Re: [Elecraft] [K2] Spurious emission in SSB

Chris Is the frequency separation exactly 900 kHz? If a bit more, perhaps the oscillator in the KSB2 MCU (U1/Z1) at (nominally) 4 MHz is coupling into the IF (nominally 4.915 MHz) path on the same board, on the output side of the crystal filter). Problems with grounding, bypass capacitors

[Elecraft] Any problems with this 6m setup with KPA500?

A few of us are planning an multi-operator operation for next weekend's CQ WW VHF contest, cobbling together equipment from different places. I am wondering if there are any potential issues (most likely with switching timing) with the following potential setup for six metres: Radio: K2

[Elecraft] [K2] Erratic tuning solved, I think

I took the front panel and control boards off the RF board and reassembled themthe intermittent lack of response to tuning knob returned after a couple of minutes. So I tried Don's first couple of steps (reflowing solder on encoder lead and front panel board U3) and that seems to have done

Re: [Elecraft] Erratic tuning on K2

panel U3 as well as P1, RF Board J7 and Control Board P2.  Also reflow Control Board U6 pins 8 and 16. 73, Don W3FPR On 6/10/2019 9:09 AM, Steve Kavanagh via Elecraft wrote: > One of my K2's has developed a problem where it is (somewhat intermittently) > unresponsive to turning the tunin

[Elecraft] Erratic tuning on K2

One of my K2's has developed a problem where it is (somewhat intermittently) unresponsive to turning the tuning knob. Turning the knob may or may not, at different times, cause the radio to change frequency. Pushing on the case/panels and tapping the tuning knob sometimes seem to help, so I

[Elecraft] K4? Or K2S?

If Elecraft had a rig that was an update to the K2 (same size box with no jacks on the sides, and all in one box unlike the KX3+KXPA100) with the following features, I'd be interested. I find the form factor of the K2 ideal for a rig that wears many different hats in the shack and portable.

[Elecraft] [K2] External Fan Hum

I was experimenting with an external 120V AC fan to improve the cooling of the KPA100 during CW Sweepstakes this past weekend. The cooling worked fine but the fan caused some hum on received signals (and presumably my transmitted signal as well). Placing the fan towards the right and back

Re: [Elecraft] [VHFcontesting] Alternate FT8 frequencies on 50 MHz during contests ?

traction. I routinely now see FT8 signals on 50.313, 50.323 and even 50.333 at times when the band is open over the Atlantic. Mike va3mw On Sat, Jul 7, 2018 at 6:43 AM, Steve Kavanagh via Elecraft wrote: Mark As you may know, WB5JJJ suggested using a separate frequency on 6m for contest mode

Re: [Elecraft] [VHFcontesting] Alternate FT8 frequencies on 50 MHz during contests ?

Mark As you may know, WB5JJJ suggested using a separate frequency on 6m for contest mode FT8, and leaving 50.313 for those running normal FT8 format. I tend to think this might work out fairly well, but it didn't gain much traction on the WSJT group where he posted the suggestion. But this

Re: [Elecraft] Laptop Power Supplies

My old HP supply is marked 18.5V 3.5A. My wife's newer HP is 19.5V 2.31 A. The two DC plugs are very different (not sure how to specify them). that could be an interesting product. Mind you, experiments have shown that my laptop creates a bit of RFI from every port (USBs, audio etc.) and

Re: [Elecraft] [K2] Using the K2 above 29 MHz

I made some measurements on my K2/K60XV. It seems the bandpass filter does cut off just above 28.8 MHz and the available 1 mW output from the K60XV drops markedly starting around 29 MHz. It would not be practical to use this output unless the bandpass filter were retuned. At the QRP antenna

Re: [Elecraft] [K2] Using the K2 above 29 MHz

. Thanks for your info. 73, Steve VE3SMA On Sat, 5/19/18, Dave Sublette <k4to.d...@gmail.com> wrote: Subject: Re: [Elecraft] [K2] Using the K2 above 29 MHz To: "Steve Kavanagh" <skavanag...@yahoo.ca> Received: Saturday, May 19,

Re: [Elecraft] [K2] Using the K2 above 29 MHz

ecraft] [K2] Using the K2 above 29 MHz To: "Steve Kavanagh" <skavanag...@yahoo.ca> Cc: "Elecraft Discussion List" <elecraft@mailman.qth.net> Received: Saturday, May 19, 2018, 2:12 PM I have used my K2 with a DEMI 2M transverter board in it to drive transverter

[Elecraft] [K2] Using the K2 above 29 MHz

The K2 is specified to operate on 10m only up to 28.8 MHz. While contemplating possible future VHF rigs for a multi-operator multi-band environment, I have wondered about using a K2 as an IF for VHF transverters at around 29-29.4 MHz (to avoid interference with bands using 28 MHz IF). Both of

Re: [Elecraft] Modifying the K2 for use as an IF radio for the microwave bands

There's been several good points made about my K2 internal 2m transverter project...here's a bit of my thinking about why I went the way I did: (1) Using an alternate transverter (VE3SYB) - I did consider the Transverters Unlimited board from the Ukraine to potentially give me more output, but

[Elecraft] Modifying the K2 for use as an IF radio for the microwave bands

For a while now I've been working on a project to install a low power 2 metre transverter inside an Elecraft K2, in order to use it as an IF transceiver with transverters for the microwave bands. I got it done this summer and used it on 10 GHz during the ARRL 10 GHz and Up Contest, as a

Re: [Elecraft] K3: 2 meter SSB/CW Capability Questions

Phil One possible way to make a decision is to consider whether or not you might want to try meteor scatter on 2m using MSK144. The recommended absolute frequency accuracy for that mode is 25 Hz (though I think you'd get away with 80 Hz). This is a real challenge at 2m and the XV144 isn't

[Elecraft] [K2] Frequency Calibration using WWV Audio Tones

I was wondering if anyone had tried doing the reference oscillator frequency calibration for a K2 without the rather troublesome step of accurate zero-beating by feeding the 500/600 Hz audio tones from WWV/WWVH to a computer sound card or smart phone spectrum analyzer, or similar program? It's

Re: [Elecraft] MH4 Microphone Questions

Thanks, Wayne. Very tempting! 73, Steve VE3SMA On Sun, 9/3/17, Wayne Burdick wrote: > Can anyone confirm that the dimensions match?  They do. It’s the same size as our MH3, used with the KX2 and KX3. > Has anyone tried

[Elecraft] MH4 Microphone Questions

I find the MH2 a bit on the large side for my hands, so the MH4 looks interesting to me. The case appears to be identical to the Icom HM-36,which I use with one of my K2s and find very comfortable to hold. Can anyone confirm that the dimensions match? Has anyone tried out the MH4 for

Re: [Elecraft] [K2] Sensitivity Spec

On Tue, 8/15/17, Don Wilhelm <donw...@embarqmail.com> wrote: Subject: Re: [Elecraft] [K2] Sensitivity Spec To: "Steve Kavanagh" <skavanag...@yahoo.ca>, elecraft@mailman.qth.net Received: Tuesday, August 15, 2017, 8:29 PM Steve, Typically, the receiver i

[Elecraft] [K2] Sensitivity Spec

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

[Elecraft] [K2] Odd "Hi Refl"/high current problem only in TUNE

This one cropped up just today, with no significant change in my home station setup, using a K2/100 on 40m using a low inverted Vee. Sometimes (typically every other or every third time, but randomly), when pushing (and holding) the tune button with the power set to 11 watts or more, I get a

Re: [Elecraft] [K2] External amplifier keying circuit question

Initial testing using the two-MOSFET circuit (http://www.mmccs.com/mmarc/n0ss/k2_t-r_rly_drvr.pdf ) with two 2N7000s, but with R3 removed, indicates that it is working fine, switching a load of about 50 mA at 12-13V. I left R2 in. Thanks all for your comments. 73, Steve VE3SMA

Re: [Elecraft] [K2] External amplifier keying circuit question

Thanks, Don.  Good point re the input side...I guess I'm not used to having plug-in boards in mind! Yes, I was thinking of a pair of 2N7000s - they are fine for the current and voltage I need to switch. 73, Steve VE3SMA __

[Elecraft] [K2] External amplifier keying circuit question

I'm planning to add an external amplifier/transverter keying circuit to one of my K2s.  I found two versions on the web, both apparently designed by N0SS (SK).  The one on the Elecraft site (http://www.elecraft.com/Apps/Amp_keying_ckt.htm ) appears to be his original circuit, using a 2N7000

[Elecraft] Modified KAF2 Build

Here's something that may be of interest to solder-minded K2 owners pondering filtering options.  I've built and installed a KAF2  kit with several component changes to make it a little wider in bandwidth, so as to be more useful in general CW operating, scanning the bands and contests rather

Re: [Elecraft] Modified KAF2 Build

Once again Yahoo and mailman between them have conspired to mess up my link!  Let's see if I can make it come out right this time: http://www.qsl.net/ve3sma/ModifiedKAF2.pdf 73,Steve VE3SMA __ Elecraft mailing list Home:

[Elecraft] [K2] Photo of Workaround for Failed K2 Headphone Jack

The usual K2 headphone jack failure results in the speaker going dead.  To fix it requires replacing the jack, but a workaround is to short two pads together.  The speaker will then run all the time, whether or not there are headphones plugged into the front of the rig.  The speaker can be cut

Re: [Elecraft] [K2] Photo of Workaround for Failed K2 Headphone Jack

Hmmmmailman and Yahoo between them have managed to mangle the links...they should be http://www.qsl.net/ve3sma/downloads2.html  , while the photo itself is at http://www.qsl.net/ve3sma/K2HeadphoneJackSwitchBypass.jpg  .   Hope that works better. Steve VE3SMA  

Re: [Elecraft] K2 headphone jack pinout ?

Thanks, Don. Shorting those two pads together with a screwdriver brought the speaker back to life, confirming the standard failure.  Now I can decide what to do about it! 73,Steve VE3SMA   From: Don Wilhelm d...@w3fpr.com To: Steve Kavanagh skavanag...@yahoo.ca; elecraft@mailman.qth.net

Re: [Elecraft] K2 headphone jack pinout ?

...@embarqmail.com To: Steve Kavanagh skavanag...@yahoo.ca; elecraft@mailman.qth.net elecraft@mailman.qth.net Sent: Friday, June 26, 2015 7:57 PM Subject: Re: [Elecraft] K2 headphone jack pinout ? Steve, An examination of the headphone jack connections in the K3 schematic should answer your question

[Elecraft] K2 headphone jack pinout ?

I think one of my K2s has suffered the dreaded headphone jack failure (no speaker or speaker jack output - headphones work fine).  To confirm this diagnosis (and perhaps to make mods to prevent it happening again) I'd like to get my hands on the pinout of the headphone jack J2.  I was surprised

Re: [Elecraft] Audio Levels for WSJT on K2, etc.?

To: Steve Kavanagh skavanag...@yahoo.ca; Elecraft@mailman.qth.net Elecraft@mailman.qth.net Sent: Tuesday, March 17, 2015 5:42 PM Subject: Re: [Elecraft] Audio Levels for WSJT on K2, etc.? Steve, On the K2 with any data mode, run the audio up until you see one ALC bar, and then back it down until

[Elecraft] Audio Levels for WSJT on K2, etc.?

I'm starting to play a bit with JT65 on HF (using WSJT-X) with my K2 and homebrew interface hardware.  The frequency response of the K2 seems reasonably flat, but occasionally I see power dropouts when the tones change.  This is despite always hitting the requested power at any audio frequency

[Elecraft] Audio Levels for WSJT on K2, etc.?

I forgot to mention that I am using RTTY(reverse) mode with SSBA = 2 and SSBCr = 1-1.  Do those settings make sense? Steve VE3SMA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

[Elecraft] [K2] Installing old KPA100 in a 2nd K2?

I have recently acquired a used K2, my 2nd (S/N 5133).  I am just wondering what it would take to install the KPA100 from my older (S/N 4509) K2 in the newer one and keep it usable with the old one too.   I have been perusing the KPA100 manual (current version) and it appears to me that all I

Re: [Elecraft] [K2] Installing old KPA100 in a 2nd K2?

Thanks, Don.  Sounds pretty straightforward.  I'll make a point of adding that to my K2 to-do list! 73,Steve VE3SMA From: Don Wilhelm w3...@embarqmail.com To: Steve Kavanagh skavanag...@yahoo.ca; Elecraft@mailman.qth.net Elecraft@mailman.qth.net Sent: Wednesday, February 25, 2015 7:09

Re: [Elecraft] [K2] Low TX Output on Higher Bands

In the remote chance that someone else is tracking down a similar problem, I eventually tracked this issue down to a bad solder joint at R94 (in the transmit buffer circuitry).  Thanks to Don, W3FPR, for his (now legendary) assistance! 73,Steve VE3SMA   From: Steve Kavanagh skavanag

Re: [Elecraft] [K2] 8T signal at J13

it would probably be ok to leave it unconnected, but I'm just reviewing my options. 73,Steve VE3SMA From: Don Wilhelm w3...@embarqmail.com To: Steve Kavanagh skavanag...@yahoo.ca; Elecraft@mailman.qth.net Elecraft@mailman.qth.net Sent: Tuesday, February 10, 2015 6:30 PM Subject: Re

[Elecraft] [K2] 8T signal at J13

I was given a DEMI TIK2 transverter interface board which I would like to install in a K2.  It requires the 8T signal on pin 6 of J13 on the RF board, which was there on early K2s but not on more recent versions.  Can I just connect together the pads marked X and 8T (on page 9 of the K60XV

Re: [Elecraft] [K2] Low TX Output on Higher Bands

Well, I've been doing lots of measurements and inspections and I'm still not sure what is the matter. As suggested I rechecked the DC voltages on Q6 and got 1.03 V on the base and 0.25 V on the emitter. The difference is 0.79 V - high, but plausible. The emitter resistor R50 measures 1.4

Re: [Elecraft] [K2] Low TX Output on Higher Bands

of Q6 might be a bit weak...but it doesn't quite feel like what would drop the power by 10 dB. The bias is about right...around 1.05V. Thanks 73, Steve VE3SMA - Original Message - From: Don Wilhelm w3...@embarqmail.com To: Steve Kavanagh skavanag...@yahoo.ca; Elecraft@mailman.qth.net

[Elecraft] [K2] Low TX Output on Higher Bands

As I proceed with checking the new-to-me (S/N 5133, bare-bones, no options) K2 out, I'm finding that the maximum transmit power output drops markedly as the frequency goes up. If I set the power to maximum, I can get the following approximate powers (on CW): 80m: 15 W 40m: 15 W 30m: 15 W

[Elecraft] [K2] C22 has no effect

I just acquired a second hand K2 (my second one) and upon going thru the operation in detail I noticed that it was somewhat off frequency. WWV at 10 MHz is received best (on USB using the CW filter - there is no SSB board) at 10,000.96 MHz and adjusting C22 has no discernible effect on the

Re: [Elecraft] [K2] C22 has no effect

Thanks for setting me straight, Don and Mike. I think have the hang of it now...calibration is much better now - though I still may want to refine it a bit. Though, I didn't seem to be able to make the N6KR method work on WWV at 20 MHz - couldn't get a frequency match. But it's ok at 15 MHz.

[Elecraft] [K2] K60XV Low Output at Low Voltage

I noticed this past weekend that my K2's transverter output level was lower than the nominal 1 mW it was set to when operating from the car battery with the ignition off.  I confirmed this behaviour today, with about a 12.2 V power supply voltage to the K2.  The power control of the K60XV

Re: [Elecraft] [K2] K60XV Low Output at Low Voltage

with that lower level. The reason for changing the TRN menus is to keep from overdriving the transverters when operating from a higher voltage power source. 73, Don W3FPR On 6/18/2014 10:03 AM, Steve Kavanagh wrote: I noticed this past weekend that my K2's transverter output level was lower than

Re: [Elecraft] K2 Push To Talk

Lloyd   One option for the K2/transverter hot switching problem on CW is to build a  sequencer which breaks the TX IF line, like this one:   http://www.qsl.net/ve3sma/3OutputSequencerForK2.pdf   This only works, however, if you are running very low IF power from the K60XV (or at least run the 10W

[Elecraft] Spectrogram

While it's convenient to have all the settings specified by N0SS (SK), keep in mind that there are a variety of other audio spectrum analyzer programs available which are suitable for K2 CAL FIL alignment.  For example, I used Spectran (written by I2PHD) under Windows 7 the other day to

[Elecraft] KAF2 filter mod experience ?

I just received a KAF2 audio filter kit for my K2 and I am considering a few mods when I build it, to increase the bandwidth somewhat, and to increase the gain.  My use of the K2 is mostly for VHF weak signal work with transverters, often outdoors with lots of background noise (surf, crickets

Re: [Elecraft] Chirp with K2/XV222 - Transverter Issues

Thanks for your comments, Ron.  My fuseholder isn't gradually meltingit's a pretty robust one and teh spring effect is fine, but small contact area and dissimilar metals appears to be the issue.  It seems like the automotive blade fuses are the wave of the future in ham radio !   73, Steve

Re: [Elecraft] [K2] Diode types for connecting both paddle straight key

Thanks for your comments, Sverre and Mike.  Yes, I believe I have had RF-induced odd keying problems (with a transverter/amp on 144 MHz at about 100-300 W out, the key being around 5m from the antenna, but not in the main beam).  They seemed to respond to moving cables around, putting ferrite

[Elecraft] Chirp with K2/XV222 - Fuseholder Issues

It looks like one of the causes of my chirp on 222 MHz with the K2/XV222 combo was an unreliable fuseholder (an in-line type for an AGC/3AG/1-1/4x1/4 inch fuse).  I wonder if automotive blade type fuses/holders might be more reliable as far as contact resistance goes.  Does anyone have any

[Elecraft] [K2] Diode types for connecting both paddle straight key

I'm replacing a dead diode in my paddle/key combiner box.  Does it matter at all what types of diodes I use ?  I am thinking maybe I should use something less prone to RF pickup (say 1N4001 or similar) rather than the HP 5082-2835's (small signal schottkys) I had there originally.   73, Steve

[Elecraft] Chirp with K2/XV222

I got a report of chirp when running CW on 222 MHz during the VHF contest this past weekend.  This has been confirmed by a few others since the contest.  It's quite possible that the various voltage drops from the Rover vehicle battery to the XV222 were not leaving enough headroom for the 78L09

Re: [Elecraft] Chirp with K2/XV222

To: Steve Kavanagh skavanag...@yahoo.ca Cc: elecraft@mailman.qth.net elecraft@mailman.qth.net Sent: Tuesday, June 11, 2013 7:14:40 PM Subject: Re: [Elecraft] Chirp with K2/XV222 Steve, I would think your assumptions for the cause may be correct. BUT -- rather than changing the XV222, I would

Re: [Elecraft] [K2] Solutions for K2 Transverter Quirks

My apologies regarding the link...as W1RT correctly figured out there should be an L at the end of it: www.qsl.net/ve3sma/downloads.html I had seen Don's circuit and decided to go a different route...not having to dig into the K2 was a plus for me (and I had a good supply of the Omron G5Y

Re: [Elecraft] [K2] Solutions for K2 Transverter Quirks

--- On Tue, 11/8/11, Don Wilhelm w3...@embarqmail.com wrote: From: Don Wilhelm w3...@embarqmail.com Subject: Re: [Elecraft] [K2] Solutions for K2 Transverter Quirks To: Steve Kavanagh skavanag...@yahoo.ca Cc: elecraft@mailman.qth.net Received: Tuesday, November 8, 2011, 9:14 AM Steve

Re: [Elecraft] [K2] Solutions for K2 Transverter Quirks

--- On Tue, 11/8/11, Don Wilhelm wrote: Considering the source of your VHF energy, I would think that a low pass filter on the RX jack (as well as one just in case on the TX jack) would take care of that problem.  Actually, Don, it's the other way round. The offending detector is on the

[Elecraft] [K2] Solutions for K2 Transverter Quirks

The K2 makes quite a nice IF rig for VHF transverters, but it has a few quirks, like most rigs. I've put my solutions to two issues up at www.qsl.net/ve3sma/downloads.htm . First is a sequencer which switches the RF to the transverter to prevent it from transmitting while its internal

[Elecraft] KX3 Batttery life question..

We were thinking along the lines of 200-500 mW for the micro transverter, if it's even possible. The regular transverter option could be as high as 5 W. We'll see. Wayne N6KR Now that sounds interesting. I run a bunch of microwave transverters from a 2m IF at 50-100 mW and have found no

[Elecraft] [K2] EMC issues with K2/K60XV

Recently I noticed some odd behaviour of the K2/K60XV driving a DEMI 2m transverter and an amp. Switching on and off my rotor control box or the AC-powered fan for the amp caused the K2 to do the following: (1) receiver muted for about 1 second, (2) S-meter read S9+40 dB for the same time and

Re: [Elecraft] XV432 Oscillates with Amp connected

Stu A couple of thoughts. You didn't mention if the oscillation was occurring with the amp driving an antenna or a dummy load. The Elecraft transverters have lots of nice features but they are quite poorly shielded. If you were using an antenna you might be getting an RF feedback loop

[Elecraft] [K2] What happens above 28.8 MHz ?

I was just pondering if I could use my K2 for transverter operation at 29.4 MHz, despite the specified upper frequency limit on 10m being 28.8 MHz. On my unit, at least, the VCO still works. I can hear signals but it seems they are probably a bit attenuated. Does anyone have real data on how

Re: [Elecraft] K3/10 in Attic Looking for Six Meters

Frank: I have done quite a bit of operating on 6m SSB with 10 watts and a dipole (and in the past with 2 watts and a dipole). Unfortunately I haven't had a K3 to do it with, but one the current versions is a K2 and homebrew transverter. My dipole heights have ranged from 12 feet to 30 feet,

[Elecraft] [K2] ALC and power control on 40m SSB in K2/100

John: The values I used are in the 1st link I sent, if you dig down far enough. I put a 1k resistor in series with the base of Q1 in the KSB2 and put 3.3k in parallel with R9. It's pretty fiddly work on this compact board, but doable. This is in the middle of the range for R9 suggested

Re: [Elecraft] [K2] ALC and power control on 40m SSB in K2/100

Is there any way of making the ALC more aggressive on 40m SSB, without affecting the other bands too much?  I remember seeing a previous post about this somewhere but haven't been able to find the details again. Any suggestions? 73, John VK7JB John: You probably have the diagnosis exactly

Re: [Elecraft] K2 KPA/100 excessive power issue, SSB mode, some bands

Ken: The excessive power could also be due to a problem some of us have had where the KPA100 gain is high enough that the ALC circuits do not have enough range to control the power on some bands (typically 80m and/or 40m). Only SSB is affected, not CW. See:

Re: [Elecraft] K2-XV222 RFI Susceptibility Problems - a solution found

That filter has pretty much the same attenuation at 50 MHz as my homebrew one, so yes, it should work fine. Mine has better match at 28 MHz, at the expense of not as good match at lower frequencies. I ended up with the following, after some tweaking My filter is a two section low-pass

[Elecraft] K2-XV222 RFI Susceptibility Problems - a solution found

A couple of weeks ago I posted here regarding a problem whereby transmitting on my 6m rig cause my XV222 (connected to K2/K60XV) to key up. It appears that if any moderate amount of stray RF ends up on the tranmit IF line (probably due to imperfect shielding of the transverter rear panel

Re: [Elecraft] K2 unadvertised feature ?

I just tried another test, which I think tends to confirm my theory in some way (or that something is amiss). When I apply my 0.5 mW 146 MHz test source to the XVTR OUT jack, the DC voltage at the cathode of D3 in the K60XV (the detector for VRFDET) increases from zero to about 0.1 volts. So

Re: [Elecraft] K3 transverter output question

Terry: I have seen much the same thing with a DEM transverter and my K2, and I agree with your assessment. The IF circuitry in the DEM transverters does not seem to be designed to give anything close to a 50 ohm input impedance, especially when set for for very low input powers. It is quite

Re: [Elecraft] K2 unadvertised feature ?

Thanks for taking the time to consider my problem, Don. Here's a few more observations. If the 8R line in the K2 goes low, it is because the K2 has entered the transmit state. You'd think so, but since the display does not show a frequency change between the receive state and the

Re: [Elecraft] K2 unadvertised feature ?

Don: Thanks for the quick reply ! I'd reply off list with the nitty gritty details but I did have a request from another interested ham to make the results public. I have now put together a much more controlled test setup for the K2 that doesn't involve high levels of RF all over the shack !

[Elecraft] K2 unadvertised feature ?

Does the K2 have a feature where a sufficiently high V RFDET voltage causes the 8R line to go low, thus switching the PIN (1N4007) diodes and protecting the receiver from damage if high power is applied to the antenna socket while receiving ? If so this would explain the behaviour I have been

[Elecraft] K2-XV222 RFI Susceptibility Problems

MHz from where the K2 is receiving ? 73, Steve Kavanagh VE3SMA __ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/ ___ Elecraft mailing list Post

[Elecraft] K2 8R/keyline-RF Timing Questions

I read on this forum that there is about 15 milliseconds delay between the transition of the 8R line from receive to transmit (and hence of the key out lines in the KPA100 and K60XV) and the beginning of RF output. I have a couple of questions with respect to this delay: (1) Does this apply on

[Elecraft] K2 - K60XV with DEMI 2m Transverter

A local has a current-model Down East Microwave 2m transverter for sale which I am considering for use with my K2. From this forum and relay data sheets it looks like the transverter will switch fast enough that it can be used with the K60XV keying output without a sequencer, with no hot

[Elecraft] K2 - K60XV Transverter Keying Output Questions

I am part way through the build of my K60XV and am trying to sort out how to interface it to my various existing homebrew and non-Elecraft transverters. A couple of questions have arisen: (1) I hope to use the transverter keyline output (J2-pin 2 on the K60XV), but there is no connector (or

[Elecraft] Unstable power control on 40M SSB

Bill: It could be the problem I and some others had, where there was a bit too much gain through the transmit chain when the KPA-100 is installed for the ALC to maintain control (in my case it was worst on 80m). Here is a link to my problem solved post, which also links to my original problem

Re: [Elecraft] SSB output overshoot

--- Geoffrey Mackenzie-Kennedy [EMAIL PROTECTED] wrote: Have you any thoughts about what might be causing Don's K2/100 to behave when he switches the display from RF to ALC? Yes, that is quite unexpected ! David, M0DHO, brought this peculiarity to my attention and I noticed the same

Re: [Elecraft] SSB output overshoot

I think Don's observations sound like the problem I and a few others have had. See, for example the symptoms described here: http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-03/msg00676.html http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.html These two, at least,

RE: [Elecraft] KPA-100 Problems

A few recent units have shown problems that at least sound similar to this one. See, for example: http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-03/msg00676.html http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.html These two, at least, were due to the KSB2 ALC

Re:[Elecraft] K2 KSB2 TX off frequency

Raj: I trust you didn't have the RIT on by mistake ? I find I often leave the RIT on and forget about it with the K2. The flashing indicator just doesn't seem to be obvious enough to me to remind me to turn it off. 73, Steve VE3SMA __ Do You

Re: [Elecraft] K2 and Ten Tec 1210

I just purchased a used 1210 yesterday with the idea to use it with my K2...I haven't tried it yet. Lee, I should have it on the air for initial tests within a few days and can report. But I am confused about noise figure specs. The manual (copyright 1997) I received with it specifies a 2 dB

Re:[Elecraft] K2 Linear Amp Driving Power

Roy: I assume you are probably making these measurements/observations on CW, in which case I can't add to what has already been suggested. However, if you are testing in SSB mode, there is another possibility. Some K2/100's have trouble keeping the power down on SSB, especially on 80m. The

Re: [Elecraft] multiple XV in high-power rover .. anyone else doing this?

John: I think I recall a post here where someone had blown up an XV front end in a rover setup by transmitting on an adjacent band (as I recall at the 100-200 W level). There's just one tuned circuit in front of the preamp FET in the XV's, so bandpass filters wouldn't be a bad idea. By the way,

Re:[Elecraft] k2 alc on 40 ssb

Juha: It sounds something like the problem I had (and have still not completely fixed as it got a bit worse when I installed the new resistors per Builder Alert 22A). See http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.html M0DHO had the same problemsee

[Elecraft] K2/100 AM (MW) Broadcast Intermods on 80m - Partial Conclusions

Regarding the thread I started a couple of weeks ago... I found some strong intermod products from AM (medium wave) broadcast stations on and around 80m when using a large inverted L and low-pass L-network antenna tuner. The strongest was the combination of 2 x 1310 kHz + 580 kHz, two local 50

[Elecraft] Relay Removal Results

Thanks to all who shared their experience and suggestions. Some interesting approaches indeed. I decided to try the spring-loaded solder sucker method, since one was available. It worked well enough (in conjunction with a bit of lead prodding) on all the ungrounded pins, but I couldn't get the

[Elecraft] Relay Removal ?

OK, while everyone seems to be on the subject of stupidity...I just found I installed two of Elecraft's ubiquitous latching relays incorrectly (after several checks to make sure it was done right !). Has anyone ever successfully unsoldered one without serious damage to either the relay or the

Re: [Elecraft] K2/100 AM (MW) Broadcast Intermods on 80m

As far as I can see from the manual, the KPA100 T-R switch is bypassed in QRP mode. As the intermods occur in both QRP and high power modes the KPA100 T-R switch can not be the only culprit. With more careful observations I see that there are fairly small changes in the S-meter readings on the

Re: [Elecraft] K2/100 SSB Power Control Problem

Thanks to advice from M0DHO, LA3ZA and Gary Surrency at Elecraft the problem described in http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-12/msg00408.html is now solved, or nearly so. I still see a big jump in SSB power between 10 and 11 watt settings, but the power output is always

[Elecraft] K2/100 AM (MW) Broadcast Intermods on 80m

I just had my first opportunity to use the K2/100 on a fairly large antenna for 80m (inverted L with total wire length around 150 ft., through a low-pass type of antenna tuner). I noticed a few fairly strong intermodulation products from AM (medium wave) broadcast stations on and around 80m.

[Elecraft] K2/100 SSB Power Control Problem

When I try to run SSB on 80, 40 or 30m (the latter for purposes of completeness only !) at power levels above 10 W but below 100 W I find the power control is not working properly. There is no problem on CW, or above 14 MHz, or below 10 watts. S/N is 4509. Here are some typical measured numbers

RE: [Elecraft] K2/100 RFI problem using Astron 20A

This summer I experienced an RFI problem with my Astron RS-7A which was completely cured by connecting the negative output terminal to the ground stud on the back of the supply. Never had to do that before in perhaps 15 years of owning the power supply - didn't even know the supply was floating

[Elecraft] K2 - Do Builder Alert 22a Upgrade ?

I purchased a recently built K2/100 this summer and am gradually working my way through careful evaluations. Today I checked the key-down current and found some variations that look rather like those mentioned in Builder Alert #22a. Here are the current readings in amps, at 75 and 100 watts