[Elecraft] K3 internittent and random transmit

I was on 15M SSB and as I tuned, the K3 went into transmit mode briefly two or three times, each for a fraction of a second. Radio was in PTT mode, not VOX. Main menu and Config menu are set exactly the same as in the manual. It seemed to do this when I tuned up in frequency past 21.306 and 21.373

[Elecraft] K3 set up for RTTY and PSK

I seem to have a problem setting up my K3 for PSK and RTTY. I use a computer with mike input and headphone output to connect to line out and line in of the K3. I have the K3 set for VOX. Intermittently, the K3 goes into transmit mode without sending tones from the computer.If I turn dow

[Elecraft] K3 volume level with NR

I think that Wayne has mentioned the differences in an earlier post. The first four NR settings F1-x to F4-x are for CW ONLY, F5-x and higher are for SSB. The different NR settings are not called out as well as they might have been in the manual. I, too first tried F1-1 through F4-7 for SSB

[Elecraft] K3 and Steppir antenna

I have a K3 and would like to control the Steppir band and frequency segment selection via the Steppir data port. I am confused as to what is needed. I do not have a computer attached to the K3 nor the Steppir. Any advice as to what to do? Thanks Rich W3ACO __

Re: [Elecraft] K2 100 watt PA problem

I am almost finished building the KPA100 amplifier. Presently I am on Page 47 of the K2 Appendix G 100 W stage and RS-232 (K2/100) Ref F October 7, 2009. Pg 47 Left column. All voltages check OK. Pg 47 Right column under Receiver tests: Step 1. Plugging in headphone jack to the K2, I get audi

[Elecraft] Re Keyer dash squeeze override

You should take a look at N4YG keyer. I have two, for a K3 and a K2 and they work great, both from the keyboard and from paddles. I think from the paddles, this keyer will do what you want. I don't use the radio internal keyers at all. Both radios work just great. I think the keyer options in th

[Elecraft] K3 and Toyko HY-Power

I use the Toyko Hy-Power 1.2KFX without ALC and my QRP K3. I can't overdrive the amplifier and it works just great. My HL1.2 KFX is modified. I removed the input attenuator from the HL1.2KFX so my 12 watts gives me 600 watts typical. Remember, ALC feedback takes time, so the amplifier chain o

[Elecraft] K3 gain changes with filter selection

I have a K3 with three filters, 2.7 KHz (FL1) , 400 Hz(FL2) and 200 Hz ( FL3) . When I reduce the bandwidth from 4.0 KHz, the radio performs as expected EXCEPT when the the different filter switches in. When I reduce the bandwidth and it switches from FL1 to FL2, the receiver gain goes up at l

[Elecraft] K3 QRP output power level

Hello all, I am confused about the output level of the K3. What is the output power level of the 10 Watt version of the K3?. Is it the same on all bands? Do I have to reduce the output below 10 watts to avoid poor transmit intermod on SSB? I am asking this because I use my present K2 QRP radio to

[Elecraft] Good headphones for K2

I've come across a good set of stereo headphones at my local Radio Shack for use with my K2. They have good output and I like them because they have a foam ring that completely encloses the ear which cuts out a lot of noise. They also fold up for portable use. The RS number is 33-1221. I think t

[Elecraft] K2 stops keying

I have a weird problem. I'm running my K2 about 10 watts into an amplifier. When I am in a ragchew QSO on CW, the K2 stops keying after about 60-90 seconds. In other words it doesn't go into TX at all. I get an elecraft message on the display and my Split operation disappears After I wait for abo

[Elecraft] Power amplifier for K2

For those who don't want to wait for the Elecraft linear amplifiers, here is an option that I pursued. I bought a Tokyo Hi-power amplifier the HL 1.2KFS that is rated at 750 watts output with typically 60 watts drive. But here is what I did, I asked Nobuki San, the chief engineer, to set up the

[Elecraft] hoisting line for wire antennas

I've come across some braided Dacron line for raising wire antennas at a very good price. It's really kite line. Kitebuilders.com has 1640 ft roll of 200 pound test for only $25.00. that's less than .02 per foot, not bad !!. A bought a roll, this much line will probably last me forever. It co

[Elecraft] re attic antennas and ground radials

>From the previous discussions, I agree that there is no magic in having low VSWR across many bands without a tuner or a resistor buried in the "matching unit". However there is a way to have good vertically polarized radiation without ground radials. One example of these is the end-fed 1/2 wave

[Elecraft] re attic antennas

Par Electronics end fed antennas (single band) are now rated at 100 watts, not QRP as I noted in my earlier e-mail, They appear to also make multiband antenna with a 20 watt rating as well. Sorry !! Rich W3ACO ___ Elecraft mailing list Post to: Elecr

[Elecraft] Looking for some foam.

I would suggest visiting an upholstery shop. They have foam for pillows and sofas in different densities. Pick what you like. For the amount you need, there may be some small pieces available at no charge. Just my $.02 worth. Rich W3ACO ___ Elecraft

[Elecraft] RTTY with K2

I am wondering if anyone has modified their K2 to transmit RTTY using FSK, not AFSK. It seems that if XIT were used somehow, I could get the 170 Hz shift by feeding the K2's pseudo"RS232" connector from my lap top computer com port. I do not want to feed audio into the mike connector for AFSK.

[Elecraft] update older k2

I have an opportunity to purchase a second K2, serial number 008xx. It has the SSB and noise blanker modules installed. What upgrades/modifications are suggested to bring it up to at least the S/N 4500 performance? Any suggestions are appreciated Rich W3ACO K2 S/N 4023 __

[Elecraft] Re: tube amplifiers and polyproplene capacitors

Those who get sold by high end audio salesmen seem to believe the garbage they tell you after a while. I was told once at a high end stereo shop that I should buy this special speaker wire. It was stranded copper and each strand was individually gold plated to avoid corrosion that caused distorti

[Elecraft] PAC-12 Antenna

I built a PAC-12 antenna for my K2 (low power version) about 2 years ago. I used #14 solid copper insulated house wire on 1" PVC pipe for my coils. I made coils for 40M thourgh 10M. I use 4 radials made from 22 ga twin speaker wire for all bands, using 16 foot ones for 40M, 20M and 15M, and 8 1

[Elecraft] Power amplifier

I agree with several who voiced their opinion about what power level the new amplifier should be. IMHO 400 watts is plenty. I made my own 400 watt PA driven by my dependable K2 S/N 40xx. It works fine. With a 2 element switched beam (non rotating) up at 30 ft. I can work everything I can he

[Elecraft] inoperative KNB2

My KNB2 noise blanker doesn't appear to work hardly at all. It never has worked well since I built it. I recently downloaded some notes that Gary Surrency sent to K0WA. Gary's comments include the following: "You can check to see if Noise Gate Q5 is blanking by touching a resistor of 1K - 2K to

[Elecraft] external keying with the K2

Does anyone know how to "disable" the auto keyer in the K2? I want to use the Idiom Press CMOS 4 keyer and feed the K2 via the key jack in the rear. Thanks ahead of time Rich W3ACO ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must

[Elecraft] re: KNB2 non operation

Thanks to Sverre Holm for giving me the test approach to find my problem. Scratching Q21 on the main board gave me sufficient noise pulses to trace the noise blanker operation using my OLD scope. My problem was Q5, the noise gate transistor. Good drive pulses to the base, but since there is n

[Elecraft] KNB@ non-operation

It appears that my noise blanker doesn't operate at all. Receiver gain is fine with the KNB2 installed. It's that when I call for NB operation on impulse noise, there is no noise reduction at all. I have checked the one-shot and it fires OK, the serial control IC seems to work OK, the control s

[Elecraft] Re: Measure Capacitance

It seems several hams on this reflector have had difficulty reading and measuring small capacitors (like me!!) . I recently purchased an L/C meter from almost all digital electronics, AADE, www.aade.com. This is not a DMM but measures inductance and capacitance only. It can measure capacitance

[Elecraft] Re: 48 volt power supplies for amplifiers

Original message below: From: Steve Jackson <[EMAIL PROTECTED]> Subject: [Elecraft] 48V, plus or minus, usually >> It's that 50 volt 20 amp supply >> that's a killer! Actually, this voltage/current is very easy to comeby, and relatively low in cost. The telephone industry uses this voltage and at

[Elecraft] Power Amplifier for K2

For those who think life is too short to do QRP all the time, here is what I did. I made an amplifier similar to the amp in Communication Concepts web page, specifically the Motorola EB-104 Amplifier (kit!) that uses 4 MRF-150 transistors. See www.communication-concepts.com/eb104.htm. I use 48 vo

[Elecraft] LC meter

I purchased an LC meter from almost all digital electronics. Here is their web site. http://www.aade.com/lcmeter.htm I used it to select capacitor values and build inductors for four 7 branch low pass filters for my linear amp. ( That is driven by a K2 naturally!) I am satisfied that it has

[Elecraft] Re: K2 Noise Blanker

I have a K2 S/N 4023 which works very well. I think I have a problem with the noise blanker. On NB1, there is no difference between this setting and off. I am trying to eliminate ignition noise from nearby cars. With the noise blanker set to NB2, there is a significant reduction in volume and it