BHI HP-200 and other headphones
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I recently bought Yeasu lightweight headphones for the K3 and found out, that the K3 adds hiss with both the front and rear connectors. I have similar problems with the K2. At the moment I use computer headphones- they work nicely, but are not made for communication purposes.On the BHI homepage I found 8 Ohm HP-200 headphones. Is anybody using them? BHI says they should work pretty well with the K3, but they have actually never used them with a K3.
I do not want to spend money again on headphones I can´t use with my K3! 73, Chris-OE5CSP |
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Hi Chris,
The K3 headphone amp (National LM4811) is specified at 106dB S/N ratio so should be pretty noiseless. Using Sennheiser HD600's here with quite high sensitivity which has no noticable noise on the K3. Does the hiss remain with AF gain all the way down? A quick & dirty way to lower the residual amp noise is a small resistor network is series with the headphone output. Not so elegant but might save you from buying yet another headphone... 73' Paul PD0PSB
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Re: BHI HP-200 and other headphones
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<quote author="pd0psb"> Hi Chris, The K3 headphone amp (National LM4811) is specified at 106dB S/N ratio so should be pretty noiseless. Using Sennheiser HD600's here with quite high sensitivity which has no noticable noise on the K3. Does the hiss remain with AF gain all the way down? A quick & dirty way to lower the residual amp noise is a small resistor network is series with the headphone output. Not so elegant but might save you from buying yet another headphone... 73' Paul PD0PSB Hi Paul, The hiss remains even with the AF gain all the way down! The front panel connector is worse than the rear connector, so I always connect the Yaesu FH 77 STA to the rear connector. Could you please tell me how to build the series resistor network? 73, Chris-OE5CSP |
Re: BHI HP-200 and other headphones
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Hi Chris
I am using the YH77STA phones. They are the best phones I have ever used. I have had them for about ten years. There is absolutely no hiss or any residual noise with my K3 AF gain at minimum or any audio hiss at any setting. It suggests that you have an AF amplifier fault. Incidentally my FT1000MK5 and my TS2000 are also totally hiss free. However my IC7000 has considerable hiss as does the FT2000. I don't know about the big Icoms or their new 7600 and would be interested to hear from anybody who has one. 73 Barry VK2BJ -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of OE5CSP-Chris Sent: 5 May 2009 14:33 To: [hidden email] Subject: Re: [Elecraft] BHI HP-200 and other headphones Hi Chris, The K3 headphone amp (National LM4811) is specified at 106dB S/N ratio so should be pretty noiseless. Using Sennheiser HD600's here with quite high sensitivity which has no noticable noise on the K3. Does the hiss remain with AF gain all the way down? A quick & dirty way to lower the residual amp noise is a small resistor network is series with the headphone output. Not so elegant but might save you from buying yet another headphone... 73' Paul PD0PSB Hi Paul, The hiss remains even with the AF gain all the way down! The front panel connector is worse than the rear connector, so I always connect the Yaesu FH 77 STA to the rear connector. Could you please tell me how to build the series resistor network? 73, Chris-OE5CSP -- View this message in context: http://n2.nabble.com/BHI-HP-200--and-other-headphones-tp2792291p2796364.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: BHI HP-200 and other headphones
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> I don't know about the big Icoms or their new 7600 and would be interested
> to hear from anybody who has one. The Icom '7700 and '7800 are nearly hiss-free at the minimum AF setting. My K3 is totally silent using Sony MDR-7506 and Bose Tri-Port headphones. There's generally only one time when I hear hiss from my K3 -- and that's right after a F/W flash. I have now become accustomed to turning power off after the flash is complete, then wait > 5 seconds and re-start. If I do not wait ~ 5 seconds, I oftentimes hear slight latent hiss. But it's cured 100% by this off-on sequence. The rig tried here with the highest latent AF hiss was the TS-950. In fact, the hiss level was so high that VS designed a special relay "cut off" circuit to kill the hiss (and all audio) when the AF control is turned full CCW. On the TS-950, the hiss comes into play when the AF control is just slightly advanced. IOW, at full CCW, a relay opens up the headphone line. And when the AF control is advanced, the relay closes and the hiss becomes apparent. That's the first attempt I've seen by a manufacturer to mask a design problem by using a relay as an audio 'knife switch." Anyone owning a TS-950 can try this test without wearing headphones: Turn the AF control CCW and repeatedly advance and retard the control slightly. Hear that relaying clicking inside the cabinet? That relay's sole purpose is to mask hiss. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: BHI HP-200 and other headphones
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Need to correct myself: I referred to the TS-950 when I meant the FT-950.
Paul, W9AC ----- Original Message ----- From: "Paul Christensen" <[hidden email]> To: <[hidden email]> Sent: Wednesday, May 06, 2009 7:01 AM Subject: Re: [Elecraft] BHI HP-200 and other headphones >> I don't know about the big Icoms or their new 7600 and would be >> interested >> to hear from anybody who has one. > > The Icom '7700 and '7800 are nearly hiss-free at the minimum AF setting. > My > K3 is totally silent using Sony MDR-7506 and Bose Tri-Port headphones. > > There's generally only one time when I hear hiss from my K3 -- and that's > right after a F/W flash. I have now become accustomed to turning power > off > after the flash is complete, then wait > 5 seconds and re-start. If I do > not wait ~ 5 seconds, I oftentimes hear slight latent hiss. But it's > cured > 100% by this off-on sequence. > > The rig tried here with the highest latent AF hiss was the TS-950. In > fact, > the hiss level was so high that VS designed a special relay "cut off" > circuit to kill the hiss (and all audio) when the AF control is turned > full > CCW. > > On the TS-950, the hiss comes into play when the AF control is just > slightly > advanced. IOW, at full CCW, a relay opens up the headphone line. And > when > the AF control is advanced, the relay closes and the hiss becomes > apparent. > That's the first attempt I've seen by a manufacturer to mask a design > problem by using a relay as an audio 'knife switch." > > Anyone owning a TS-950 can try this test without wearing headphones: Turn > the AF control CCW and repeatedly advance and retard the control slightly. > Hear that relaying clicking inside the cabinet? That relay's sole purpose > is to mask hiss. > > Paul, W9AC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by P.B. Christensen
G'day,
Something I still have to quantify but think it might be worth mentioning. Sometimes when first powering up my K3 I feel the audio (headphones) sounds a bit low level for the usual af gain setting. Powering down waiting a few seconds and powering up again always restores normal level. This isn't too common, maybe once in every 30 or so switch on events. Next time I notice it I hope to remember to run something like spectrogram to enable an actual measurement at the phone socket. Regards, Mike VP8NO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: BHI HP-200 and other headphones
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In reply to this post by pd0psb
<quote author="pd0psb"> Hi Chris, The K3 headphone amp (National LM4811) is specified at 106dB S/N ratio so should be pretty noiseless. Using Sennheiser HD600's here with quite high sensitivity which has no noticable noise on the K3. Does the hiss remain with AF gain all the way down? A quick & dirty way to lower the residual amp noise is a small resistor network is series with the headphone output. Not so elegant but might save you from buying yet another headphone... 73' Paul PD0PSB Hi Paul ,Mike and the rest of the gang, I´ve tried various headphones with my K2 and K3: Vivanco TV 60: My favourite headphones for the K2! No hiss, nice audio and lightweight. Use it sometimes with the K3 but there is some hiss, not much but audible. Yaesu Fh-77STH: I really like them, very comfortable, lightweight and very nice audio, but the K3 adds hiss, not much but also audible. Kenwood HS -6: Good headphones for the K3, no hiss, good sound but only mono plug; earpads easily worn out. Koss HP/1 : Got them today from a silent key-very lightweight, nice audio and no hiss on the K3 or K2. No name computer headphones-various types : Useful for the K2 and K3, but not good for communication purposes, no hiss on both rigs. Sennheiser HD 410: Very useful for the low bands, takes away annoying white noise, comfortable but only mono plug; good quality and nice audio. Don´t use them with the K2-they take away too much noise and the K2 is very quiet. 73, Chris |
Re: BHI HP-200 and other headphones
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In reply to this post by OE5CSP-Chris
Just give it a try: Put a potmeter inline L and R channel and turn them until you find the noise acceptable. Sort of like the "passive volume controls" you can find: http://www.scansound.com/xcart/images/P/in-line-volume-control-250.gif http://www.itechnews.net/wp-content/uploads/2008/11/zagg-zbuds-earphones.jpg If you find the appopriate resistance put that as a fixed resistor inline in the left and right channel. Theoratically you now have an impedance mismatch but it has allways worked for me. The scansound product helps-no hiss any more!!!! 73, Chris |
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Good news Chris!
73' Paul
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Re: BHI HP-200 and other headphones
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In reply to this post by OE5CSP-Chris
> I found 8 Ohm HP-200 headphones. Is anybody using them? BHI > says they should work pretty well with the K3, but they have > actually never used them with a K3. 8 Ohm headphones are ... well, 8 Ohm headphones. The issue of hiss with low impedance headphones has been around for quite some time with many transceivers. Some manufacturers "build out" their headphone outputs by placing a 10 to 22 Ohm resistor in series with the headphones to prevent hiss with low Z phones. You are accomplishing the same thing with the passive volume control. Many of the computer headsets are already higher impedance (32 - 64 Ohms) ... as are many professional headsets (up to 600 Ohms) and the Heil ProSet (200 Ohms). If I recall correctly, the high impedance phones also help with the apparent low frequency roll off in the K3 headphone circuit ... 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of OE5CSP-Chris > Sent: Saturday, June 06, 2009 2:48 AM > To: [hidden email] > Subject: Re: [Elecraft] BHI HP-200 and other headphones > > > > > > OE5CSP-Chris wrote: > > > > I recently bought Yeasu lightweight headphones for the K3 and found > > out, that the K3 adds hiss with both the front and rear > connectors. I > > have similar problems with the K2. At the moment I use computer > > headphones- they work nicely, but are not made for communication > > purposes.On the BHI homepage I found 8 Ohm HP-200 headphones. Is > > anybody using them? BHI says they should work pretty well > with the K3, > > but they have actually never used them with a K3. I do not want to > > spend money again on headphones I can´t use with my K3! > > > > 73, Chris-OE5CSP > > > > > > Just give it a try: > Put a potmeter inline L and R channel and turn them until you > find the noise acceptable. Sort of like the "passive volume > controls" you can find: > http://www.scansound.com/xcart/images/P/in-line-volume-control-250.gif > http://www.itechnews.net/wp-content/uploads/2008/11/zagg-zbuds If you find the appopriate resistance put that as a fixed resistor inline in the left and right channel. Theoratically you now have an impedance mismatch but it has allways worked for me. The scansound product helps-no hiss any more!!!! 73, Chris -- View this message in context: http://n2.nabble.com/BHI-HP-200--and-other-headphones-tp2792291p3034501.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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