside the 
QRP top.  The K2 manual gives a specification for the MDS but fails to define 
the bandwidth at which it is measured.  Sherwood's receiver table lists some 
measured values at 500 Hz bandwidth but fails to note whether the preamp is on 
or off for these measurements.  So I am not quite sure what the sensitivity 
should be.

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Re: [Elecraft] Question about my KX2

[David Shoaf]

Paul,  eliminate some of the variables to isolate the problem:

- Use a dummy load and step through the KX2 bands to be sure it can transmit
directly into it.  Use the TUNE button to get that done.  Make sure the
internal antenna tuner is set to BYP mode.

- Then, add in the transmission line with the dummy load terminating it. 
Remove the hand-built balun to do this so you're testing the line only.

- Then, add in the balun and retest on all bands but connect it directly to
the KX2 and terminate the other end with a dummy load.  This allows you to
test it by itself.  It better read 1:9 or 9:1 depending on how it is
connected.

- Lastly, add the transmission line and the balun together and then connect
the dummy load to the output of it.  Be sure you're stepping through all the
bands when you do this, too.

As you can see, isolating the items will help you determine where, if any,
there's a problem.  It isn't appropriate to jump to conclusion - yet -
there's a problem with the KX2.   Eliminate all that is known to work
properly and you'll have your answer.

Cheers,

David



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Re: [Elecraft] Remote computer won't communicate with K3 after re-installing Windows 10

[Jim Reisert AD1C]

Problem solved!

Apparently, the default FTDI driver that Windows 10 installs is from
2013 and just isn't good enough for this application.
I installed the latest FTDI driver that the K3 web site pointed to and
all is well now.

-- 
Jim Reisert AD1C, , http://www.ad1c.us
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Re: [Elecraft] RX antenna protection

[john]

I am aware of the RFI warning however to me there is a huge difference
between detecting RFI and protecting the expensive transceiver from RF
damage.  Apparently the K3S does both.

John KK9A

Bob McGraw K4TAX wrote: 
Tue Aug 15 11:59:04 EDT 2017

See page 63 of the manual.  Also page 70 under Receive."*HI RFI* 
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive 
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable 
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, john at kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A

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[Elecraft] Question about my KX2

[Paul Smith]

I have and love my KX2 serial number 855. Lately the ATU seems to be "turning 
loose of the setting" I usually can hit the tune button again and get it to 
tune. I use a doublet at 50 ft fed with 450 ohm line and a home brew balun/ 
Unun. I question the balun as when I ordered,  the wrong cores came and I wound 
the balun which was supposed to be a 9:1.

This may not be enough information but the manual has not offered me much as I 
have done some reading.

Any thoughts out there? Does it need to go to California to be looked into? 
This is my first ATU.

 Thanks in advance de Paul Smith N0NBD


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[Elecraft] Rx antenna protection

[Phillip Zminda]

Paul,

I have used a BOG, a Pixel Loop and a Wellbrook loop receiving antennas. The 
BOG was ok but signal levels were very low and it needed a preamp. The BOG 
needs a lot of tweaking and good grounds at both ends. K1FZ is the expert on 
BOGs and can provide a wealth of information as well as custom transformers. I 
used it one winter but didn’t want to leave in the yard when mowing season 
started. The Pixel loop worked fairly well but I sold it and got a Wellbrook 
ALA 1530, which I think has a cleaner design. The Wellbrook works quite well at 
reducing the noise level. The signal levels are lower but with much reduced 
noise. My loop rotor died and it’s in a fixed position but at about a 6 ft. 
height it doesn’t seem highly directional. I think the Wellbrook is still 
cheaper than the Pixel. Andrew Ikin at Wellbrook is very helpful in answering 
any questions about loop applications 

My receive antenna is far enough from the transmit antenna that I have never 
had any issues with the COR activating, even at 500 watts.

Good luck with your choice.

Phil 
N3ZP
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Re: [Elecraft] RX antenna protection

[Ignacy Misztal]

This is my experience. Making a large-signal preamp is usually a waste of
power since it is a mixer that is a limiting factor.
I can believe that a device from DX Engineering can be poorly designed.
Have NCC-2.  Weighs like a tank but fragile like a baby.
Ignacy, NO9E

On Tue, Aug 15, 2017 at 3:59 PM, Vic Rosenthal  wrote:

> I disagree. A good preamp like the DXE preamps can handle large signals
> and still be linear. That means they can output a lot of power. Do not
> assume you are safe if there is a preamp unless it is a lousy one!
>
> Vic 4X6GP
>
> > On 15 Aug 2017, at 18:07, Ignacy  wrote:
> >
> > If a receive antenna has a preamp, there no need to do any antenna guard
> > since the preamp cannot destroy K3.
> >
> > I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit
> > antennas. None was turned off during transmit.  Both have preamps and
> > nothing was damaged despite running a  KW. Of all 3, K7TJR was the best
> by
> > far.
> >
> > BTW, the RX ANT input in K3 is protected by a RF activated relay.
> >
> > Ignacy, NO9E
>
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Re: [Elecraft] RX antenna protection

[Dave Sublette]

I had one once.  It was a tremendous TVI generator….  

K4TO
> On Aug 15, 2017, at 4:07 PM, KENT TRIMBLE  wrote:
> 
> The Johnson 250-39 and B 380 T/R switches both had a certain amount of 
> "suck-out" but they did protect tube receivers.
> 
> I had both (still do) and preferred the Johnson.
> 
> http://wireless-girl.com/Projects/TRswitches/Johnson/
> 
> Note the warning about use with solid-state equipment, however.
> 
> 73,
> 
> Kent  K9ZTV
> 
> 
> 
> On 8/15/2017 11:58 AM, someone wrote:
>> Just a note to say that years ago, I had a B Electronic Antenna Switch (I 
>> think it was called) that had one or two tubes in it.
>> It worked perfectly to bias the receive completely and immediately as soon 
>> as transmit was detected.  It allowed full break-in for CW work.  I would 
>> like to see something like this again today in solid state.  I think this 
>> would be the ticket for what you need. I haven’t looked, so I don’t know if 
>> anyone is marketing such a device.
>> 
>> 
> 
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[Elecraft] [K2] Sensitivity Spec

[Steve Kavanagh via Elecraft]

I'm just trying to evaluate if I have the gain distribution right for a K2 used 
as an IF for a 10 GHz transverter, through a 2 m transverter mounted inside the 
QRP top.  The K2 manual gives a specification for the MDS but fails to define 
the bandwidth at which it is measured.  Sherwood's receiver table lists some 
measured values at 500 Hz bandwidth but fails to note whether the preamp is on 
or off for these measurements.  So I am not quite sure what the sensitivity 
should be.  

Can anyone clarify?

73,
Steve VE3SMA
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Re: [Elecraft] RX antenna protection

[KENT TRIMBLE]

The Johnson 250-39 and B 380 T/R switches both had a certain amount of 
"suck-out" but they did protect tube receivers.


I had both (still do) and preferred the Johnson.

http://wireless-girl.com/Projects/TRswitches/Johnson/

Note the warning about use with solid-state equipment, however.

73,

Kent  K9ZTV



On 8/15/2017 11:58 AM, someone wrote:

Just a note to say that years ago, I had a B Electronic Antenna Switch (I 
think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as 
transmit was detected.  It allowed full break-in for CW work.  I would like to 
see something like this again today in solid state.  I think this would be the 
ticket for what you need. I haven’t looked, so I don’t know if anyone is 
marketing such a device.




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Re: [Elecraft] RX antenna protection

[Vic Rosenthal]

I disagree. A good preamp like the DXE preamps can handle large signals and 
still be linear. That means they can output a lot of power. Do not assume you 
are safe if there is a preamp unless it is a lousy one!

Vic 4X6GP 

> On 15 Aug 2017, at 18:07, Ignacy  wrote:
> 
> If a receive antenna has a preamp, there no need to do any antenna guard
> since the preamp cannot destroy K3. 
> 
> I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit
> antennas. None was turned off during transmit.  Both have preamps and
> nothing was damaged despite running a  KW. Of all 3, K7TJR was the best by
> far. 
> 
> BTW, the RX ANT input in K3 is protected by a RF activated relay.  
> 
> Ignacy, NO9E
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Re: [Elecraft] RX antenna protection

[Vic Rosenthal]

I'm using a Pixel Loop. Advantages are that it is small, can be rotated to null 
a noise source, and works on all HF bands. It is vertically polarized, so if 
you have a horizontal antenna you can get a useful diversity effect without too 
much physical separation. It has a built in relay that disconnects it to 
protect your receiver while transmitting. I use diversity almost all the time, 
and it definitely improves copy of CW signals.

Vic 4X6GP 

> On 15 Aug 2017, at 17:01, Mark E. Musick  wrote:
> 
> Paul,
> I use several different receive antennas and use all the ones I am going to
> suggest.
> For your small lot, you didn't say how small, I would look at the Pixel
> loop, K9AY and RBOG.
> I have used these and they work. You can get all three from DX Engineering.
> From ARRAY Solutions there is the Shared Apex Loop. It will take up about
> the same space as a K9AY. I have not used one of these so can't say
> personally how well it works, but people I know that have used them speak
> highly of this antenna.
> You have gotten two good suggestions for front end protection. I use the DX
> Engineering receiver guard model RG-5000. You don't need the RG-5000HD
> unless you're in a contest environment. 
> Keep us posted on your progress.
> 
> 73,
> Mark, WB9CIF
> 
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chuck Milam, N9KY
> Sent: Tuesday, August 15, 2017 1:16 PM
> To: Elecraft Mail List 
> Subject: Re: [Elecraft] RX antenna protection
> 
> Also, check out the DX Engineering Receiver Guard Electronic RF Limiters:
> 
> 
> https://www.dxengineering.com/search/part-type/hf-receive-antenna-system-dev
> ices/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autov
> iew=SKU=Default=Ascending
> 
> ---
> Chuck Milam, N9KY
> n...@arrl.net
> 
>> On Mon, Aug 14, 2017 at 11:07 PM, Drew AF2Z  wrote:
>> 
>> Same situation here: small space and would like to try some low noise 
>> receive antennas. I recently bought an Array Solutions AS-RXFEP rf 
>> limiter to use on the RX Ant port of my K3. Haven't tried it yet but 
>> looks like it will do the job.
>> 
>> 
>> 73,
>> Drew
>> AF2Z
>> 
>> 
>> 
>> 
>>> On 08/14/17 21:48, W1PEF wrote:
>>> 
>>> I am considering a Rx antenna but my property is small and concerned 
>>> about strong signals over powering the receiver. Does the K3S have 
>>> built-in protection?
>>> Does anyone use a loop receive antenna or BOG antenna ... would like 
>>> some recommendations from actual users of receive antennas.
>>> Have the complete K-Line and would like to improve my ability to hear.
>>> Thanks for any advice...
>>> Paul
>>> W1PEF
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Re: [Elecraft] RX antenna protection

[a45wg]

John,
Very sound advice.

I am using a Alpha Delta T33g50 that I picked up at HRO Denver, Co; The 
Red Pittaya antenna (Cobwebb) is 15 feet below the TH-7 which is emitting aprox 
500W. 

It has survived for 12 months so far, which has amazed me.

Regards

Tim, A45WG



> On Aug 15, 2017, at 10:06 PM, John K9UWA  
> wrote:
> 
> We have been operating this way with full break-in for many years using the 
> KD9SV products. First it was just the "Front End Saver" which removes and 
> grounds the incoming rcv antenna from your radio during transmit. As a "Fail 
> Safe" the device also prevents the Amplifier from working by removing the 
> PTT line to the amp if by any chance the relays in the KD9SV device fail to 
> operate. Later it is now incorporated into the various RBOG and other 
> Pre-Amp devices that KD9SV sells... through DX-Engineering. 
> 
> Disclaimer Statement: Yes I am a friend of Gary's. Call me a more than 
> happy customer. I complained many years ago after I fried the front end of 
> my IC-765 radios a couple times and Gary started building these devices. 
> They Work and I am happy. No more blown front ends no more blown 
> pre-amps.
> 
> John k9uwa
> 
>> Just a note to say that years ago, I had a B Electronic Antenna Switch (I
>> think it was called) that had one or two tubes in it. It worked perfectly to
>> bias the receive completely and immediately as soon as transmit was 
>> detected. 
>> It allowed full break-in for CW work.  I would like to see something like 
>> this
>> again today in solid state.  I think this would be the ticket for what you 
>> need.
>> I havenTMt looked, so I donTMt know if anyone is marketing such a device.
>> 
>> Rich, n0ce
> 
> John Goller, K9UWA & Jean Goller, N9PXF 
> Antique Radio Restorations
> k9...@arrl.net
> Visit our Web Site at:
> http://www.JohnJeanAntiqueRadio.com
> 4836 Ranch Road
> Leo, IN 46765
> USA
> 1-260-637-6426
> 
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Re: [Elecraft] RX antenna protection

[John K9UWA]

We have been operating this way with full break-in for many years using the 
KD9SV products. First it was just the "Front End Saver" which removes and 
grounds the incoming rcv antenna from your radio during transmit. As a "Fail 
Safe" the device also prevents the Amplifier from working by removing the 
PTT line to the amp if by any chance the relays in the KD9SV device fail to 
operate. Later it is now incorporated into the various RBOG and other 
Pre-Amp devices that KD9SV sells... through DX-Engineering. 

Disclaimer Statement: Yes I am a friend of Gary's. Call me a more than 
happy customer. I complained many years ago after I fried the front end of 
my IC-765 radios a couple times and Gary started building these devices. 
They Work and I am happy. No more blown front ends no more blown 
pre-amps.

John k9uwa

> Just a note to say that years ago, I had a B Electronic Antenna Switch (I
> think it was called) that had one or two tubes in it. It worked perfectly to
> bias the receive completely and immediately as soon as transmit was detected. 
> It allowed full break-in for CW work.  I would like to see something like this
> again today in solid state.  I think this would be the ticket for what you 
> need.
> I havenTMt looked, so I donTMt know if anyone is marketing such a device.
> 
> Rich, n0ce

John Goller, K9UWA & Jean Goller, N9PXF 
Antique Radio Restorations
k9...@arrl.net
Visit our Web Site at:
http://www.JohnJeanAntiqueRadio.com
4836 Ranch Road
Leo, IN 46765
USA
1-260-637-6426

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Re: [Elecraft] RX antenna protection

[Richard Fjeld]

I just read Ignacy’s post telling that the K3 receive ant input has a RF 
activated relay.  I’m glad to see that.

Rich, n0ce


From: Richard Fjeld
Sent: Tuesday, August 15, 2017 12:00 PM
To: Bob McGraw K4TAX; 
elecraft@mailman.qth.net
Subject: Re: [Elecraft] RX antenna protection

I haven’t been following this, and just noticed it, so I hope I am in sync with 
this.

Just a note to say that years ago, I had a B Electronic Antenna Switch (I 
think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as 
transmit was detected.  It allowed full break-in for CW work.  I would like to 
see something like this again today in solid state.  I think this would be the 
ticket for what you need. I haven’t looked, so I don’t know if anyone is 
marketing such a device.

Rich, n0ce

From: Bob McGraw K4TAX
Sent: Tuesday, August 15, 2017 11:00 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] RX antenna protection

See page 63 of the manual.  Also page 70 under Receive."*HI RFI*
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, j...@kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A
>
> W1PEF wrote
> Mon Aug 14 21:48:29 EDT 2017
>
> I am considering a Rx antenna but my property is small and concerned about
> strong signals over powering the receiver. Does the K3S have built-in
> protection?
> Does anyone use a loop receive antenna or BOG antenna ... would like some
> recommendations from actual users of receive antennas.
> Have the complete K-Line and would like to improve my ability to hear.
> Thanks for any advice...
> Paul
> W1PEF
>
>
> __
> Elecraft mailing list
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Re: [Elecraft] RX antenna protection

[Richard Fjeld]

I haven’t been following this, and just noticed it, so I hope I am in sync with 
this.

Just a note to say that years ago, I had a B Electronic Antenna Switch (I 
think it was called) that had one or two tubes in it.
It worked perfectly to bias the receive completely and immediately as soon as 
transmit was detected.  It allowed full break-in for CW work.  I would like to 
see something like this again today in solid state.  I think this would be the 
ticket for what you need. I haven’t looked, so I don’t know if anyone is 
marketing such a device.

Rich, n0ce

From: Bob McGraw K4TAX
Sent: Tuesday, August 15, 2017 11:00 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] RX antenna protection

See page 63 of the manual.  Also page 70 under Receive."*HI RFI*
warning:"

RFI DET - *NOR *enables detection of high RFI at the antenna in receive
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable
the warning.

73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, j...@kk9a.com wrote:
> Great question! I asked the same thing once and never got an answer so to
> be safe I either short the RX antenna during transmit or if SO2R I use DXE
> receiver guards. It would be nice if the K3S had a similar built in
> protector.
>
> John KK9A
>
> W1PEF wrote
> Mon Aug 14 21:48:29 EDT 2017
>
> I am considering a Rx antenna but my property is small and concerned about
> strong signals over powering the receiver. Does the K3S have built-in
> protection?
> Does anyone use a loop receive antenna or BOG antenna ... would like some
> recommendations from actual users of receive antennas.
> Have the complete K-Line and would like to improve my ability to hear.
> Thanks for any advice...
> Paul
> W1PEF
>
>
> __
> Elecraft mailing list
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> Message delivered to rmcg...@blomand.net
>

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Re: [Elecraft] RX antenna protection

[Bob McGraw K4TAX]

See page 63 of the manual.  Also page 70 under Receive."*HI RFI* 
warning:"


RFI DET - *NOR *enables detection of high RFI at the antenna in receive 
mode.  (see HI RFI warning. *Troubleshooting*). Set to OFF to disable 
the warning.


73
Bob, K4TAX
K3S s/n 10163


On 8/15/2017 9:50 AM, j...@kk9a.com wrote:

Great question! I asked the same thing once and never got an answer so to
be safe I either short the RX antenna during transmit or if SO2R I use DXE
receiver guards. It would be nice if the K3S had a similar built in
protector.

John KK9A

W1PEF wrote
Mon Aug 14 21:48:29 EDT 2017

I am considering a Rx antenna but my property is small and concerned about
strong signals over powering the receiver. Does the K3S have built-in
protection?
Does anyone use a loop receive antenna or BOG antenna ... would like some
recommendations from actual users of receive antennas.
Have the complete K-Line and would like to improve my ability to hear.
Thanks for any advice...
Paul
W1PEF


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[Elecraft] KXPA100 Feature request

[Gerald Eberle]

Hello All

My activ setup here consists of a KX3/KXPA100 with ATU and 2 antennas.
Antenna 1 is a dipole fed with balun into twinlead and matched with the ATU, 
mainly used for the 6 - 30m band.
Antenna 2 is a vertical (H-loop) with an SGC-Tuner at the base of the vertical, 
used mainly for 40 and 80m.

The KXPA100 saves the last used antenna per band, but NOT the mode. The mode 
has to be changed by hand which is not very convinient for fast band switching, 
eg. in a contest. What I would like to have is that the antenna AND the 
ATU-Mode is saved per band.

Will this be possible to implement in the firmware? Or have I something 
overseen in the manual?

Thanks and 73, Gerald - HB9CEY
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Re: [Elecraft] RX antenna protection

[Ignacy]

If a receive antenna has a preamp, there no need to do any antenna guard
since the preamp cannot destroy K3. 

I used K9AY, K7TJR 3 el array, and a Wellbrook loop close to transmit
antennas. None was turned off during transmit.  Both have preamps and
nothing was damaged despite running a  KW. Of all 3, K7TJR was the best by
far. 

BTW, the RX ANT input in K3 is protected by a RF activated relay.  

Ignacy, NO9E



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Re: [Elecraft] RX antenna protection

[Don Wilhelm]

John,

The K3S does have protection on the RX ANT input.  It is in the form of 
a COR (carrier operated relay) that will close in the presence of a high 
RF Field.
While that protects the K3S, the relay clacking can be bothersome, so if 
you do hear that relay clacking, you may want to consider some form of 
external protection.


73,
Don W3FPR

On 8/15/2017 10:50 AM, j...@kk9a.com wrote:

Great question! I asked the same thing once and never got an answer so to
be safe I either short the RX antenna during transmit or if SO2R I use DXE
receiver guards. It would be nice if the K3S had a similar built in
protector.

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Re: [Elecraft] RX antenna protection

[j...@kk9a.com]

Great question! I asked the same thing once and never got an answer so to
be safe I either short the RX antenna during transmit or if SO2R I use DXE
receiver guards. It would be nice if the K3S had a similar built in
protector.

John KK9A

W1PEF wrote
Mon Aug 14 21:48:29 EDT 2017

I am considering a Rx antenna but my property is small and concerned about
strong signals over powering the receiver. Does the K3S have built-in
protection?
Does anyone use a loop receive antenna or BOG antenna ... would like some
recommendations from actual users of receive antennas.
Have the complete K-Line and would like to improve my ability to hear.
Thanks for any advice...
Paul
W1PEF


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Re: [Elecraft] [K3S] K3S High SWR Shutdown on FT8?

[MaverickNH]

That alarm turned out to be my USP - the sound was hard to track down as it's
on the floor. The USP is a CyberPower CP1500PFCLCD which is giving an
Overload alarm on typically the last TX of a QSO at 100W. The specs are
Output 1500VA 900W.

I'm curious why power consumption increases with each 15sec FT8 TX, when I
have a SWR 1:1 with a SG-235 antenna coupler at the base of my 43ft
Vertical. PA Temperature runs about 40-42C when the overload alarm goes off.

Bret/N4SRN



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Re: [Elecraft] RX antenna protection

[Mark E. Musick]

Paul,
I use several different receive antennas and use all the ones I am going to
suggest.
For your small lot, you didn't say how small, I would look at the Pixel
loop, K9AY and RBOG.
I have used these and they work. You can get all three from DX Engineering.
>From ARRAY Solutions there is the Shared Apex Loop. It will take up about
the same space as a K9AY. I have not used one of these so can't say
personally how well it works, but people I know that have used them speak
highly of this antenna.
You have gotten two good suggestions for front end protection. I use the DX
Engineering receiver guard model RG-5000. You don't need the RG-5000HD
unless you're in a contest environment. 
Keep us posted on your progress.

73,
Mark, WB9CIF

-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chuck Milam, N9KY
Sent: Tuesday, August 15, 2017 1:16 PM
To: Elecraft Mail List 
Subject: Re: [Elecraft] RX antenna protection

Also, check out the DX Engineering Receiver Guard Electronic RF Limiters:


https://www.dxengineering.com/search/part-type/hf-receive-antenna-system-dev
ices/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autov
iew=SKU=Default=Ascending

---
Chuck Milam, N9KY
n...@arrl.net

On Mon, Aug 14, 2017 at 11:07 PM, Drew AF2Z  wrote:

> Same situation here: small space and would like to try some low noise 
> receive antennas. I recently bought an Array Solutions AS-RXFEP rf 
> limiter to use on the RX Ant port of my K3. Haven't tried it yet but 
> looks like it will do the job.
>
>
> 73,
> Drew
> AF2Z
>
>
>
>
> On 08/14/17 21:48, W1PEF wrote:
>
>> I am considering a Rx antenna but my property is small and concerned 
>> about strong signals over powering the receiver. Does the K3S have 
>> built-in protection?
>> Does anyone use a loop receive antenna or BOG antenna ... would like 
>> some recommendations from actual users of receive antennas.
>> Have the complete K-Line and would like to improve my ability to hear.
>> Thanks for any advice...
>> Paul
>> W1PEF
>>
>>
>>
>>
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> n...@arrl.net
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Re: [Elecraft] Help needed atTrade show

[KD6QZX]

Howdy it's Scott bastianPlz add me to the roster for the Torrance show!   

> On Aug 14, 2017, at 15:44, Madelyn Gomez [via Elecraft] 
>  wrote:
> 
> Hello Elecraft supporters. 
> 
> We are doing the Huntsville Hamfest this weekend (Aug 18, 19 and 20) in 
> Huntsville, Alabama.  We find ourselves in need of a few good volunteers. 
> 
>  We could use help setting up on Friday.  We could also use some technical 
> support in the booth on Saturday and Sunday, any time that you have 
> available. 
> 
> If you would like to volunteer please email me directly ( 
> [hidden email]) for the particulars. 
> 
> Thank you, 
> 
> Madelyn Gomez 
> Elecraft Sales 
> 125 Westridge Drive, Watsonville, CA. 
> 831-763-4211 
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> 
> 
> If you reply to this email, your message will be added to the discussion 
> below:
> http://elecraft.365791.n2.nabble.com/Help-needed-at-Huntsville-Trade-show-tp7633400.html
> To unsubscribe from Elecraft, click here.
> NAML




-
K3 #348 KX3 #2499
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Re: [Elecraft] RX antenna protection

[Chuck Milam, N9KY]

Also, check out the DX Engineering Receiver Guard Electronic RF Limiters:


https://www.dxengineering.com/search/part-type/hf-receive-antenna-system-devices/product-line/dx-engineering-receiver-guard-electronic-rf-limiters?autoview=SKU=Default=Ascending

---
Chuck Milam, N9KY
n...@arrl.net

On Mon, Aug 14, 2017 at 11:07 PM, Drew AF2Z  wrote:

> Same situation here: small space and would like to try some low noise
> receive antennas. I recently bought an Array Solutions AS-RXFEP rf limiter
> to use on the RX Ant port of my K3. Haven't tried it yet but looks like it
> will do the job.
>
>
> 73,
> Drew
> AF2Z
>
>
>
>
> On 08/14/17 21:48, W1PEF wrote:
>
>> I am considering a Rx antenna but my property is small and concerned
>> about strong signals over powering the receiver. Does the K3S have built-in
>> protection?
>> Does anyone use a loop receive antenna or BOG antenna ... would like some
>> recommendations from actual users of receive antennas.
>> Have the complete K-Line and would like to improve my ability to hear.
>> Thanks for any advice...
>> Paul
>> W1PEF
>>
>>
>>
>>
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