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

y nice QSOs with the setup.  73,  Dave, K4TO  On Sat, May 19,  2018 at 1:18 PM Steve Kavanagh via Elecraft <elecraft@mailman.qth.net>  wrote:  The K2 is specified to operate  on 10m only up to 28.8 MHz.  While contemplating possible  future VHF rigs for a mult

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

rs as 902/903 is a trashy band anyway.  I have made many nice QSOs with the setup. 73, Dave, K4TO On Sat, May 19, 2018 at 1:18 PM Steve Kavanagh via Elecraft <elecraft@mailman.qth.net> wrote: The K2 is specified to operate on 10m only up to 28.8 MHz.  While contemplating possible fut

[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

g 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 dis

[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