AGC Setting for PSK-31
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I have a K3/10 (with a 66' dipole in the attic) and get great
reception on PSK-31. I have two questions. Should AGC be "on" or "off"? Aside from having a dedicated sound card.......is there a Rx or Tx advantage to using an interface like Rigblaster. Thanks again for all the help you have provided! -- Frank KD8FIP _______________________________________________ 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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----- Original Message -----
From: "Frank MacDonell" <[hidden email]> >I have a K3/10 (with a 66' dipole in the attic) and get great > reception on PSK-31. > > I have two questions. Should AGC be "on" or "off"? Aside from having a > dedicated sound card.......is there a Rx or Tx advantage to using an > interface like Rigblaster. Thanks again for all the help you have > provided! The K3 is an excellent receiver so don't cripple the receive chain with a poor soundcard - get a quality soundcard such as the Rigblaster and you'll know there's nothing better you can do. Talk to Joe W4TV - he's active in these forums and can help as well. Use AGC however you want. The K3's dynamic range is so good that using your 66' dipole you'll probably never suffer from strong signal overload, especially if you're able to switch in a narrow filter if the going gets tough, for example in an RTTY contest when 1KW seems to be the minimum power level allowed :-) Simon Brown, HB9DRV www.ham-radio-deluxe.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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----- Original Message -----
From: "Simon (HB9DRV)" <[hidden email]> > > The K3 is an excellent receiver so don't cripple the receive chain with a > poor soundcard - get a quality soundcard such as the Rigblaster and you'll > know there's nothing better you can do. Talk to Joe W4TV - he's active in > these forums and can help as well. > BTW - what's your current soundcard? Simon Brown, HB9DRV www.ham-radio-deluxe.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 |
Re: AGC Setting for PSK-31
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In reply to this post by Simon (HB9DRV)
> The K3 is an excellent receiver so don't cripple the receive > chain with a poor soundcard - get a quality soundcard such as > the Rigblaster and you'll know there's nothing better you can > do. Unfortunately the RigBlaster series of interfaces are not soundcards nor do they - as far as I know - provide any receive interface. They are essentially a transmit interface that provides isolation and switching for the mic line. If you are getting started, connect the line output from your computer sound card to the Line In on the K3 and connect the Line Out of the K3 to the Line in on your computer soundcard and have fun learning all about PSK31. If you don't want the Windows sounds getting from your computer to the radio, consider one of the interfaces with a dedicated USB soundcard, radio control (CAT interface) and other features in one box. Such devices are made by several companies - I'm partial to the microHAM products (www.microHAM-USA.com) but then I distribute them in North and South America. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Simon (HB9DRV) > Sent: Wednesday, January 21, 2009 5:16 PM > To: Frank MacDonell; Elecraft > Subject: Re: [Elecraft] AGC Setting for PSK-31 > > > ----- Original Message ----- > From: "Frank MacDonell" <[hidden email]> > > > >I have a K3/10 (with a 66' dipole in the attic) and get great > >reception on PSK-31. > > > > I have two questions. Should AGC be "on" or "off"? Aside > from having a > > dedicated sound card.......is there a Rx or Tx advantage to > using an > > interface like Rigblaster. Thanks again for all the help you have > > provided! > > The K3 is an excellent receiver so don't cripple the receive > chain with a > poor soundcard - get a quality soundcard such as the > Rigblaster and you'll > know there's nothing better you can do. Talk to Joe W4TV - > he's active in > these forums and can help as well. > > Use AGC however you want. The K3's dynamic range is so good > that using your > 66' dipole you'll probably never suffer from strong signal overload, > especially if you're able to switch in a narrow filter if the > going gets > tough, for example in an RTTY contest when 1KW seems to be > the minimum power > level allowed :-) > > Simon Brown, HB9DRV > www.ham-radio-deluxe.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 _______________________________________________ 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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----- Original Message -----
From: "Joe Subich, W4TV" <[hidden email]> > > Unfortunately the RigBlaster series of interfaces are not soundcards > nor do they - as far as I know - provide any receive interface. They > are essentially a transmit interface that provides isolation and > switching for the mic line. > I never knew taht - seem you're right. I was getting confused here... > > I'm partial to the microHAM products (www.microHAM-USA.com) > A good option. Simon Brown, HB9DRV www.ham-radio-deluxe.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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I recently purchased an SB Live 24 card to use for datamodes, so I could use the built-in Realtek sound for normal computer purposes. I can honestly say I have not noticed any difference either on TX or RX in ordinary sound card operation. I imagine there might be a benefit if I was using it with an SDR (SoftRock, etc.) but I haven't tried that.
Although the K3's receiver may have the dynamic range to handle working with the AGC off I think you would increase the risk of clipping or distortion somewhere in the audio path that would result in "ghost" signals. I prefer to operate with AGC on and use the filtering to exclude other signals that would affect the AGC to the detriment of the one I am trying to copy.
Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html |
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In reply to this post by Joe Subich, W4TV-4
Joe Subich, W4TV wrote: > > > If you don't want the Windows sounds getting from your computer to the radio, consider > one of the interfaces with a dedicated USB soundcard, radio > control (CAT interface) and other features in one box. > > > Or just connect up the K-3 directly and turn the Windows sounds off. They are a PITA anyway. Greg KD7SRC _______________________________________________ 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 |
Re: AGC Setting for PSK-31
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In reply to this post by Julian, G4ILO
> I can honestly say I have not noticed any > difference either on TX or RX in ordinary sound card > operation. With the K3 the Line Out level is sufficient for nearly any sound card as long as care is taken to avoid obvious wiring errors that would introduce noise. However, with some rigs that have limited outputs (some early Kenwood transceivers or the K2 without the W3FPR modification) the signal level is in the noise floor of the soundcard. > Although the K3's receiver may have the dynamic range to > handle working with the AGC off I think you would increase > the risk of clipping or distortion somewhere in the audio > path that would result in "ghost" signals. Without AGC the dynamic range at Line Out is sufficient to drive most soundcards into clipping with an S9 signal if the "no signal" noise floor is set 10 dB above the noise floor of the sound card. Some level of AGC (compression at S9 or above) is beneficial but can also result in blocking by strong signals in a wideband decode mode as you point out. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Julian, G4ILO > Sent: Thursday, January 22, 2009 5:40 AM > To: [hidden email] > Subject: Re: [Elecraft] AGC Setting for PSK-31 > > > > I recently purchased an SB Live 24 card to use for datamodes, > so I could use the built-in Realtek sound for normal computer > purposes. I can honestly say I have not noticed any > difference either on TX or RX in ordinary sound card > operation. I imagine there might be a benefit if I was using > it with an SDR (SoftRock, etc.) but I haven't tried that. > > Although the K3's receiver may have the dynamic range to > handle working with the AGC off I think you would increase > the risk of clipping or distortion somewhere in the audio > path that would result in "ghost" signals. I prefer to > operate with AGC on and use the filtering to exclude other > signals that would affect the AGC to the detriment of the one > I am trying to copy. > > ----- > Julian, G4ILO. K2 #392 K3 #222. > http://www.g4ilo.com/ G4ILO's Shack > http://www.ham-directory.com/ Ham > Directory http://www.g4ilo.com/kcomm.html KComm for > Elecraft K2 and 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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In reply to this post by Julian, G4ILO
> -----Original Message----- > From: [hidden email] [mailto:elecraft- > [hidden email]] On Behalf Of Julian, G4ILO > Sent: Thursday, January 22, 2009 2:40 AM > To: [hidden email] > Subject: Re: [Elecraft] AGC Setting for PSK-31 > > > I can honestly > say > I have not noticed any difference either on TX or RX in ordinary sound > card > operation. I'm using a Thinkpad laptop with my K3. I have a Creative E-MU 0202 connect to an LP-PAN for use with the IF output on the K3. I've been using the built in SoundMAX sound card in the laptop to do the data modes via HRD and DM. So far so good. Would I really see any advantage in using another external sound card for data modes? Isn't the MicroHAM USB Interface II more than just a USB soundcard? Would it really be required? An additional 0202 for data modes would be cheaper. Also, since HRD is using PTT via the LP-Bridge so I don't see the radio try to transmit when/if the computer makes sound via the internal soundcard. It's just like having the Windows sounds disabled. If I pull the plug from the laptops sound output I can hear the laptop sound if/when I need it without having to re-enable the sound card. Adam - ka7ark http://ka7ark.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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> I'm using a Thinkpad laptop with my K3. I have a Creative E-MU 0202 connect
> to an LP-PAN for use with the IF output on the K3. I've been using the built > in SoundMAX sound card in the laptop to do the data modes via HRD and DM. So > far so good. Would I really see any advantage in using another external > sound card for data modes? I find the built-in soundcard function on my various computers to be perfectly adequate for soundcard-based digital modes with my K3 and other radios. I have not run exhaustive tests, but I've not observed any performance improvememt when using the EMU0202 or one of the built-in-soundcard-USB-based-radio-interface widgets here. YMMV 73, Lyle KK7P _______________________________________________ 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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----- Original Message -----
From: "Lyle Johnson" <[hidden email]> > > I find the built-in soundcard function on my various computers to be > perfectly adequate for soundcard-based digital modes with my K3 and > other radios. > A *very* good reason for using a second soundcard is that Windows will not use it for send the clicks, clacks and beeps you hear while playing with your PC. On SSTV it's easy to see when someone is using the internal soundcard instead of second card. A good soundcard will not suffer from intermod - just like a good radio. So even if you don't want to shell out for a microHam spend $50 and get a second soundcard anyway and use this for your radio. Simon Brown, HB9DRV www.ham-radio-deluxe.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 KK7P
While the subject is sound cards internal versus external, It's worth
mentioning an oddity I experience with a Dell laptop's sound card. At least one other ham has an identical problem with his (different model) Dell laptop. Both Dell machines use a Sigmatel sound chip, integrated on the mother board. This chip has a hardware sample rate set in multiples of 24 K, up to 96 ksamples/sec. (Might well be multiples of 12 Ks/s but my tests have all been at 24, 48 and 96 ks/s.) There are many programs in use written for sample rates tied to the CD-ROM 44.1 ks/s rate, and sub-multiples such as 11.025 ks/s. From my experiments, it seems that the Sigmatel chip cannot sample at 44.1 ks/s related rates, and instead samples at the a 24K multiple and synthesizes the requested rate by interpolation. This process is done, I believe, in the sound driver supplied by Dell with the laptop. The problem is that the synthesized sample rate is not close to the right speed. This shows up as a frequency error in the software. I recently ran a test with the newest version of Spectragram, a program I have great confidence in. It allows a selection of sample rates and I cranked an 1850 Hz tone into it. (Believe me, the 1850 Hz tone is accurate to well below +/- 0.01 Hz.) Spectragram reports the following frequencies, based on the sample rate, with the internal A/D chip. (Ks/s) (Hz) Sample Rate Reported Frequency 22.050 1889 44.100 1838 48.000 1850 96.000 1850 These figures are +/- a couple Hz because the FFT bin width has to be considered. I then tried the same experiment with my external E-MU 0202 sound card. No point printing a table, all the readings were 1850 Hz regardless of sample rate selected. So, why is the important? First, it means that you should calibrate your software program, in the event that you have software that allows calibration. Programs known to have odd results when the sample rates are so far off include ARGO and Frisnit's NAVTEX. The NAVTEX decoder not only displays the frequency wrong (1850 Hz tone shows as 1898 Hz) it must use sound card-based timing internally (integrate and dump post-detection filters?) as it has excess errors even for strong clean signals. Switching to the E-MU 0202 external sound card shows essentially perfect decoding under even worse signal conditions. So, it's important to know how your sound card actually behaves. I'll likely write up this, along with some sample files, as a web page over the next couple days. Jack K8ZOA _______________________________________________ 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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----- Original Message -----
From: "Jack Smith" <[hidden email]> > > The problem is that the synthesized sample rate is not close to the > right speed. This shows up as a frequency error in the software. > I believe the problem exists on XP and previous, on VISTA it's fixed. It's due to crappy driver software - I once found all the info in a Microsoft employee's blog. You see this effect in SSTV a *lot*. Simon Brown, HB9DRV www.ham-radio-deluxe.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 Frank MacDonell
One of the premium PCI sound cards highly recommended by N8LP (the M-Audio Audiophile 2496) for use with LP-PAN, albeit with a 90 KHz display limitation, is currently available for $85 at Amazon.com, and it might be found even cheaper elsewhere. http://www.amazon.com/gp/product/B00006I5H5 73, Dave AB7E
_______________________________________________ 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 Simon (HB9DRV)
On Jan 22, 2009, at 10:16 AM, Simon (HB9DRV) wrote: > A good soundcard will not suffer from intermod - just like a good > radio. Not just with intermod, but many mediocre sound cards also suffer from bad second harmonic distortion that could be more troublesome than IMD. I have measured poor ones that have second harmonic distortion as bad as -55 dB, and I have seen traces of the second harmonic of a strong signal from them on a waterfall. I.e., similar to the problem with the K3 Line Output before applying the K8ZOA modifications. Fortunately, unlike IMD, you can nudge the VFO knob a little and get the second harmonic to fall at a different spot in the audio spectrum from a weak signal that you are trying to copy. Simon is right. The reason for using a better quality sound card with narrow band rigs is not necessarily to get a lower noise floor. It is to get lower IMD and harmonic distortion. Even the worst sound card that I have encountered in the past half dozen years had a dynamic range which beats the analog gold standard that we use on HF RTTY, the HAL ST-8000 modem. If you are using filters that only lets through a single signal to the sound card, none of this matters -- you should be able to live with 50 dB of dynamic range if only a single signal reaches the sound card, and the rig's AGC can keep the amplitude of that signal moderately constant. But many of us digital mode operators use at least a 2 kHz bandwidth; that is where good and poor sound cards can make a difference. However IMHO, it is always better to use even a poor external output sound card; to prevent system chimes, music, etc, from getting out on the air. 73 Chen, W7AY _______________________________________________ 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 KK7P
I have both the Navigator and Microkeyer II with built in sound cards and
yes I can see a difference (used on other rigs here). Not much compared to my high end sound card I am using in another computer with the K3. It is not one of those professional jobs, just a gaming one from Creative that cost a few hundred when new. Even that is much better against overload compared to the stock internal sound card. However the new internals are sure better than there were a few years ago! The thing I like using the USB external boxes is normally less wires compared to something like a Rig Blaster Pro. However except for FSK keying the K3 is right up there with very few wires, line in, line out, and RS232 cable. Simple and nice! For years I heard from RTTY contesters to just use the stock internal board sound card. However I do see enough performance advantage to keep using the external boxes or after market sound cards. If you haven't ran calibration on your internal sound card that will also help in performance. I have also found very few internal laptop sound cards that are up to much of the task asked of them, most of the time they are very poor. The two interfaces I mentioned above are worth their weight in gold if I am using my laptop and while bypassing their internal card that most of the time stinks in performance! There are some high in XLS Dels I have seen that don't fall in this category. Like with everything there is always the exception to the rule! 73 de w5jay/jay.. >> I'm using a Thinkpad laptop with my K3. I have a Creative E-MU 0202 >> connect >> to an LP-PAN for use with the IF output on the K3. I've been using the >> built >> in SoundMAX sound card in the laptop to do the data modes via HRD and DM. >> So >> far so good. Would I really see any advantage in using another external >> sound card for data modes? > > I find the built-in soundcard function on my various computers to be > perfectly adequate for soundcard-based digital modes with my K3 and > other radios. I have not run exhaustive tests, but I've not observed > any performance improvememt when using the EMU0202 or one of the > built-in-soundcard-USB-based-radio-interface widgets here. > > YMMV > > 73, > > Lyle KK7P _______________________________________________ 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 Frank MacDonell
HI Adam,
Yes the MKII is more than just a sound card interface. It also has provisions for FSK keying, Winkeyer, Built-in readout that can be configured many ways. PTT/Amp keying buffer, Footswitch input, LNA relay keying. In the virtual router that is used with it has voice message buffers CW, FSK, and voice. I could go on forever. It might not hurt to join their reflector and monitor it for a while. If I wasn't going to do FSK keying I would use what I have for a while and get the feel of things. 73 de jay/w5jay.. > > I'm using a Thinkpad laptop with my K3. I have a Creative E-MU 0202 > connect > to an LP-PAN for use with the IF output on the K3. I've been using the > built > in SoundMAX sound card in the laptop to do the data modes via HRD and DM. > So > far so good. Would I really see any advantage in using another external > sound card for data modes? Isn't the MicroHAM USB Interface II more than > just a USB soundcard? Would it really be required? An additional 0202 for > data modes would be cheaper. > > Also, since HRD is using PTT via the LP-Bridge so I don't see the radio > try > to transmit when/if the computer makes sound via the internal soundcard. > It's just like having the Windows sounds disabled. If I pull the plug from > the laptops sound output I can hear the laptop sound if/when I need it > without having to re-enable the sound card. > > Adam - ka7ark > http://ka7ark.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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> -----Original Message-----
> From: [hidden email] [mailto:elecraft- > [hidden email]] On Behalf Of Jay Bromley > Sent: Thursday, January 22, 2009 12:00 PM > To: [hidden email] > Subject: Re: [Elecraft] AGC Setting for PSK-31 I just did a little poking around for USB sound cards. The link http://www.usbgear.com/USB-Sound.html has a slew of USB sound cards packaged a variety of different ways. The specs on these devices appear to be identical. Probably the same internals, just package a variety of ways for marketing purposes. When specs are listed they all appear to be about the same, Sampling rate (fs): 32, 44.1, 48 kHz. I looked for specs on the internal sound card in the Thinkpad T60p. It uses a AD1981HD: HD Audio SoundMAXR Codec. The specs seem to be about the same as all these other USB devices. HD audio sample rates 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz Greater than 90 dB dynamic range S/PDIF output: 32 kHz, 44.1 kHz or 48 kHz, 16- or 24-bit Doesn't look like any of these $20 devices would gain me a thing. I was just looking for a cheap alternative to play with..... Adam - ka7ark _______________________________________________ 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 |
Re: AGC Setting for PSK-31
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In reply to this post by Adam Koczarski
> Also, since HRD is using PTT via the LP-Bridge so I don't see > the radio try to transmit when/if the computer makes sound > via the internal soundcard. That's fine if no other program (or Windows) decides to send something to the sound card while you are transmitting. It also works if you don't run anything else while running DM780. However, there are reasons for a second sound card ... and a need for other station control/interfacing capabilities in some of the "purpose built" interfaces. If you are comfortable with the capabilities of your built-in soundcard, congratulations. > Isn't the MicroHAM USB Interface II more than just a USB > soundcard? Would it really be required? An additional 0202 > for data modes would be cheaper. The USB Interface II is not a sound card ... it is a purpose built USB to serial converter with audio isolation transformers. The audio capabilities are redundant with the K3 since it has transformer isolated line in/line out. > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Adam Koczarski > Sent: Thursday, January 22, 2009 12:28 PM > To: [hidden email] > Subject: Re: [Elecraft] AGC Setting for PSK-31 > > > > > -----Original Message----- > > From: [hidden email] [mailto:elecraft- > > [hidden email]] On Behalf Of Julian, G4ILO > > Sent: Thursday, January 22, 2009 2:40 AM > > To: [hidden email] > > Subject: Re: [Elecraft] AGC Setting for PSK-31 > > > > > > I can honestly > > say > > I have not noticed any difference either on TX or RX in > ordinary sound > > card operation. > > I'm using a Thinkpad laptop with my K3. I have a Creative > E-MU 0202 connect to an LP-PAN for use with the IF output on > the K3. I've been using the built in SoundMAX sound card in > the laptop to do the data modes via HRD and DM. So far so > good. Would I really see any advantage in using another > external sound card for data modes? Isn't the MicroHAM USB > Interface II more than just a USB soundcard? Would it really > be required? An additional 0202 for data modes would be cheaper. > > Also, since HRD is using PTT via the LP-Bridge so I don't see > the radio try to transmit when/if the computer makes sound > via the internal soundcard. It's just like having the Windows > sounds disabled. If I pull the plug from the laptops sound > output I can hear the laptop sound if/when I need it without > having to re-enable the sound card. > > Adam - ka7ark > http://ka7ark.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 _______________________________________________ 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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> -----Original Message----- > From: Joe Subich, W4TV [mailto:[hidden email]] > Sent: Thursday, January 22, 2009 4:27 PM > To: 'Adam Koczarski'; [hidden email] > Subject: RE: [Elecraft] AGC Setting for PSK-31 > > That's fine if no other program (or Windows) decides to send > something to the sound card while you are transmitting. It > also works if you don't run anything else while running DM780. > However, there are reasons for a second sound card ... and a > need for other station control/interfacing capabilities in > some of the "purpose built" interfaces. > > If you are comfortable with the capabilities of your built-in > soundcard, congratulations. > using a laptop with only a few radio related programs installed on it for use with my K3. I guess disabling the Windows sounds would be the best solution if you don't have enough sound cards to run the apps you're using. I already have two, one for the LP-PAN and the internal card I'm using for data transmissions, so I guess I'd need a third sound card. > The USB Interface II is not a sound card ... it is a purpose > built USB to serial converter with audio isolation transformers. > The audio capabilities are redundant with the K3 since it has > transformer isolated line in/line out. > Thank you for the clarification. Adam - ka7ark _______________________________________________ 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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