Re: [Elecraft] K3 and 4m Transverter

Jukka K3 and OZ2M tvtr used here for several years now. http://www.g3tct.co.uk/equipment.html Graham On 19:59, Jukka Kulha wrote: Also interested if any recommendation for other 4m transverters used with K3. __ Elecraft mailing

Re: [Elecraft] K3 6m noise figure

Hi Peter I measured mine at 13dB about 5 years ago, using a signal generator, so not particularly accurate. I use a homebrew preamp on 6m. 73 Graham On 19:59, Peter Torry wrote: I am trying to calculate my link budget for 50 MHz and was wondering if anyone has measured the K3 noise figure

Re: [Elecraft] diversity receive what bands

Used also on 6m - http://www.g3tct.co.uk/diversity.html Graham __ 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

[Elecraft] P3 f/w 1.26 slow to respond to span changes

Hi all Recently I updated my P3 f/w from beta 1.08 to 1.26. Just noticed that changing the span has now become rather clunky - it only changes about twice a second, whereas before it changed immediately. I've reloaded 1.08 to check and this seems to be a feature of v1.26. Any chance of

[Elecraft] P3 - use as a transmit monitor

Several writers have commented that it would be very useful to be able to monitor one's transmission using the P3. Well it is possible, although it's not something you'd want to do all the time. I've detailed how to do it and shown some results on my page here:-

Re: [Elecraft] K2 EXCESSIVE PREAMP NOISE?

Paul The key question is whether the signal to noise ratio is the same or better with the preamp on than with it off. If not, it's faulty. Graham On 19:59, N2PD wrote: Don, thanks for your response. I am out of town on vacation at present and the rig is home, so can't measure now. FYI, I

Re: [Elecraft] Keying External Amps

I use a little plastic box with a 4 way switch to switch the ptt line between linear, 2 transverters and a spare position. Cheap and simple! Graham On 19:59, Richard Thorpe wrote: What are people doing out there to key more than one external amp? I want to key a 2 meter block without keying

Re: [Elecraft] K3 Requested Change Ideas

On 6m, select cw mode and then _hold _the alt button. It will change to cw-rev which is then the right sideband. It's magic! 73 Graham 2. The CW during SSB is a good function particularly on 6 meters, but it will normally transmit on the wrong sideband. Could the CW during SSB selection

Re: [Elecraft] K3- hearing 10-11m above 44 MHz

Hi Mic The IF is 8.215, so the image will be on 44.68MHz. Or listening on 44.676, the image will be on 28.246. Does this explain it? BTW, I found that the main rx had quite good image rejection, but the subreceiver is not so good. I designed a filter for the subreceiver to deal with this -

[Elecraft] KX3 laptop question (was odds and ends...)

If I want to use a small laptop with the KX3 to display the spectrum when out portable, does anyone have a suggestion for such small device with stereo input? Preferably without a separate sound card. Graham On 19:59, Richard Ferch wrote: I have no way to get stereo input into this sound

Re: [Elecraft] K3 Mics

I have been using a computer style headset and mic bought from a rally for about £2. Reports have been very complimentary and it even has its own volume control. I just bought another one as a spare for £1. Can't get better value than that! Graham On 19:59, paul ecker wrote: - My question

Re: [Elecraft] K3 - How to scan while tuning sub RX

Thanks for the suggestion Rich. I tried this and it works, sort of. The problem is the K3's scanning algorithm - in ssb / fine, it scans much too slowly, and in coarse it's too fast and goes past the signal before it stops. Generally the scanning is too insensitive and anything below S3 on

Re: [Elecraft] K3/KX3 Operating Tip: APF (audio peaking filter) for weak-signal CW work

I support Ian's suggested option. My previous question about using a programmable function is (I now realise) useless (as is using a macro) because they all need a hold on a button, and we've already got that! On 19:59, Ian White GM3SEK wrote: [snip] I was only suggesting ONE new option.

Re: [Elecraft] K3/KX3 Operating Tip: APF (audio peaking filter) for weak-signal CW work

I find APF very useful for VHF/UHF work too, and the need to hold the button a problem. How about making it possible to switch the APF on and off through a programmable function button - is that an option? Graham On 19:59, Joe Subich, W4TV wrote: And the point is: it's fixable. It is not

Re: [Elecraft] [Elecraft_K3] Re: My K3 is Due Tomorrow 11/11/11 !

I've just measured my a/s mat. I used two small metal boxes about 4 x 2, spaced 3. I applied 13V thru my DMM and pressed fairly hard (thru' good insulation!) to get 0.2uA, giving a value of 65Mohm. RH here is probably 60% or more. Pressing lightly gives 0.1uA, the smallest the DMM indicates.

Re: [Elecraft] SDR-IF and I/Q questions

David Space diversity with the K3 is an interesting idea. A variable phase shift could be achieved by adding the raw audio from main rx to a 90degree phase shifted version of itself. Adjusting the relative amplitude of the 90deg version will then vary the resultant phase. Is a phase shift at

[Elecraft] K3 QSK - not so good?

OK, I'll put my head in the lion's mouth. I'm using qsk on cw and I find that if the rf gain is turned up to hear some background noise, there's a transient or click when the rig switches to rx (but not when it switches from rx to tx). To hear this really badly, try opening the cw b/w up to

Re: [Elecraft] [K3] Noise from P3

On 19:59, John Lemay wrote: Well, I have undertaken a lot of work to address this problem:- John have you tried disconnecting the RS232 connection between K3 and P3? Graham G3TCT __ Elecraft mailing list Home:

[Elecraft] P3 with a transverter

I just installed f/w 4.25 on the K3 and 1.00 on the P3, and I'm having problems when using a transverter. In P3's fixed tune mode, if I move VFO A slightly, the frequency displayed on the P3 changes to the 28MHz IF frequency and the U shaped indicator of bandwidth disappears. If I then press

Re: [Elecraft] K3 RX spurs

Ramiro I don't see any difference here between USB, CW and Data. Third order products are about 45-50dB down here, whereas yours seem to be about 20dB down (difficult to see on the spectrum though). Maybe your sound card input is being over-driven? Graham On 19:59, Ramiro Aceves wrote:

[Elecraft] P3 - UK import duty

I bought a P3 kit which arrived in October with a demand for import duty (as well as VAT). I believe this is incorrect and have queried this with the UK Border Agency. Has anyone else in UK had this problem? Graham __ Elecraft

Re: [Elecraft] KPA-500 Features and Pricing

I currently use an Acom 1000 amp on 80 and 6m and a homebrew semiconductor amp (160W o/p) on 4m. The features I really like about solid state amps is their efficiency (50-60%), and zero warm up time. I often find on 6m that I can hear interesting but very weak dx that needs the amp, but I have

Re: [Elecraft] Need K3 dB Measurements on new 160M Antenna

Jim Afraid I can't help with listening on 160, but an interesting topic, and a measurement technique applicable to other situations. My observation is that the mental averaging will be rather tricky, especially if the QSB is slow and unpredictable. What we need is something (software?) which will

Re: [Elecraft] VHF Diversity

I've been making a few recordings of signals on 6m during recent Es events, using polarisation diversity and the K3 subrx. The results are quite amusing - see www.g3tct.co.uk/diversity.html BTW the K3 has been great - 13 new dxcc on 6m and 3 new ones on 4m in May and June. 73 Graham

Re: [Elecraft] K3 PR6 preamp

Ed There's a more reliable way of doing this. Turn on the dBV measurement facility on the K3 and turn off the agc, reduce rf gain a bit. Arrange for 50ohm resistor noise to indicate 0dB and then substitute the 6m antenna and see the difference. BTW the preamps won't be below a 290K source -

Re: [Elecraft] Semi-OT: seeking circuit designs for 2 meter LPF

Hi Lew You could try a coax stub filter - see the one by G4SWX and described on the G(M)3SEK website http://www.ifwtech.co.uk/g3sek/in-prac/index.htm (Look for Filters: Harmonic notch filters under The Best of In Practice). I built one for 70MHz using RG58 and it works fine at 160W. The article

[Elecraft] K3 Subrx spurious responses

My subrx shows spurious responses when tuned to the 50MHz band - I found FM b/c signals audible. When I measured the response I found 92.1MHz -57dB 75.6MHz -54dB 117.6MHz -38dB 134.0MHz -43dB due to harmonics of the local oscillator. Guess I'll have to make myself a low pass

Re: [Elecraft] K3 Diversity and mode changes

Don Thanks for the clarification. I hadn't realised the sub tracked the main rx invisibly as it were - I was expecting VFO B to change, but now it's clear. Great! Graham - Original Message - From: Don Wilhelm w3...@embarqmail.com To: Graham Kimbell (G3TCT) g3...@lineone.net Cc: Elecraft

[Elecraft] K3 Diversity and mode changes

I'm playing with diversity operation and find that when I change modes say from usb to cw, the main rx changes frequency slightly to keep the received tone the same (as expected), but the sub rx doesn't change frequency. This is not a big deal because I can tap A-B to force the frequencies

Re: [Elecraft] K3 Survey

I certainly go along with this enhanced user manual. I don't mind if it's a document or web-based, but it must be searchable for a given word or phrase. It's becoming very difficult to keep track of what's possible / already included. Graham - Original Message - From: eric norris

Re: [Elecraft] K3 survey -- memory scanning

I would certainly find it helpful if the memory function was improved. The ability to scan through tv and beacon channels is an important way of spotting openings on 6m, and would be assisted by - recalling mode as well as frequency, - allowing selection of mode specific scanning or all mode

Re: [Elecraft] K3 Main RF Gain problem

Jim I've had exactly your problem (and sorry for rather late response). I'm using Windows (so it's not that) and it's not the encoder/pot, it's the rf gain calibration. I've posted on this before and there's been a change to the rf gain setup since f/w 3.27. Wes has also mentioned that fets have

Re: [Elecraft] Noisy K3 receiver

Wes, thanks for the insight and it's interesting someone else has the same problem (s meter behaving oddly when rf gain backed off, plus noisy rx). In my case I had calibrated the rf gain using an external sig gen. I asked elecraft support about this and at Dale's suggestion I redid the

Re: [Elecraft] Noisy K-3 Receiver

This statement (If you run RF GAIN wide open the receiver will sound noisy and you are limiting your dynamic range) is only true for the bands where the band noise is high, but on the higher bands (eg 6m), the band noise is only a little higher than the receiver noise (and maybe not at all if you

Re: [Elecraft] Noisy K-3 Receiver

Wilhelm w3...@embarqmail.com To: Graham Kimbell (G3TCT) g3...@lineone.net Cc: Elecraft reflector elecraft@mailman.qth.net Sent: Thursday, December 17, 2009 6:36 PM Subject: Re: [Elecraft] Noisy K-3 Receiver Graham, BUT - the K3 RF Gain control ONLY controls the IF gain - it does not reduce the gain

[Elecraft] K3 weird RF gain behaviour

I've just upgraded from firmware 3.27 to 3.63, and the gain balance in the rx has been altered significantly. The rf gain now reduces the S/N quite noticeably as soon as it is rotated counter clockwise from max, suggesting the gain is being mostly backed off at the rx front end, leaving the IF

[Elecraft] K3 coarse tuning in a transverter band

I've just upgraded from firmware 3.27 to 3.63. I used the VFO CRS menu entry to select RND= YES so that the RIT knob moves the VFO correctly eg 1kHz steps and rounded. It works fine on the standard bands. However on switching to a transverter band, the frequency is rounded to 20Hz away due to

[Elecraft] K3 More Magic

Just like to say that I have been using the latest 3.19 firmware and I _really_ appreciate the automatic VFO offset when switching from ssb to cw. I've set it up for the higher bands on usb/cw rev and it means I don't lose the signal completely like most other rigs do - great stuff! Graham

Re: [Elecraft] K3 VFO tuning hash

This noise was previously reported under the title K3 Tuning encoder pulses and birdie problem In my case it is only noticeable at the low end of 28MHz when there is a low noise level from the antenna or with a dummy load attached. Wayne suggested using the noise blanker on a low setting like

Re: [Elecraft] K144XV

John USPO priority mail looks a lot cheaper? Graham - Original Message - From: John Lemay j...@carltonhouse.eclipse.co.uk To: elecraft@mailman.qth.net Sent: Wednesday, May 27, 2009 8:43 AM Subject: [Elecraft] K144XV Hi all I'm really keen on the 2m transverter module, but having

Re: [Elecraft] KXV3 versus KXV3a

From: Mark Bayern plcm...@gmail.com 70MHz? How much of the world has a 4 meter (metre?) allocation? At the latest count some 19 DXCCs have access to 4m, with quite a few more equipped for crossband, and pushing their administrations for an allocation. See http://www.70mhz.org/bands.htm And

Re: [Elecraft] Six-meter scanning

Given that the FCC has no jurisdiction outside the US, can we non-US guys be given a fix for this? And what's so wrong about scanning outside ham bands anyway - I've been listening to band 1 TV carriers for decades! Graham David Woolley (E.L) wrote Wes Stewart wrote: There was some talk

[Elecraft] [Elecraft} K3 power control in ssb

Others have already mentioned this as a problem and I have just tested my K3 #1198 driving an Acom 1000 amp into a dummy load with the following results. Condx:- 3.7MHz, 25w drive to get 392w o/p on cw. I have TXG VCE set to -1.5dB, mic 15, cmp 24. In lsb and then key down I adjust to just

Re: [Elecraft] K3 AM reception

Re the AM quality question I can't detect any clicking or other distortion but then there are no high quality AM BC transmissions round here - they're messed up either with selective fading or because the transmission comes from more than one location on the same frequency. The noise in between a

Re: [Elecraft] [K3] A couple of KRX3 observations

Retry after mail failure. Toby DJ7MGQ wrote: Also, I discovered last Monday that I can still, weakly, hear knob encoder noises, this time on 50MHz and only (?!?) with an antenna connected , which strikes me as strange. My K3 also exhibits what I assume is encoder noise - ie noise

Re: [Elecraft] K3: spurious CW T/R switching while VOX off

Mario said What I noticed is that in CW mode, with VOX/QSK to OFF, when accidentally hitting the paddle, the T/R and all the other connected relays would spring into full-qsk-style action, ie. activate for each single dot (with PTT/XMit not pressed). No HF is being generated. I agree

Re: [Elecraft] [Fwd: Re: Elecraft list users in UK being blocked]

Eric Thanks for following up and for the clarification. Thanks to others who made suggestions eg on changing ISP or re-registering. Seems like it's working ok today - if the reflector gets this! 73 Graham In general , it looks like once you are subscribed to the list for 24 hours with a new

[Elecraft] K3 Channel hopping mode

I found Wayne's explanation on how to set up channels so you can instantly hop between them useful as I want to use this feature on vhf. I agree with Joe's comment below and also when he says When in 'channel hopping' mode, it might be nice to momentarily display the memory number and text

Re: [Elecraft] Re: Cannot post to Reflector TEST MESSAGE

My emails are being blocked with the message:- host mailman.qth.net [63.238.179.60]: 554 Service unavailable; Client host [84.234.17.142] blocked using uk.countries.nerd.dk; Your IP is in uk, rejected based on geographical location I am surprised the spam blocking system allows this to happen. It

Re: [Elecraft] K3 RF-out spikes, was: K3 SSB Power Control and ALC Metering

I tested my rig using dummy load and scope. My rig is serial 1198, using f/w 2.38 and dsp 1.90. I don't see any spike in output. On cw the o/p power on key down is initially about 95% of the set value and then rises to the set value. I tested this on all bands using 51w o/p. On ssb the peak

Re: [Elecraft] K3 RF-out spikes, was: K3 SSB Power Control and ALCMetering

on ssb as near as I can tell. I haven't noticed any change in this area from firmware changes. Hope this helps. Graham - Original Message - From: [EMAIL PROTECTED] To: Graham Kimbell (G3TCT) [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Sent: Friday, September 26, 2008 10:53 AM Subject: Re

Re: [Elecraft] K3 RF-out spikes, was: K3 SSB Power Control andALCMetering

Toby A couple of thoughts - have you looked at the power supply regulation - it might be reacting badly to the sudden key down. The other thought is whether RF is getting into something - this can cause all manner of strange effects, I've even had multimeters giving nonsense measurements through

[Elecraft] K3: S meter calibration

I get very optimistic readings on my S meter above S9. I calibrated the S meter on 7MHz as per instructions and everything seemed ok with SMTR OF =26. According to my calculation 50uV is -73dBm. I increased the input and got the following readings:- -53dBm (should be S9+20) reads 9+30 on 6m

[Elecraft] K3: 6m performance and preamp

I have measured the 6m sensitivity of my K3 #1198 using a sig gen and two methods of measuring the output signal level of the K3. I measure the noise floor of the K3 (50.015, preamp on, usb, 2.3kHz bandwidth, agc off) at -127.1dBm. Using the calculation provided by Ian GM3SEK (RadCom Oct 1999) I

[Elecraft] K3 - Katiegram birth of #1198

I'm happy to report birth of K3 #1198:- Ordered 17 Feb 08 Katiegram 29 June Shipped 2 July Back-ordered KRX3, KDVR3, 6k filter Received safely (in rural Somerset) 4 July!! UPS were really quick! Built apart from 100W PA 6 July Thanks to all at Elecraft including Wayne, Eric, Katie, Madelyn and