[Elecraft] KPA100 Middle Side Screw Alteration

I wonder if anyone has considered drilling out a hole in the middle side screw location on the KPA-100 big enough to force in an externally splined insert that has a 4-40 internal thread. The external spline would make the insert grab the heat sink firmly so it would not turn with the scre

[Elecraft] No Audio in K2

My K2/100 occasionally loses audio when it has been on a while with the AF GAIN turned down (K2 on butnotbeingused). My K2 is an early model in the 2200 series serial number, and the AF mod was done. It also has the KDSP2 and the 10th digit CW LED zero tuning mod. Whenever I lose the audio

[Elecraft] Power to K2/100 Observation

I found that powering the K2 and the KPA100 separately causes the resistor R13 in the KPA100 to get hot to the touch. When the power is removed from the K2 and using power only to the KPA100, R13 runs cool. Maybe R13 was put behind the fan for a reason. I believe it it best to run the K2/

[Elecraft] K2/100 with Alpha 99

Is it possible to key the K2/100 for CW QSK operation with the Alpha 99. If so, how should the delay be set in the K2. I would rather key the K2 first rather than keying the Alpha 99 and running the keying line back to the K2. Roy Morris W4WFB However if you get a QSK amp, like some of

[Elecraft] Re: Elecraft Digest, Vol 9, Issue 5

Yes, I have experienced the temp reset. I don't believe it is that unusual. Roy Morris W4WFB ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): h

[Elecraft] LED Display on KAT100

G3RXQ, Stewart, apparently has the same problem with his KAT100 that I have. I have just learned that the erratic display on 30 meters is to be ignored. The tuner works fine and gets the SWR down to 1:1 on all bands. And yes, my tuner is well grounded. I have just learned to live with th

[Elecraft] KAT100 LED Configuratuin Jumpers

There are jumpers W1 through W6 that ground various pins of MCU U1 16F877 for LED control. W1 - W2: Both open = Auto. LED control; W1 = DOT; W2 = BAR and W3 - W6 Leave open except as required (see manual). This information is written on the KAT100 RF Board schematic Rev. A, dated 10-30-02

[Elecraft] SSB Low Output

I have found the best way to get additional gain from the KSB2 is to add the KSB2 INCREASED GAIN MOD by KI6WX as well as the other KI6WX KSB2 mods. These mods can be found on the Elecraft site. Be sure the mike input is biased correctly first. Roy Morris W4WFB _

[Elecraft] DSP on 60 Meters

When I tap DISPLAY and get "S1 nr nt" I hear a raspy tone ticking off the seconds. It is present in any DSP or time mode. It is loud enough to be annoying. This phenomenon only occurs on 60 meters. Has anyone else experienced this? Is it normal? Roy Morris W4WFB _

[Elecraft] KAT100 LEDs Gone Wild

I thought that installing MCU1.05 there would be ample RF sampling rates taken to avoid erratic LED displays. The updated firmware seems not to be the solution. With a 50 ohm dummy load on the KAT100 output only the leftmost LED lights up and K2 SWR is 1:1 regardless of power or band in use.

[Elecraft] K6XX Visible CW Tuning Indicator

Tom Hammond, N0SS, has done a really nice job with this kit. The SMT parts are encapsulated in a sealed plastic strip. The parts are removed from the strip in the order they are used. The board is well laid out and is of good quality. Tom says he only has about 15 kits ($17pp) remaining tha

[Elecraft] Recommended Switching Supply

This may be a bias on my part, but I remember the first switching supplies that came out. They were full of hash which gave them a bad name. Switchers are no doubt better now, but they still are capable of putting out hash (depending on your shack and antenna environment). I personally like t

[Elecraft] FS: K2/100 and TS850SAT

This is the second K2/100 I have built, and I am selling this one so I can build another. It is a very late serial number (42XX) with the following options installed: KSB2 SSB Option K160RX 160 Meter Option K60XV 60 Meter and XVTR Interface Option KNB2Noise Blanker KPA100 100 W. Amp

[Elecraft] Antenna Suspension

I am using a Carolina Windom 80 suspended with 3/16" nylon rope through stainless steel eyehooks up 50' between two large oak trees. These trees are approx 123 feet apart. Because I am located in hurricane alley and subject to high winds, I would like to remove the permanent tiedown on one of

[Elecraft] K2 ALC Anomaly Using PTT

I have installed the two resistors in the mod that Gary told me about, and the K2/100 ALC now works as it should. I am now going to do Gary's mod to my other K2/100 since it also has the KI6WX mods installed on the KSB2 board. Thanks again, Gary. Roy Morris W4WFB

[Elecraft] K2 ALC Anomaly Using PTT

the ALC anomaly is for real if the KI6WX PNA amp mod is installed on the KSB2 board. This was the case involving the three K2s with the ALC anomaly. Gary Surrency says that the added PNA that follows the U5 NE602 balanced modulator overdrives the standard ALC allowing up to 200W on voi

[Elecraft] K2 ALC Anomaly Using PTT

Anyone who uses a K2/100 with a linear needs to know that the K2 ALC does not kick in if PTT is used and the K2 display is in the RF mode. This can cause the input to the linear to be overdriven. This condition can also cause the K2 output not to be linear. It is necessary to put the K2 in AL

[Elecraft] K2 and KPA100 Observations

Has anyone experienced the ALC not kicking in when using the MH-2 mike on PTT. I have found If I put the display in ALC while using PTT, the ALC kicks in after about one word. ALC seems to kick in on VOX after a few words automatically without any coaxing or proding. Before ALC takes hold I

[Elecraft] FS: KAF2

FOR SALE: KAF2 with mounting hardware. This comes with three and five pin female headers and stand-off screw. Manual included. Capacitance in the Real Time Clock oscillator has been carefully selected for high time accuracy. $55 postpaid Cont US. If interested, please contact me direct. R

[Elecraft] FS: K2 Accessories

FT100 VFO Knob with rubber ring. Like new. $13 postpaid Cont US KAF2 Audio Filter and Real Time Clock with manual, standoff screw, 3 pin and 5 pin female headers for the Control Board. KAF2 works great and ready to install. $55 postpaid Cont US. If interested, contact me direct. Roy Morris

[Elecraft] Female Plugs for K2 Mike Header

I have wanted to use different mikes with my K2s, so I made up some plugs that fit the 16 pin mike header. I wanted to eliminate the 8 jumpers, and I also wanted to eliminate the 5.6K resistor at the back of the mike connector. Making up plugs for the Elecraft MH-2 and various Kenwood mikes i

[Elecraft] KSB2 Mod for Increased Mike Gain

Does anyone remember a mod where a 5.6K resistor replaces the 1K resistor at R14 on the KSB2 board for increased mike gain? I cannot find my notes on this mod. I thought it was a KI6WX mod, but I can't find it in John Grebenkemper's write-ups. Thanks. Roy Morris W4WFB _

[Elecraft] Firmware Upgrade

Within the last three or four months I upgraded all firmware chips for my 3 year old K2/100/KAT100-1 (so I could do the CW bandwidth mod and install the 60 meter board). I received version 1.08b for my KSB2. Since then I have purchased a new KSB2 that has version 1.09. What does the 1.09 supp

[Elecraft] tPA Change in KPA100

This happens to my KPA100 from time to time. Upon investigation the tpa value is always 255 and the problem is solved by resetting it to room temperature. I haven't been able to correlate this to any actual temperature changes as the temperature in my shack probably doesn't vary more than (+, -) 7

[Elecraft] K2 #4270 Now On The Air

Number 4270 (with KSB2, KNB2, K160RX, KAF2) now takes its place alongside 2225. Both doing fine and well! I will soon have builder's withdrawals and will have to add goodies to 4270. Eric and Wayne, yawl have me hooked on this K2 stuff!!! Roy Morris W4WFB __