Re: [Elecraft] [KX3] RS232 xcvr control when serial ports are occupied
I'm following up here with the verified solution to my issue. To recap - When I used a KXSER cable to connect my KXPA/KX3 to my Ciro Mazzoni Magloop antenna controller, that left no port available for me to control the KX3 with RS232 using the program FLRig. The best solution I found was to use a DB9 Y-connector in conjunction with a breakout board for the DB9 branch going to the antenna controller. On that board, I patched only the RXD and ground lines: pins 2 and 5, from input to output. With this configuration, the Antenna controller has its TXD pin left unconnected. As many here noted, this is of necessity since only one TXD driver can exist on a common TXD line. So, for the controller to work, FLRig must be running and connected to the radio. Since FLRig polls the KX3 control parameters, the Antenna controller receives the VFO data it needs on its RXD line. Apparently it doesn't matter that the controller is not doing the polling, as long as something else is. If I wanted to return polling autonomy to the antenna controller, I would have to disconnect the Y-junction. But I think I will keep things in place. Just because FLRig is running on the computer, doesn't mean that I can't use the KX3 standalone as I usually have in the past. So this is an acceptable solution. I'll probably post it on Ciro Mazzoni's user site for others' benefit. Thanks all for the help and pointers! 73, Steve, NU7B > On Jul 8, 2018, at 5:07 PM, Don Wilhelm wrote: > > Sorry about the pin typo. Look at the cable link for the steppIR that Dick > K6KR sent and that will be obvious. I was looking at that diagram when I > typed my response, but did not proof it. > TXD is really pin 3. > > 73, > Don W3FPR > > On 7/8/2018 7:24 PM, Stephen Rector wrote: >> Don: >> I tried a 3.5mm Y-connector at the KXPA and this did not work. But based on >> your feedback and also that of N6TV, I see that I have multiple TX drivers >> on the TXD line. Even if there is no TX from the antenna controller, the >> low-impedance of its TXD driver will load the line. Bob also thinks the >> controller may be polling for info, much like the program FLRIG does. One >> correction to your info Don, I think TXD is pin 3 on the DB-9, and not pin 2. >> The KXSER cable DB9 shell appears to be molded - it's not obvious how to >> disassemble it. So I will need to go into the controller to disconnect TXD >> there. I'll report back on whether or not that works, next weekend. >> 73, >> Steve, NU7B >>> On Jul 8, 2018, at 2:22 PM, Don Wilhelm wrote: >>> >>> Steve, >>> >>> Yes, since you are using both the KXUSB and the KXSER cables, a "Y" at the >>> KXPA100 would serve you well. >>> If your magloop controller also attempts to transmit, you can remove the >>> connection to pin 2 on the DE9 end of the KXSER cable (just remove the >>> backshell and disconnect the wire). >>> >>> RS-232 multiplexors are complicated devices and require the use of the full >>> RS-232 bus (mainly DTR and CTS signals) to handle the handshaking signals. >>> The 3 conductor KX3/KXPA100 wiring will not provide the proper handshaking >>> signals. >>> The handshaking signals are not provided from the data stream (as they are >>> in Ethernet and other communications protocols), but from the explicit >>> signals separate from TXD and RTS. >>> >>> Note that the KX3 (and most other Elecraft products) rely only on TXD and >>> RTS, which are reserved for data transmission only in the RS-232 scheme of >>> things. >>> >>> 73, >>> Don W3FPR >>> >>> On 7/8/2018 4:56 PM, Stephen Rector wrote: >>>> Hi Don: >>>> Yes - it occurred to me after sending the post that I might be able to >>>> create the split at the KXPA with a stereo Y-cable/connector. I am using a >>>> KXUSB to the computer, with a KXSER cable going from the the antenna >>>> controller to the KXPA. It is the KXUSB that presently has no place to >>>> connect to. >>>> So - I think I can try a 3.5mm stereo y-junction at the KXPA. Hopefully >>>> impedances won't be an issue at 38400 baud... >>>> I did look for RS232 multiplexers - they seem to exist for industrial >>>> applications. The documentation seemed to be sparse on the web. >>>> Anyway - thanks for the pointer :) >>>> 73, >>>> Steve NU7B >>>>> On Jul 8, 2018, at 1:37 PM, Don Wilhelm wrote: >>>>> >>>>> Steve, >>>>> >>>>> Are you using the KXUSB to connect with the
Re: [Elecraft] [KX3] RS232 xcvr control when serial ports are occupied
Don: I tried a 3.5mm Y-connector at the KXPA and this did not work. But based on your feedback and also that of N6TV, I see that I have multiple TX drivers on the TXD line. Even if there is no TX from the antenna controller, the low-impedance of its TXD driver will load the line. Bob also thinks the controller may be polling for info, much like the program FLRIG does. One correction to your info Don, I think TXD is pin 3 on the DB-9, and not pin 2. The KXSER cable DB9 shell appears to be molded - it's not obvious how to disassemble it. So I will need to go into the controller to disconnect TXD there. I'll report back on whether or not that works, next weekend. 73, Steve, NU7B > On Jul 8, 2018, at 2:22 PM, Don Wilhelm wrote: > > Steve, > > Yes, since you are using both the KXUSB and the KXSER cables, a "Y" at the > KXPA100 would serve you well. > If your magloop controller also attempts to transmit, you can remove the > connection to pin 2 on the DE9 end of the KXSER cable (just remove the > backshell and disconnect the wire). > > RS-232 multiplexors are complicated devices and require the use of the full > RS-232 bus (mainly DTR and CTS signals) to handle the handshaking signals. > The 3 conductor KX3/KXPA100 wiring will not provide the proper handshaking > signals. > The handshaking signals are not provided from the data stream (as they are in > Ethernet and other communications protocols), but from the explicit signals > separate from TXD and RTS. > > Note that the KX3 (and most other Elecraft products) rely only on TXD and > RTS, which are reserved for data transmission only in the RS-232 scheme of > things. > > 73, > Don W3FPR > > On 7/8/2018 4:56 PM, Stephen Rector wrote: >> Hi Don: >> Yes - it occurred to me after sending the post that I might be able to >> create the split at the KXPA with a stereo Y-cable/connector. I am using a >> KXUSB to the computer, with a KXSER cable going from the the antenna >> controller to the KXPA. It is the KXUSB that presently has no place to >> connect to. >> So - I think I can try a 3.5mm stereo y-junction at the KXPA. Hopefully >> impedances won't be an issue at 38400 baud... >> I did look for RS232 multiplexers - they seem to exist for industrial >> applications. The documentation seemed to be sparse on the web. >> Anyway - thanks for the pointer :) >> 73, >> Steve NU7B >>> On Jul 8, 2018, at 1:37 PM, Don Wilhelm wrote: >>> >>> Steve, >>> >>> Are you using the KXUSB to connect with the KXPA100/KX3, or are you using >>> the KXSER with a real computer serial port or a USB to serial adapter? >>> >>> Since your magloop controller only 'sniffs', it means it should only listen >>> and never try to transmit on the RS-232 signal lines. If it only listens, >>> there will be no collisons (RS-232 is not packet oriented, but an >>> asynchronous communications system). >>> >>> If the magloop controller also transmits on the RS-232 bus, you will need >>> some external device to act as "traffic cop" - note that RS-232 is a point >>> to point system (unlike Ethernet and others) where there is one driver >>> device and one receiver at each end. >>> >>> So yes, you can use a splitter - one with a 3.5mm stereo plug and two 3.5mm >>> stereo jacks if using the KXUSB. >>> If you are using the KXSER cable instead, yes, you can connect a "Y" DB9 >>> splitter to the DB9 end of the KXSER cable - the computer connects to one >>> side and the magloop controller connects to the other side of the "Y". >>> >>> On 7/8/2018 3:31 PM, Stephen Rector via Elecraft wrote: >>>> Hy home station is a KX3 + KPXA100, and I can control the radio via the >>>> RS232 port on the KXPA. However, recently I added a Ciro Mazzoni magloop >>>> to the station, and its controller plugs in to the KXPA serial port to >>>> sniff for frequency information, allowing re-tuning on the fly. This >>>> leaves no RS232 port left for remote control of the radio. >>>> How do I modify this arrangement to add an extra serial port for KX3 >>>> control? My first thought is that, since the antenna controller just >>>> sniffs for data, I could add a DB-9 Y-cable to provide the extra port at >>>> the controller serial port location. However, packets could still collide >>>> ...does the protocol handle this? Is there some sort of multiplexer >>>> available? __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [KX3] RS232 xcvr control when serial ports are occupied
Hi Dick: Thanks - the diagram makes things very clear. I initially didn't think of accomplishing the split at the KXPA 3.5mm connector, but it makes sense. Thanks, 73, Steve NU7B > On Jul 8, 2018, at 1:38 PM, d...@elecraft.com wrote: > > Typically "sniffers" don't have the TX side connected. RS-232 can't have > multiple transmitters on either wire. > > This is done with SteppIR controller, for similar reasons. SteppIR > describes a splitter cable for DE-9 connectors. The same principle (with a > much simpler cable, just tip and ring) applies to the 3.5mm connector to the > KXPA100. > > http://www.steppir.com/wp-content/uploads/2011/10/Y-Cable.pdf > > 73 de Dick, K6KR > > > -Original Message- > From: elecraft-boun...@mailman.qth.net On > Behalf Of Stephen Rector via Elecraft > Sent: Sunday, July 8, 2018 12:31 > To: elecraft@mailman.qth.net > Subject: [Elecraft] [KX3] RS232 xcvr control when serial ports are occupied > > Hy home station is a KX3 + KPXA100, and I can control the radio via the > RS232 port on the KXPA. However, recently I added a Ciro Mazzoni magloop to > the station, and its controller plugs in to the KXPA serial port to sniff > for frequency information, allowing re-tuning on the fly. This leaves no > RS232 port left for remote control of the radio. > > How do I modify this arrangement to add an extra serial port for KX3 > control? My first thought is that, since the antenna controller just sniffs > for data, I could add a DB-9 Y-cable to provide the extra port at the > controller serial port location. However, packets could still collide > ...does the protocol handle this? Is there some sort of multiplexer > available? > > Thanks, > > Steve > > NU7B > __ > 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 hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to d...@elecraft.com > __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [KX3] RS232 xcvr control when serial ports are occupied
Hi Don: Yes - it occurred to me after sending the post that I might be able to create the split at the KXPA with a stereo Y-cable/connector. I am using a KXUSB to the computer, with a KXSER cable going from the the antenna controller to the KXPA. It is the KXUSB that presently has no place to connect to. So - I think I can try a 3.5mm stereo y-junction at the KXPA. Hopefully impedances won't be an issue at 38400 baud... I did look for RS232 multiplexers - they seem to exist for industrial applications. The documentation seemed to be sparse on the web. Anyway - thanks for the pointer :) 73, Steve NU7B > On Jul 8, 2018, at 1:37 PM, Don Wilhelm wrote: > > Steve, > > Are you using the KXUSB to connect with the KXPA100/KX3, or are you using the > KXSER with a real computer serial port or a USB to serial adapter? > > Since your magloop controller only 'sniffs', it means it should only listen > and never try to transmit on the RS-232 signal lines. If it only listens, > there will be no collisons (RS-232 is not packet oriented, but an > asynchronous communications system). > > If the magloop controller also transmits on the RS-232 bus, you will need > some external device to act as "traffic cop" - note that RS-232 is a point to > point system (unlike Ethernet and others) where there is one driver device > and one receiver at each end. > > So yes, you can use a splitter - one with a 3.5mm stereo plug and two 3.5mm > stereo jacks if using the KXUSB. > If you are using the KXSER cable instead, yes, you can connect a "Y" DB9 > splitter to the DB9 end of the KXSER cable - the computer connects to one > side and the magloop controller connects to the other side of the "Y". > > On 7/8/2018 3:31 PM, Stephen Rector via Elecraft wrote: >> Hy home station is a KX3 + KPXA100, and I can control the radio via the >> RS232 port on the KXPA. However, recently I added a Ciro Mazzoni magloop to >> the station, and its controller plugs in to the KXPA serial port to sniff >> for frequency information, allowing re-tuning on the fly. This leaves no >> RS232 port left for remote control of the radio. >> How do I modify this arrangement to add an extra serial port for KX3 >> control? My first thought is that, since the antenna controller just sniffs >> for data, I could add a DB-9 Y-cable to provide the extra port at the >> controller serial port location. However, packets could still collide >> ...does the protocol handle this? Is there some sort of multiplexer >> available? __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] [KX3] RS232 xcvr control when serial ports are occupied
Hy home station is a KX3 + KPXA100, and I can control the radio via the RS232 port on the KXPA. However, recently I added a Ciro Mazzoni magloop to the station, and its controller plugs in to the KXPA serial port to sniff for frequency information, allowing re-tuning on the fly. This leaves no RS232 port left for remote control of the radio. How do I modify this arrangement to add an extra serial port for KX3 control? My first thought is that, since the antenna controller just sniffs for data, I could add a DB-9 Y-cable to provide the extra port at the controller serial port location. However, packets could still collide ...does the protocol handle this? Is there some sort of multiplexer available? Thanks, Steve NU7B __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KX3 #1690 observations
Hi All: I received my KX3 s/n 1690 about 10 days ago and have been putting it to work on many modes. It's got best receiver I've ever used, although the highest end xcvr I've owned previous to it was a TS850 with narrow filters - not quite high-end compared to the $5K radios on today's market. But I expected it to be good given Elecrafts work on the K3 - and I have been very pleased so far. I can see two areas where a tweak might be beneficial. With weak signals or QRN, I spend a lot of time using a CW passband of 150 or 100 Hz. It would be nice if the PBW control switched from 50 Hz steps to 10 or 20 Hz increments below 150-200 Hz - these would allow a finer adjust on close-in interferers while minimizing the need to go to 50 Hz passband with its higher PB center attenuation. The other area is maybe unique to HF digital mode operators. Since I'm QRP with the KX3, I use Olivia because of it's advantage as a weak-signal mode. With the KX3, I find that during a 3-5 minute transmission, the PA starts its HI-TEMP foldback at anything above the 3.0W setting. For this mode, the modest heatsink on the KX3 is insufficient - the plate is not terribly well thermally coupled to the devices - nor does it have much thermal mass. I could make something ugly with a piece of 3/16 in copper stock that I have using a 4-40 tap for threads - but I wonder if Elecraft could offer a heatsink upgrade for data mode users. I haven't tried heat sink compound on the FETs, but I still thing the heatsink could benefit from more thermal mass. Backpackers may not want the extra few ounces - so an option approach might work best. I wonder how other data users deal with this - a muffin fan would help I imagine. In summary, I am 90% delighted with the KX3. I cant wait for the amplifier to be announced - I really need the boots in my deed-restricted neighborhood. Is there a general timeframe this is expected to be announced / orders taken? I'd rather not get the Tentec 418 because the integration to the KX3 won't be as good and there's no internal tuner. Did manage to get NH8S on two bands QRP though... Steve, NU7B KX3 #1690 K2 #6770 / KPA100 / KAT100 / KSB2 etc. __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Devices for upcoming KX3 PA
I've got a KX3 on order, with the idea of replacing my K2-100 as the primary radio at home. So, the PA is something I'll be watching for. I wonder what Wayne and others think about using push-pull mosfet finals as opposed to the BJT used in the K2-100 PA. Mosfets are almost universally used in PA designs with Vcc 24V, and have become common at 12V. I haven't recently designed a PA, but I assume there is some advantage in 3rd-order IM with devices that are roughly square-law, although this may be offset by greater difficulty in the match to the device. I assume the KX3 PA will have 12V Vcc. Steve NU7B __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 modification of the variable BW Cohn CW crystal filter
I ve been using me K2 (s/n 6770) in the digital modes lately and have wanted to make an improvement in the passband ripple, which is almost 10 dB p-p when the BW is set at 2 KHz, with the RX audio viewed spectrally. So I simulated the filter using the crystal parameters given here: http://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_2009/QEX_Nov-Dec_09_Feature.pdf , using the spice simulator Qucs at http://qucs.sourceforge.net . The simulation agrees with the measured passband when I set the termination impedances between 200-300 ohms, with the ripple being more pronounced as the impedance is lowered. I found a reference on the web to a modification of the Cohn filter which preserves the equal capacitances and crystal parameters for all elements, documented by G3UUR and described (page 5) here: http://www.warc.org.uk/filestore/projects/xtal_bpf_203/eDishalHelp.pdf . I haven't gone into the mathematics of this alteration, but the effect of placing a crystal in parallel with X7 and X11 is a de-Q-ing of these two elements and substantial reduction of ripple at the passband edges. This effect is apparently not unknown to Wayne, who uses it in the BFO resonator and considered it for increasing the pullability of the PLL reference. I don't have the 2010 ARRL Handbook, but G3UUR has an article in it describing his modification of the Cohn ladder response. So - the mod I tried in simulation was to place a crystal in parallel with X7 and X11, and to replace the coupling varicaps D29 and D34 with 4700pF fixed caps. The varicaps D30-33 are untouched. My simulation results: K2 design: With Cvc = 44pF: 6dB BW = 2.07 KHz, 60 dB BW = 4.55 KHz, ripple = 9 dB p-p, shape factor = 2.2. With Cvc = 200 pF: 6dB BW = 0.57 KHz, 60 dB BW = 1.52 KHz, ripple = 1.5 dB p-p, shape factor = 2.67. Modified K2 design, G3UUR topology: With Cvc = 56pF: 6dB BW = 2.03 KHz, 60 dB BW = 5.31 KHz, ripple = 3 dB p-p, shape factor = 2.61. With Cvc = 205 pF: 6dB BW = 0.57 KHz, 60 dB BW = 1.96 KHz, ripple = 0.5 dB p-p, shape factor = 3.50. So it looks like I get a substantial reduction in passband ripple and a flatter group delay with the modification, at the cost of a bit of increase in the shape factor. If I used the K2 strictly for CW or psk31, I might not want to make a change. But I use wider digital modes like Olivia where group delay distortion can make a difference in BER. So I think I'm going to try the mod. Don has suggested in the past to narrow down the passband when using the digital modes, but this makes enough of a difference above 1 KHz BW (and I see surrounding signals in the waterfall), that this mod is worth a try. I'm curious if anyone on the list has considered it. Steve NU7B __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] MH2 Mic issue
Hi All: I'm new to this list. As of last week, my K2 s/n 6770 is up and running - I'm quite happy with it. Even though I have a stealth sloper to a pine tree (HOA restriction), the receiver has impressed me, and the QRP gets out (next weekend's board is the 100W PA). This weekend I got three of the accessory boards installed pretty much without a hitch, except for a problem with the MH2 hand mic. The KSSB2 board seems fully functional and I get good reports on transmit audio when I use a Heil HM-10 with the K2. But when I plug in the new MH2 hand mic, the T/R keys but with zero audio: no ALC indication and no RF. Is there a measurement I can make on the MH2 before sending it back? (I wired in the 5.6K resistor from pins 2-6 per the instructions) Steve NU7B __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K2 CAL_FIL and the BFO
I'm new to the list, with a couple of questions on the K2. My s/n 6770 has been running for about a week: this weekend put in the KSSB2, KDSP2 and KNB2. When I select from the four CW xtal filter bandwidths, I get a slightly different pitch on the received CW station. Qusetion 1: Is that pitch change directly due to the offset I have dialed in during the filter calibration? The circuit changes the bandwidth of the Cohn crystal filter and, at the same time, I dial in an offset to center that new passband to my desired pitch. So, I'm confused why the pitch changes - maybe it's just calibration error because the tuning step is coarser than my ear. Question 2 is an observation: CW mode is LSB all the way to 17 meters, then USB from 15M up. This is normal, right? On previous (upconverting) radios it's always been USB from 20M up, so this surprised me. Thanks for any help with these... 73, Steve NU7B __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2 CAL_FIL and the BFO
Hi Don: I will check your article out, and thanks again. Last I checked today, the pitch change was slight, so I'll keep an ear on it. And I'll try Spectrogram at some point, after the construction is done. Still have the PA and KAT-100 to go It's nice to have the knowledge base that you and others are willing to share. Cheers, Steve On Jul 26, 2009, at 5:16 PM, Don Wilhelm wrote: Steve, There may be a slight change in the pitch of the received signal when changing filters, but it should be limited to 20 Hz or less. If it is more than that, you will have to do a good filter alignment. I recommemd using Spectrogram and a noise generator so you can see what you are doing, but lacking the wideband noise generator, the same thing can be accomplished with band noise. See my website www.w3fpr.com article on K2 Dial Calibration for more information. Part 3 of that article deals with aligning the filters (adjust the BFO frequency to shift the passband), and has links to help setting up and using Spectrogram. Even though the latest version of Spectrogram is now freeware, I recommend you use version 5.17 (download from Tom Hammond's website www.n0ss.net) because the 'how-to' information is written for that version - the screenshots may differ for other versions (but are similar). Yes, the K2 places the VCO on the high frequency side of the signal frequency for bands up through 17 meters, but at 15 meters and above, the VFO is on the low side - that is what causes the sideband inversion. If you prefer to listen to CW in LSB for all the bands, then switch to CW reverse for 15, 12 and 10 meters. Stephen Rector wrote: I'm new to the list, with a couple of questions on the K2. My s/n 6770 has been running for about a week: this weekend put in the KSSB2, KDSP2 and KNB2. When I select from the four CW xtal filter bandwidths, I get a slightly different pitch on the received CW station. Qusetion 1: Is that pitch change directly due to the offset I have dialed in during the filter calibration? The circuit changes the bandwidth of the Cohn crystal filter and, at the same time, I dial in an offset to center that new passband to my desired pitch. So, I'm confused why the pitch changes - maybe it's just calibration error because the tuning step is coarser than my ear. Question 2 is an observation: CW mode is LSB all the way to 17 meters, then USB from 15M up. This is normal, right? On previous (upconverting) radios it's always been USB from 20M up, so this surprised me. Thanks for any help with these... 73, Steve NU7B __ __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Fwd: MH2 Mic issue
Begin forwarded message: From: Stephen Rector azstef...@mac.com Date: July 26, 2009 5:26:51 PM GMT-07:00 To: d...@w3fpr.com Subject: Re: [Elecraft] MH2 Mic issue Message-Id: 32086425-1687-4f48-8559-b91c3895b...@mac.com In-Reply-To: 4a6cee8d.2070...@w3fpr.com Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes X-Smtp-Server: smtp.mac.com:azstefano Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v935.3) References: c4b523e9-4d50-484c-97c9-0586bbae3...@mac.com 4a6ce6f0.7050...@embarqmail.com 321a9bcf-9ede-42b6-b4b3-09c9fe59a...@mac.com 4a6cee8d.2070...@w3fpr.com Hi Don: I did it the more painful way - pulling out the front now means removing the DSP boards... I'll remember the side panel suggestion... Anyway - problem solved, and the HM-10 doesn't mind the DC on the AF line, so both mics are working. Thanks for that almost instant help. Nice to see such an active list. I've been inactive ham for almost 10 years, but now hv excuse to spend some more time on the air as the next sunspot cycle builds steam. Thanks, Steve NU7B On Jul 26, 2009, at 5:02 PM, Don Wilhelm wrote: Steve, You can get access to the back of the mic jack by removing the left side panel - enough clearance to change the end of the resistor from pin 2 to pin 1. 73, Don W3FPR Stephen Rector wrote: Oy - that would explain it. I'll check that right now. maybe a cerebral typo Tnx, Steve On Jul 26, 2009, at 4:29 PM, Don Wilhelm wrote: Steve, Re-check those instructions for the MH2. The resistor goes between pins 1 and 6. Pin 1 is the AF line, and pin 6 is the 5 volt line. You must pipe voltage to the AF line on the mike (through the resistor) to make it produce audio. BTW, pin 2 is the PTT pin. 73, Don W3FPR Stephen Rector wrote: Hi All: I'm new to this list. As of last week, my K2 s/n 6770 is up and running - I'm quite happy with it. Even though I have a stealth sloper to a pine tree (HOA restriction), the receiver has impressed me, and the QRP gets out (next weekend's board is the 100W PA). This weekend I got three of the accessory boards installed pretty much without a hitch, except for a problem with the MH2 hand mic. The KSSB2 board seems fully functional and I get good reports on transmit audio when I use a Heil HM-10 with the K2. But when I plug in the new MH2 hand mic, the T/R keys but with zero audio: no ALC indication and no RF. Is there a measurement I can make on the MH2 before sending it back? (I wired in the 5.6K resistor from pins 2-6 per the instructions) Steve NU7B __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/ donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.31/2264 - Release Date: 07/26/09 11:07:00 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: 270.13.31/2264 - Release Date: 07/26/09 11:07:00 __ 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 hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
