Date   

No transmit power after using TEST

Pat Brannick N2BZD
 

I was using the TEST TX function to set up a paddle on CW, then when done I Hit TEST and TX stopped flashing so I should be able to transmit, however, there is no out put power.
 
Here are the config settings:
 
1.  Not in TEST'
2.  TX INH is OFF
3.   KXV3 is nor

I tried turning the rig on/off but no luck.  The AutoTune function does work tuning to SWR 1:! at 5 W, 

I set the Power know to 97 W, the TX is on steady but no output power.
 
How do I get Transmit power back?
 


Re: [Elecraft] KPA1500 vs SPE Amps

Stephen Bloom
 

A more valid comparison, in terms of both price point and performance would be the 2K-FA to the KPA1500.  As in the case of the 1.5K it is a single LDMOS device, though that LDMOS is more robust.  I have 2 2K-FAs and 1 1.5K-FA (had a 1.3K-FA which I sold).  All were bought either before the KPA1500 started shipping, or while the waiting list was months long.  The 2K-FA will comfortably run 1500W without getting super hot in non full duty cycle modes, but only 1200W in full duty cycle (such as RTTY).  The issue with single LDMOS vs. dual isn’t necessarily power output per se, but about IMD products.  Heavy duty operation at full power of a single LDMOS is pushing the envelope, but given the fact that the LDMOS in the 2K-FA is rated at 2KW or so, it seems acceptable. 

 

I’ve only used the 1.5K-FA a limited amount and also have found no issues getting 1.5KW out ..as a matter of fact, the firmware doesn’t seem to enforce the 1200W limit on RTTY, though I don’t recommend doing it.  The lower rated LDMOS and the smaller unit would have me hesitant to run it at full limit for 48 hours, but I have no reason other than general conservativeness in terms of amplifiers, even tube types.  I’m surprised you had trouble driving it to full power, but I basically concur that you should consider it as a 1000-1200W amp.  Also a reminder that the difference between 1000-1200 and 1500 is *very* marginal.

 

My intent for the 1.5K is to use it as a travel amp with a KX3, a lightweight kilowatt, though for now it has a position at the contest station.  When finances allow, I will probably buy a KPA1500 for that position.

 

As for having both KPA500 and 1500 in line, there is just no reason.  You don’t have to drive the KPA1500 to full limit.  At 500W, the fan won’t run much, so noise won’t be an issue.

 

73

Steve KL7SB

 

 

From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Drew Vonada-Smith K3PA
Sent: Tuesday, February 12, 2019 4:25 PM
To: Elecraft-K3@groups.io
Subject: Re: [Elecraft-K3] [Elecraft] KPA1500 vs SPE Amps

 

That SPE report sounds typical.  I believe the device only uses one LDMOS device, while the KPA1500 has two.  Though I gripe about the very loud fans on the KPA1500, it is otherwise a  good amplifier, at full legal limit contest service.  It is my 2nd amp, with the ACOM 2000 as primary.

73,

Drew K3PA


Re: K3/0 mic path question

Paul K9NU
 

Bias is supplied by the RemoteRig box. Set the K3 to rP.l, no bias. Make sure that you don't have another mic plugged into the front panel of the K3/0.

73,
Paul K9NU


Re: K3/0 mic path question

Paul K9NU
 

No bias from the K3 and set to (rP.L) Bias is supplied RemoteRig box. Make sure you don't have another mic plugged into the front panel of the K3/0.

73,
Paul K9NU


Re: K3/0 mic path question

Don Solberg
 

Dennis,

I don't have first hand knowledge of the K3/0 but I do have a K3 that I operate remotely.  It was my understanding that you needed an external method to connect your audio.  I thought the mike audio had to be run thru either a PC or a RemoteRig.  How are you connecting your K3/0 to your K3?

Don, K9AQ


Re: [Elecraft] KPA1500 vs SPE Amps

Drew Vonada-Smith K3PA
 

That SPE report sounds typical.  I believe the device only uses one LDMOS device, while the KPA1500 has two.  Though I gripe about the very loud fans on the KPA1500, it is otherwise a  good amplifier, at full legal limit contest service.  It is my 2nd amp, with the ACOM 2000 as primary.

73,

Drew K3PA


Re: [Elecraft] KPA1500 vs SPE Amps

Paul Baldock <paul@...>
 

I owned an SPE 1.5K for 2 weeks, before sending it back.

It struggled to make 1500W. On 20M compression was 2dB, compared to about 1dB on the KPA1500. On 6M it maxed out at around 1.3KW. SPE recommend not running compression on phone. I can see why as after about 15 mins of operation it would cut back to"mid" power. I think if you considered it a 1KW amp and run it at that level then you would be happy. SPE amps do not meet the FCC specs for gain of < 15dB. Mine was around 21dB. A lot of their customers like this, but I specifically want mine at around 14-15dB so I could drive it with similar power to my ACOM2000. I did like the 2 rf inputs.

- Paul KW7Y

At 01:44 PM 2/12/2019, you wrote:
Has anyone had experience with both the KPA1500 and any of the current (1.3K, 1.5K or 2K) Expert Linears from SPE? I was initially leaning towards the 1.3K-FA without the ATU. The more I thought about it, the more I wanted to go with an ATU. The price difference to get less than 1db in going from 1300 watts to 1500 was also a bit of a concern. However, I’ve never pushed my 3x8874s to more than 1200 and only on the low bands. I have a KPA500 with the KAT500 and it’s great. However, in a 160 pileup a bit more power would help. Changing bands quickly is awesome. That has me leaning towards the KPA1500. If anyone would like to share their thoughts, it would be greatly appreciated. Also, I’m wondering if anyone has run their KPA500 and a KPA1500 off of the same K3? If so, how did you set it up? Tnx es 73, Dave N8AG Sent from Mail for Windows 10 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to paul@paulbaldock.com


Re: K3/0 mic path question

Mark Morin
 

Yes Mitch,

I have experimented with it, but decided to leave the RemoteRig boxes in normal mode. Continuous RTP packets in both directions considerable increases the required bandwidth for VoIP and the amount of data used each month (mine is limited). Vox for CW purposes still works in the normal mode, just not for voice.

I hate voice VOX anyway, so no big loss in my case. Wouldn’t want anyone to hear what I say when I spill my coffee.

73 Mark VA2MM


Re: K3/0 mic path question

Mitch Wolfson
 

Assuming you guys are speaking about RemoteRig.....actually, it is very easy to implement VOX.
All you need to do is to change RTP TX Mode in both RRC's to "continuous" . This is set to off by
default and no one uses VOX for that reason.

73,
Mitch DJ0QN / K7DX


Re: K3/0 mic path question

Mark Morin
 
Edited

Dennis,

I use the CM500 with the K3-0 mini. You mention VOX parameters, so I’m wondering if you are trying to use voice VOX over a remote connection. Depending on your set-up, this can be tricky because you need it to be set up for full duplex VoIP audio all the time (even on receive) so that the transmit audio can be sent to the VOX circuits in the K3 even when you’re in receive mode. This might not be related to your mic problem (which sounds like a bias issue) but if you are using voice VOX, you might want to try it with a hardware PTT on the front panel mic connector or the rear PPT jack. I use a foot-switch for this.

Also, to be double-sure that you have bias, I suggest putting a DC voltmeter across the side mic connector to make sure you see about 8V DC. I seem to remember that a jumper needs to be set to enable mic bias on the control end. Another easy way to fix the bias (if that's the issue): My CM500 came with a handy little battery dongle that can provide the bias for the mic, even when the port it connects to does not supply bias. Might be another troubleshooting thing to try.

I’m away at the moment so I can’t check physical how mine is set up until Friday.

Good luck.

Mark VA2MM


Re: strange tone using FT8 on 80M

Rick NK7I
 

Dropping the power levels and finding changes tells you that RF is getting into the audio chain.  To verify, run full power into a rated dummy load and the issues should still be gone.

If you're using an external (computer or widget) sound card, the cabling is picking up the RF, so using quality cables and perhaps some ferrite clamp ons, would be a reasonable place to start.

Making sure that bonding between the pieces of the station is proper is stage two (or if using a K3S with internal sound).

If you're using a USB sound card (most do) that opens up a Pandora's box of issues, most are easily managed with the above.

Rick nhc

On 2/12/2019 9:54 AM, todd ruby wrote:
Hi all,
I have been playing around with FT8 on my K3, and it has been working fine on all the bands where I have transmitted, 17,20 and 40M. However, on 80M, instead of the pure tone as on the other bands I am getting the tone but also a hum/buzz unless I dial the power down to 20W. On all the other bands I hear the pure transmit tone regardless of the power setting from 50-700W with no problems.

Any ideas what is up with  80?

tnx es 73

todd 
WB2ZAB
SN#339


strange tone using FT8 on 80M

todd ruby
 

Hi all,
I have been playing around with FT8 on my K3, and it has been working fine on all the bands where I have transmitted, 17,20 and 40M. However, on 80M, instead of the pure tone as on the other bands I am getting the tone but also a hum/buzz unless I dial the power down to 20W. On all the other bands I hear the pure transmit tone regardless of the power setting from 50-700W with no problems.

Any ideas what is up with  80?

tnx es 73

todd 
WB2ZAB
SN#339


Re: K3/0 mic path question

Dennis Ashworth
 

Yes, the bias is on.
Thanks

On Feb 11, 2019, at 8:07 PM, Gary K9GS <garyk9gs@...> wrote:

Did you turn on the bias?



73,

Gary K9GS

-------- Original message --------
From: Dennis Ashworth <dennisashworth49@...>
Date: 2/11/19 9:17 PM (GMT-06:00)
Subject: [Elecraft-K3] K3/0 mic path question

I’m attempting to interface a CM500 headset to my K3/0 mini. The phones audio is no issue, but I can’t seem to get mic drive to the side panel mic jack. I’ve tried the various config options, Vox gain at 100, anti vox at 0, but no joy? Ideas?

Dennis, K7FL



Re: K3/0 mic path question

Gary K9GS
 

Did you turn on the bias?



73,

Gary K9GS

-------- Original message --------
From: Dennis Ashworth <dennisashworth49@...>
Date: 2/11/19 9:17 PM (GMT-06:00)
To: Elecraft-K3@groups.io
Subject: [Elecraft-K3] K3/0 mic path question

I’m attempting to interface a CM500 headset to my K3/0 mini. The phones audio is no issue, but I can’t seem to get mic drive to the side panel mic jack. I’ve tried the various config options, Vox gain at 100, anti vox at 0, but no joy? Ideas?

Dennis, K7FL



K3/0 mic path question

Dennis Ashworth
 

I’m attempting to interface a CM500 headset to my K3/0 mini. The phones audio is no issue, but I can’t seem to get mic drive to the side panel mic jack. I’ve tried the various config options, Vox gain at 100, anti vox at 0, but no joy? Ideas?

Dennis, K7FL


RX ANT input reception issue

Petr Ourednik
 

Hi all,

I would like to ask kindly for ideas, tips or opinion please.

Simply I have problem with RX ANT input reception. I lost reception from external Beverages
on that input during last contest event > it worked well most of the time but Sunday evening
I realized that noise from Beverages is going down, some time later I realized that even sigs
lower and lower and finally after some time (15-20min) I realized that I am deaf from RX ANT input.
When I switched to receive back from ANT1 main all looked ok with receiver sensitivity etc.
It happened not instantly but gradually!

When I disconnected BNC from KXV3 board on read panel of K3 and put it back it received instantly OK.
So my first though was > well I have bad contact on the coaxial cable/BNC. Unfortunately
when I switched RX ANT input OFF then ON I lost sigs immediately again.
I tried to shaking with BNC on rear panel and randomly I got it back to work but
when switched on front panel the RX ANT again I lost reception from external Beverages again.

So something is wrong in my K3 and have no idea what to do at this moment BUT...
... it can be also linked to the "Phenomenon" from the Sunday earlier morning.
I noticed in the morning that during transmitting I had strong audio feedback into QSK which
sounded to me at first like short echo from myself > propagation Phenomenon.
I made short vid here: https://youtu.be/cV3rzlsZbA4

When I talked to other people they routed my mind to idea that it can be linked to RX ANT issue then after in the evening...

I am using always Front-end antenna Saver circuit which is grounding receiver input on RX ANT
port when TXing by fast relays (0.5ms) and I used only K3 at 100W out without any power amplifier!
So I do not believe/hope that I damaged it by TXing to Inverted V antenna by induced energy back thru Beverages...
See the FES circuit used here:
http://ok1rp.blogspot.com/2015/03/front-end-saver-for-lb-antennas.html

I will be happy to get some idea, advise or hint what I should check and replace or how I could solve it.

73 - Petr, OK1RP


Re: No power out on data A mode after firmware upgrade

Bob Brodovsky K6UDA
 

Thank you. The line gain was reset to 1. I'm back up now. Thanks a bunch. -K6UDA


Re: No power out on data A mode after firmware upgrade

Bob Brodovsky K6UDA
 

Yes it is. in the data A position.


Re: K3S Loose Microphone Connector

Michael Foerster
 

Thanks guys, guess it's normal...

I thought about trying to solder the shell to the wire on the back side, but I doubt that the solder would stick. 
   I'll just leave it alone. 

Mike, W0IH


Re: K3S Loose Microphone Connector

Dave (NK7Z)
 

After removing the little metal cap, I checked, mine is the same way, the pins are hard bound, the ring is loose.

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
Award Manager, 30MDG Grid Awards
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 2/5/19 4:09 PM, Richard Williams via Groups.Io wrote:
Ed,
The 8 pins within the connector are tight; the part with some "play" is just the ring with the threads on it.
Dick, K8ZTT
On Tuesday, February 5, 2019, 3:16:03 PM MST, Ed Pflueger <ab4iq@comcast.net> wrote:
I have 10853 and 10858 for K3S’s and 2971 for a K3 and all of mine are tight.  I bought the deluxe models.  Hi..
Ed.. AB4IQ
*From:*Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] *On Behalf Of *Steven Wolf KC8BW
*Sent:* Tuesday, February 5, 2019 3:40 PM
*To:* Elecraft-K3@groups.io
*Subject:* Re: [Elecraft-K3] K3S Loose Microphone Connector
Mine is also loose.  I haven't opened it up, but I figured that the connector was just soldered to the board and not fastened to the front panel.  It seems that most electronic items are constructed that  way these days.  In other words, "they don't make 'em like they used to"
73,
Steve  KC8BW

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