K3 in NAQP SSB
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Both K3s played very well during the NAQP SSB this weekend (675 Qs, 120
Mults, 8 hours). I don't normally play in the SSB tests, but I had to miss the NAQP CW and just needed a radio fix. On 20M, the DSP (with 2.8khz filter) filtering really helped. I played with the high and low passband occasionally to keep things clean. When it got really tough, I moved to the 2.1 khz filter. On 40, 80 and 160 I was able to dig out the weak ones pretty well even with rain and thunder static nearby. I had to shut down for a while when the rain static got so bad on the 20M beam that I could not copy anything. I was not able to find a NR or NB setting to fix that. Unfortunately, I was not able to go full SO2R with my new microHAM MK2R SO2R box and N1MM DVK because of RF feedback getting into the audio lines. I had the same problem with my DXdoubler, so I know it is not the microHAM box, but something in my setup is causing a hollow echo distortion effect in my headphones even though it is not too bad on the air according to reports. When I plug the headset directly into the K3, no problems at all. I've got to figure this problem out so I can use all this fancy gear. ;-) I wish Elecraft would invent and sell a foolproof anti-RF faraday shield cage to mount each component in because this problem is driving me nuts in SO2R mode. 73, Bob K5WA _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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On Mon, 18 Aug 2008 11:27:17 -0500, Bob Evans wrote:
>Unfortunately, I was not able to go full SO2R with my new microHAM MK2R SO2R >box and N1MM DVK because of RF feedback getting into the audio lines. I had >the same problem with my DXdoubler, so I know it is not the microHAM box, Don't be so sure of that. MOST ham rigs and ham accessory boxes are built with pin 1 problems, which are the primary cause of RFI. While I have not TESTED any of the accessory boxes, I have studied the construction of several of them, and they sure look like they're built with classic pin 1 problems. For this reason, I don't use these boxes. Instead, I use the simple interfaces shown in http://audiosystemsgroup.com/HamInterfacing.pdf To gain a better understandinhg of RFI and "the pin 1 problem," see http://audiosystemsgroup.com/RFI-Ham.pdf My K3 drives a Ten Tec Titan 425 to the legal limit into coax-fed dipoles that are roughly 100 ft directly overhead, and to a 160M vertical roughly 25 ft from the operating bench. Every antenna has a good common mode choke at the feedpoint. I have never seen an RFI problem with my K3. I DID have RFI problems with my FT1000MPs in the same setup, which I had to kill with common mode chokes on the mic cables. For NAQP SSB, I used my T22 Thinkpad in N1MM's #2 audio setup as shown on pages 58 of the Ham Interfacing pdf to drive two MPs left and right. (My K3 is in Aptos for repair, but the setup worked fine with one MP and the K3 before the XMIT died). NAQP, of course, is a 100W contest, so the amp was off. 73, Jim Brown K9YC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by K5WA
On Mon, 18 Aug 2008 14:11:05 -0400, hank k8dd wrote:
>Wow, Jim, how did you get your K3 back to them so fast? My neighbor works there, and he dropped it off for me. There IS a queue, so I don't expect to have it back real soon. 73, Jim K9YC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Jim Brown-10
>>Unfortunately, I was not able to go full SO2R with my new microHAM MK2R
>>SO2R >>box and N1MM DVK because of RF feedback getting into the audio lines. I >>had >>the same problem with my DXdoubler, so I know it is not the microHAM box, > > Don't be so sure of that. MOST ham rigs and ham accessory boxes are built > with pin 1 problems, which are the primary cause of RFI. Be especially aware that rigs with external 12V supplies can develop what sounds exactly like RFI from "pin 1" problems. This is because the power supply leads of the SSB radio are current modulated at an audio rate. If the 12V supply has a ground connection common to the negative lead post on the supply (or through other gear) the V- lead voltage drop can cause a "pin 1" issue from dc potential that varies at an audio rate. As Jim says this is a common problem and might not actually be RF feedback. We've had that problem here on several contesting accessories. I'm disappointed to have to say most popular interface equipment has that problem. 73 Tom _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by K5WA
Thanks Lee. What you've described is a classic example of a "pin 1 problem,"
and your solution was a good one. That is, you gave the cable shield a good RF path to the chassis and removed the path to the circuit board. The cap from the hot to ground MAY have mattered, but I'd guess a lot less than you think. 73, Jim K9YC On Mon, 18 Aug 2008 12:03:29 -0700, Lee Sawkins wrote: >Hi Bob. >I am not subscribed to the list, so I cannot post there. >I had exactly the same problem as you with my DX Doubler. Going through >the box, RF feedback. Going direct, no feedback. >The main difference between these two methods of connecting the mike was >that the DX Doubler had small capacitors to its circuit board from both >the mike hot and ground lines. I clipped one lead of each cap on the >top of the circuit board to remove them from these lines. I only >clipped one lead in case I wanted to re-install them. This cleared up >almost all of the problem. A small capacitor (.001) across the mike and >ground lines at the connector of the K3 completely elimated the problem, >even when running a TL922 amp with my K3. >The problem appears to be that the small bypass caps inside the DX >Doubler are coupling RF "into" the mike leads rather than getting it >out! >73 Lee VE7CC >>Unfortunately, I was not able to go full SO2R with my new microHAM MK2R SO2R >>box and N1MM DVK because of RF feedback getting into the audio lines. I had >>the same problem with my DXdoubler, so I know it is not the microHAM box, >>but something in my setup is causing a hollow echo distortion effect in my >>headphones even though it is not too bad on the air according to reports. >>When I plug the headset directly into the K3, no problems at all. I've >>got to figure this problem out so I can use all this fancy gear. ;-) >No virus found in this incoming message. >Checked by AVG - http://www.avg.com >Version: 8.0.138 / Virus Database: 270.6.5/1618 - Release Date: 8/18/2008 6:51 AM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by W8JI
On Mon, 18 Aug 2008 15:35:55 -0400, W8JI Tom wrote:
>If the 12V supply has a ground connection common >to the negative lead post on the supply (or through other gear) the V- lead >voltage drop can cause a "pin 1" issue from dc potential that varies at an >audio rate. YES! There's a similar problem on a lot of professional mix consoles, especially big ones with outboard power supplies. It shows up there in the form of hum/buzz issues. When we wrote AES48, we forgot about that mechanism, and didn't include it in the tutorial appendix. We'll probably add it when the Standard comes up for renewal in 2010. BTW -- several of us (including Joe Subich) have measured a significant DC voltage between connectors at the front and rear of the K3. This has the potential for doing exactly what you describe, depending on where that voltage appears in the circuitry! I built mine from the boards, and I took great pains to carefully install all the lockwashers and tighten all the screws. 73, Jim K9YC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by W8JI
Tom writes: > Be especially aware that rigs with external 12V supplies can > develop what sounds exactly like RFI from "pin 1" problems. > > This is because the power supply leads of the SSB radio are > current modulated at an audio rate. If the 12V supply has a > ground connection common to the negative lead post on the > supply (or through other gear) the V- lead voltage drop can > cause a "pin 1" issue from dc potential that varies at an > audio rate. This is a particular problem with transceivers that have a single V- lead and only one "pin" for the V- connection (like the K3). If the negative lead connection is not absolutely perfect other "ground" paths (e.g. the shield on a microphone cable) through accessory equipment will carry a portion of the return current. If the accessory device has an active output, a change of only a few millivolts in ground potential sue to the ground currents will directly modulate the transceiver's mic input. With typical microphone levels of less than 10 millivolts, even one millivolt of "current modulation" can appear to as a significant "RF feedback." The same issue can appear with CAT ports. Where the common (signal ground) of the CAT port includes excess impedance, the signal WILL seek a lower impedance return. With RS-232, the driving signal is 20 to 30 V P-P (+/-10 to 15 V) ... when Pin 5 of a RS-232 port (or signal ground of a TTL input) includes several ohms of DC resistance, there is a significant chance that the data signal will couple into sensitive microphone circuits. 73, ... Joe, W4TV _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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> This is a particular problem with transceivers that have a
> single V- lead and only one "pin" for the V- connection > (like > the K3). If the negative lead connection is not > absolutely > perfect other "ground" paths (e.g. the shield on a > microphone > cable) through accessory equipment will carry a portion of > the > return current. It is nearly impossible to cure this with any rig with an external 12V supply unless you isolate the radio power supply negative terminal from ground, or float all the audio line grounds except at the radio. I first discovered this problem with an IC-751A ICOM, which was my first 12 V operated radio. My FT1000MP was no better, so this is definitely not a "K3-only" issue. There isn't a 12V radio out there that will not have this problem aside from some isolated ground Motorola two-way radios and things that will run off 12V positive ground systems. I use a separate 12V supply for any 12V radio, and a smaller supply for accessories, for two reasons: 1.) If you use a common supply and the supply positive lead ever gets shorted to ground or the negative ever opens it can blow up foil traces in small accessories like keyers. 2.) If an accessory device gets a short it can melt wires or open foil in other devices. I use a low current thermally resetting fuses for accessories and a different heavy supply with an isolated ground lead for any 12V radio, and I use isolation transformers when necessary on audio lines. It's just silly to design an audio interface device that commons the shield of audio lines to multiple pieces of gear or to the cabinet, but that is how Ham accessories are usually made. 73 Tom _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Joe Subich, W4TV-3
The obvious solution is just to use the K3 +12VDC output connector for
all accessories. It's rated for 0.5A which should be plenty for most devices. As a bonus it's controlled by the K3 ON/OFF switch. Al N1AL On Mon, 2008-08-18 at 16:47, Joe Subich, W4TV wrote: > Tom writes: > > > Be especially aware that rigs with external 12V supplies can > > develop what sounds exactly like RFI from "pin 1" problems. > > > > This is because the power supply leads of the SSB radio are > > current modulated at an audio rate. If the 12V supply has a > > ground connection common to the negative lead post on the > > supply (or through other gear) the V- lead voltage drop can > > cause a "pin 1" issue from dc potential that varies at an > > audio rate. > > This is a particular problem with transceivers that have a > single V- lead and only one "pin" for the V- connection (like > the K3). ... _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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A feature that would be nice to have on the K3, is for the radio to remember to come back on without pushing the ON/OFF switch on the transceiver when the power was shut off at the power supply end. This is a feature that has been available on a lot of the commercial land mobile radios for years.
Thanks from Fern VE7GZ with K3 #412 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Alan Bloom
Alan writes: > The obvious solution is just to use the K3 +12VDC output > connector for all accessories. It's rated for 0.5A which > should be plenty for most devices. As a bonus it's > controlled by the K3 ON/OFF switch. Unfortunately it's not that easy. The +12VDC "output" is not +12V - it's somewhat less. There are two series diodes, one in the +13.8V input and one on the +12V output plus the FET power switch that adds a variable voltage drop that depends primarily on the current drawn by the driver. In transmit the +12V output is often as low as +11.8V (or less if the primary supply is lower than 13.8V). If the accessory is designed with a series diode to protective against reverse voltage at the input, the supply voltage can be too low for reliable operation of 12V DC relays. Eliminating D34 in the K3 would be a big help with the low output voltage. 73, ... Joe, W4TV > On Mon, 2008-08-18 at 16:47, Joe Subich, W4TV wrote: > > Tom writes: > > > > > Be especially aware that rigs with external 12V supplies can > > > develop what sounds exactly like RFI from "pin 1" problems. > > > > > > This is because the power supply leads of the SSB radio are > > > current modulated at an audio rate. If the 12V supply has a > > > ground connection common to the negative lead post on the > > > supply (or through other gear) the V- lead voltage drop can > > > cause a "pin 1" issue from dc potential that varies at an > > > audio rate. > > > > This is a particular problem with transceivers that have a > > single V- lead and only one "pin" for the V- connection (like > > the K3). ... > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by W8JI
Tom writes: > It's just silly to design an audio interface device that > commons the shield of audio lines to multiple pieces of gear > or to the cabinet, but that is how Ham accessories are > usually made. The transceiver manufacturers generally force that design by using unbalanced audio input/output and tying the cold side to the chassis. The solution would be to use balanced and shielded inputs and outputs. In addition to eliminating the "sneak" path for power supply currents, balanced inputs would provide significant additional immunity against common mode noise and RF. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Joe Subich, W4TV-3
Or replace the series diodes with power schottkys.
On Mon, 2008-08-18 at 21:29, Joe Subich, W4TV wrote: > > Alan writes: > > > The obvious solution is just to use the K3 +12VDC output > > connector for all accessories. It's rated for 0.5A which > > should be plenty for most devices. As a bonus it's > > controlled by the K3 ON/OFF switch. > > Unfortunately it's not that easy. The +12VDC "output" is > not +12V - it's somewhat less. There are two series diodes, > one in the +13.8V input and one on the +12V output plus the > FET power switch that adds a variable voltage drop that > depends primarily on the current drawn by the driver. > > In transmit the +12V output is often as low as +11.8V (or > less if the primary supply is lower than 13.8V). If the > accessory is designed with a series diode to protective > against reverse voltage at the input, the supply voltage > can be too low for reliable operation of 12V DC relays. > Eliminating D34 in the K3 would be a big help with the low > output voltage. > > 73, > > ... Joe, W4TV > > > > > > On Mon, 2008-08-18 at 16:47, Joe Subich, W4TV wrote: > > > Tom writes: > > > > > > > Be especially aware that rigs with external 12V supplies can > > > > develop what sounds exactly like RFI from "pin 1" problems. > > > > > > > > This is because the power supply leads of the SSB radio are > > > > current modulated at an audio rate. If the 12V supply has a > > > > ground connection common to the negative lead post on the > > > > supply (or through other gear) the V- lead voltage drop can > > > > cause a "pin 1" issue from dc potential that varies at an > > > > audio rate. > > > > > > This is a particular problem with transceivers that have a > > > single V- lead and only one "pin" for the V- connection (like > > > the K3). ... > > > > _______________________________________________ > > Elecraft mailing list > > Post to: [hidden email] > > You must be a subscriber to post to the list. > > Subscriber Info (Addr. Change, sub, unsub etc.): > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > Help: http://mailman.qth.net/subscribers.htm > > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Alan Bloom
> The obvious solution is just to use the K3 +12VDC output > connector for > all accessories. It's rated for 0.5A which should be > plenty for most > devices. As a bonus it's controlled by the K3 ON/OFF > switch. That by itself doesn't cure ground loops and it doesn't cure the negative lead damage problems if the power supply has a ground path other than exclusively through the negative lead to the rig, so the negative of the supply still must float from ground everywhere except at the rig. The audio line grounds still need isolated too if they run between gear that is connected to power lines, like computers and such. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Fern Rivard
My first thought on the matter is to agree with Fern,
but after thinking about it for a while, pressing the POWER button is not so hard and it will allow the K3 to turn itself off on low voltage and protect your battery for battery operations. I have come to think of this as a good feature even though I am not set up for battery operation at this time. It will also let you know right away if you have a loose power connection or a defective power supply. I vote to keep the K3 like it is. Cookie, K5EWJ --- Fern Rivard <[hidden email]> wrote: > A feature that would be nice to have on the K3, > is for the radio to remember to come back on without > pushing the ON/OFF switch on the transceiver when > the power was shut off at the power supply end. This > is a feature that has been available on a lot of the > commercial land mobile radios for years. > Thanks from Fern VE7GZ with K3 #412 > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Willis 'Cookie' Cooke K5EWJ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Hi Cookie:
I run my K3 on a switching ps but the way it is set up now, this means that one that to first turn the ps on and then the K3 on. A lot of the commercial land mobile radios have an option to set the mobile so that as soon as it sees power from the ignition switch, the radio turns on so the operator doesn't forget to turn it on. It's an excellent feature and has been around for many years. Fern ----- Original Message ----- From: "WILLIS COOKE" <[hidden email]> To: "Fern Rivard" <[hidden email]>; "Elecraft Reflector" <[hidden email]> Sent: Tuesday, August 19, 2008 11:03 AM Subject: Re: [Elecraft] re ON-OFF on K3 My first thought on the matter is to agree with Fern, but after thinking about it for a while, pressing the POWER button is not so hard and it will allow the K3 to turn itself off on low voltage and protect your battery for battery operations. I have come to think of this as a good feature even though I am not set up for battery operation at this time. It will also let you know right away if you have a loose power connection or a defective power supply. I vote to keep the K3 like it is. Cookie, K5EWJ --- Fern Rivard <[hidden email]> wrote: > A feature that would be nice to have on the K3, > is for the radio to remember to come back on without > pushing the ON/OFF switch on the transceiver when > the power was shut off at the power supply end. This > is a feature that has been available on a lot of the > commercial land mobile radios for years. > Thanks from Fern VE7GZ with K3 #412 > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Willis 'Cookie' Cooke K5EWJ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 270.6.5/1620 - Release Date: 8/19/2008 6:04 AM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I understand Fern. I use a switching power supply as
well, but someday I might want to use a battery. I have a TS-850SAT here on my operating desk which works as you describe. When I turn on my supply, the TS-850SAT also turns on if it was turned on before, but the K3 does not. At first I agreed with you, but after using the two rigs and thinking about it I decided that I prefer the way the K3 works. Your mileage may vary, but there is advantage to both sides of the choice. Cookie, K5EWJ --- Fern Rivard <[hidden email]> wrote: > Hi Cookie: > > I run my K3 on a switching ps but the way it is > set up now, this means that one that to first turn > the ps on and then the K3 on. A lot of the > commercial land mobile radios have an option to set > the mobile so that as soon as it sees power from the > ignition switch, the radio turns on so the operator > doesn't forget to turn it on. It's an excellent > feature and has been around for many years. > Fern > > > ----- Original Message ----- > From: "WILLIS COOKE" <[hidden email]> > To: "Fern Rivard" <[hidden email]>; "Elecraft > Reflector" <[hidden email]> > Sent: Tuesday, August 19, 2008 11:03 AM > Subject: Re: [Elecraft] re ON-OFF on K3 > > > My first thought on the matter is to agree with > Fern, > but after thinking about it for a while, pressing > the > POWER button is not so hard and it will allow the K3 > to turn itself off on low voltage and protect your > battery for battery operations. I have come to > think > of this as a good feature even though I am not set > up > for battery operation at this time. It will also > let > you know right away if you have a loose power > connection or a defective power supply. I vote to > keep the K3 like it is. > > Cookie, K5EWJ > > --- Fern Rivard <[hidden email]> wrote: > > > A feature that would be nice to have on the > K3, > > is for the radio to remember to come back on > without > > pushing the ON/OFF switch on the transceiver when > > the power was shut off at the power supply end. > This > > is a feature that has been available on a lot of > the > > commercial land mobile radios for years. > > Thanks from Fern VE7GZ with K3 #412 > > _______________________________________________ > > Elecraft mailing list > > Post to: [hidden email] > > You must be a subscriber to post to the list. > > Subscriber Info (Addr. Change, sub, unsub etc.): > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > Help: http://mailman.qth.net/subscribers.htm > > Elecraft web page: http://www.elecraft.com > > > > > Willis 'Cookie' Cooke > K5EWJ > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 270.6.5/1620 - > Release Date: 8/19/2008 6:04 AM > > > Willis 'Cookie' Cooke K5EWJ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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The need to manually press the power button to turn on the radio is a
problem in remote-controlled stations. If power fails, one must visit the site to power up the radios. That said, there are often many transients when power is first restored. An ideal solution would have these attributes: -- if the radio was powered up when the +13 Vdc supply voltage disappeared, then... -- when +13 Vdc reappears, wait 3 seconds, and then power-up the radio. 73, -- Eric K3NA _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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G'day,
My handbook (p18) gives details on how to turn the K3 on and off by remote control. Regards, Mike VP8NO ----- Original Message ----- From: "Eric Scace K3NA" <[hidden email]> To: "WILLIS COOKE" <[hidden email]> Cc: "Elecraft Reflector" <[hidden email]> Sent: Wednesday, August 20, 2008 9:02 AM Subject: Re: [Elecraft] re ON-OFF on K3 | The need to manually press the power button to turn on the radio is a | problem in remote-controlled stations. If power fails, one must visit | the site to power up the radios. | | That said, there are often many transients when power is first restored. | | An ideal solution would have these attributes: | -- if the radio was powered up when the +13 Vdc supply voltage | disappeared, then... | -- when +13 Vdc reappears, wait 3 seconds, and then power-up the radio. | | 73, | -- Eric K3NA | _______________________________________________ | Elecraft mailing list | Post to: [hidden email] | You must be a subscriber to post to the list. | Subscriber Info (Addr. Change, sub, unsub etc.): | http://mailman.qth.net/mailman/listinfo/elecraft | | Help: http://mailman.qth.net/subscribers.htm | Elecraft web page: http://www.elecraft.com | | No virus found in this incoming message. | Checked by AVG - http://www.avg.com | Version: 8.0.138 / Virus Database: 270.6.5/1618 - Release Date: 18/08/2008 06:51 | | | _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Eric Scace K3NA
Eric,
The situation should not be a problem for remote stations that are controlled by a computer or some other type of semi-intelligent device. The K3 has a built-in Remote Power ON. After restoration of power, ACC pin 8 can be pulled to ground to activate the Remote Power ON. See page 18 in the manual. Use of that input avoids the issues about transients and other problems that might be present when power is restored. 73, Don W3FPR Eric Scace K3NA wrote: > The need to manually press the power button to turn on the radio is a > problem in remote-controlled stations. If power fails, one must visit > the site to power up the radios. > > That said, there are often many transients when power is first restored. > > An ideal solution would have these attributes: > -- if the radio was powered up when the +13 Vdc supply voltage > disappeared, then... > -- when +13 Vdc reappears, wait 3 seconds, and then power-up the radio. > > 73, > -- Eric K3NA Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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