[digitalradio] Re: Microphone putting audio into PSK transmissions
--- In digitalradio@yahoogroups.com, [EMAIL PROTECTED] wrote: Hi, If mic gain is down what happens ? On my IC-737A interface to ACC1 and mic gain to zero and bye. 73 Vilnis/YL2KF
Re: [digitalradio] Re: Microphone putting audio into PSK transmissions
Don't you need some mic gain to get a SSB signal generated with PSK? Andy On Tue, Jun 17, 2008 at 3:22 AM, Vilnis Vosekalns [EMAIL PROTECTED] wrote: --- In digitalradio@yahoogroups.com, [EMAIL PROTECTED] wrote: Hi, If mic gain is down what happens ? On my IC-737A interface to ACC1 and mic gain to zero and bye. 73 Vilnis/YL2KF -- Andy K3UK www.obriensweb.com (QSL via N2RJ)
Re: [digitalradio] Re: Microphone putting audio into PSK transmissions
Not when feeding the audio into ACC-1 instead of the mic connector. ACC-1 on the 746 has a constant level input. All adjustments to the audio level are made external to the rig in that case. This is the part I overlooked when trying to cut the mic audio off hi hi! 73 Dave KB3MOW Andrew O'Brien wrote: Don't you need some mic gain to get a SSB signal generated with PSK? Andy On Tue, Jun 17, 2008 at 3:22 AM, Vilnis Vosekalns [EMAIL PROTECTED] mailto:yl2kf%40arrl.net wrote: --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, [EMAIL PROTECTED] wrote: Hi, If mic gain is down what happens ? On my IC-737A interface to ACC1 and mic gain to zero and bye. 73 Vilnis/YL2KF -- Andy K3UK www.obriensweb.com (QSL via N2RJ)
Re: [digitalradio] Re: Microphone putting audio into PSK transmissions
It appears that with many of the ICOM rigs, the microphone gain controls only the microphone input from the front panel connection. The rear connectors, whether ACC-1, or in the case of the 746 series, the additional 6 pin min DIN are a set level and the control is done by the amount of audio applied to that rear connector. Since the 756 series has the D mode you can switch that on to turn off the mike (and a few other changes) or you could turn down the mike gain to zero. Either way it requires some action on the part of the operator. With the 746 series, and others such as the 7000, you can connect to the 6 pin mini DIN jack which isolates digital modes from the microphone circuit. This seems a better way to use digital modes with the rigs that have that feature. I recently ordered a Tigertronics Signalink USB and when I was on the phone with them and they found out I was interfacing to my 7000, they strongly recommended that I use the 6 pin mini DIN jack in lieu of the 13 pin DIN jack since it would avoid any microphone issues when using digital modes. So if you have the 6 pin mini DIN it seems that this would be the best way to operate digital modes. As I mentioned earlier, the main reason that the 13 pin jack is used by some interface manufacturers, may be their need to tap into the 13.8 VDC to run the interface. In such a case you would need auxiliary power and would not have a single connection point to the rig. With the interfaces I mentioned earlier, you avoid this. Does anyone have any information that would suggest otherwise? 73, Rick, KV9U Dave 'Doc' Corio wrote: Not when feeding the audio into ACC-1 instead of the mic connector. ACC-1 on the 746 has a constant level input. All adjustments to the audio level are made external to the rig in that case. This is the part I overlooked when trying to cut the mic audio off hi hi! 73 Dave KB3MOW
RE: [digitalradio] Re: Microphone putting audio into PSK transmissions
Not sure if Vilnis or Andy are directing this at my early comment, but I will explain and repeat it. The situation to which I referred was for the Icom IC-746 only, and for the early models of the series. Further, it applied to the situation where the soundcard interface is connected via the 8 pin accessory port on the back panel [and NOT the microphone jack on front]. Now this is what Tigertronics states on its website about the early IC-746 models: Some customers have reported that the IC-746 (early model only) does NOT mute the Mic when keyed from the Accy Port. If this is the case with your radio, then you will need to turn the radio's Mic Gain down and/or unplug the microphone. On the IC-746, the Mic Gain adjustment in on the front panel and according to these instructions, one just turns in all the way down. This will not, according to Tigertronics, affect the operation via the accessory port. Now, on the 756 Pro 3 when the mode is selected as USB-D, instead of just USB [or LSB-D instead of LSB], then the soundcard control is directed via the ACC 1 port and the mic is muted. I am not sure if a similar option exists on the later versions of the IC-746 - I have never owned that radio. I am sure the 746 group would have the answer. 73 / Larry / W2ZEY _ From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Andrew O'Brien Sent: Tuesday, June 17, 2008 7:23 AM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] Re: Microphone putting audio into PSK transmissions Don't you need some mic gain to get a SSB signal generated with PSK? Andy On Tue, Jun 17, 2008 at 3:22 AM, Vilnis Vosekalns [EMAIL PROTECTED] mailto:yl2kf%40arrl.net wrote: --- In digitalradio@ mailto:digitalradio%40yahoogroups.com yahoogroups.com, [EMAIL PROTECTED] wrote: Hi, If mic gain is down what happens ? On my IC-737A interface to ACC1 and mic gain to zero and bye. 73 Vilnis/YL2KF
[digitalradio] Re: Microphone putting audio into PSK transmissions
Dave, you have to switch to Digital SSB. By pressing and holding the USB/LSB button for 1 sec. the Radio will show D-USB or D-LSB. This will effectively de-couple any Microphone, Radio-wise (internally). ... workes for me 73 Steve, W1CDX --- In digitalradio@yahoogroups.com, Dave [EMAIL PROTECTED] wrote: I'm using the ACC jack on the rear of my IC-746 for digital mode audio from my computer. Convenient, but the downside is that the microphone picks up audio from the room and that also gets transmitted. For this reason I'm considering building a mic switch box that will allow me to switch the mic out of the circuit without having to remove it from the front connector on the rig every time I use a digital mode. My question is, can I simply use a rotary wafer switch with eight contacts to switch between no microphone, my headset, and my hand mic? Would there be a need for any electronics at all? An even bigger question is, might there be a simpler way to kill the audio from the microphone without going through all this? All input appreciated! Tnx es 73 Dave KB3MOW
Re: [digitalradio] Re: Microphone putting audio into PSK transmissions
The 746 doesn't have that option. Maybe the Pro does, but I have the non-pro. Tnx anyway 73 Dave KB3MOW Steve Hunt wrote: Dave, you have to switch to Digital SSB. By pressing and holding the USB/LSB button for 1 sec. the Radio will show D-USB or D-LSB. This will effectively de-couple any Microphone, Radio-wise (internally). ... workes for me 73 Steve, W1CDX --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, Dave [EMAIL PROTECTED] wrote: I'm using the ACC jack on the rear of my IC-746 for digital mode audio from my computer. Convenient, but the downside is that the microphone picks up audio from the room and that also gets transmitted. For this reason I'm considering building a mic switch box that will allow me to switch the mic out of the circuit without having to remove it from the front connector on the rig every time I use a digital mode. My question is, can I simply use a rotary wafer switch with eight contacts to switch between no microphone, my headset, and my hand mic? Would there be a need for any electronics at all? An even bigger question is, might there be a simpler way to kill the audio from the microphone without going through all this? All input appreciated! Tnx es 73 Dave KB3MOW
[digitalradio] Re: Microphone putting audio into PSK transmissions
Hi Dave, Many transceivers have automatic muting of the microphone whenever the rear panel accessory jack PTT is in use... and they do not require external switching or modification. However, some Icom transceivers and other brands do not have internal muting of the microphone muting when the rear panel audio/PTT is enabled. A simple modification of the Icom HM-36 microphone results in the muting of the microphone whenever the microphone's PTT button is not being pushed. It enables the computer to interface via the transceiver's rear panel data accessory jack, without ambient audio entering via the hot microphone during computer audio transmissions. CLICK HERE TO VIEW THE MOD: http://hflink.com/icom/microphone/hm36/ This mod provides an easy viable solution that does not require modification of the transceiver itself. The principles used in this modification may be applied to other brands of transceivers and microphones. 73 Bonnie VR2/KQ6XA Dave KB3MOW wrote: I'm using the ACC jack on the rear of my IC-746 for digital mode audio from my computer. Convenient, but the downside is that the microphone picks up audio from the room and that also gets transmitted. ... might there be a simpler way to kill the audio from the microphone without going through all this?
Re: [digitalradio] Re: Microphone putting audio into PSK transmissions
Thanks, Bonnie. While I'm sure that would solve the problem with the hand-held, it only addresses half the issue. When the XYL is in the shack (her computer desk is 90 degrees and 4 feet away from mine) I use the headset mic so as to cause as little QRM to her while she works (she works from home). I guess unless someone tells me that a rotary wafer switch won't do the trick for me, I'm going to try to build one. Tnx es 73 Dave KB3MOW expeditionradio wrote: Hi Dave, Many transceivers have automatic muting of the microphone whenever the rear panel accessory jack PTT is in use... and they do not require external switching or modification. However, some Icom transceivers and other brands do not have internal muting of the microphone muting when the rear panel audio/PTT is enabled. A simple modification of the Icom HM-36 microphone results in the muting of the microphone whenever the microphone's PTT button is not being pushed. It enables the computer to interface via the transceiver's rear panel data accessory jack, without ambient audio entering via the hot microphone during computer audio transmissions. CLICK HERE TO VIEW THE MOD: http://hflink.com/icom/microphone/hm36/ http://hflink.com/icom/microphone/hm36/ This mod provides an easy viable solution that does not require modification of the transceiver itself. The principles used in this modification may be applied to other brands of transceivers and microphones. 73 Bonnie VR2/KQ6XA Dave KB3MOW wrote: I'm using the ACC jack on the rear of my IC-746 for digital mode audio from my computer. Convenient, but the downside is that the microphone picks up audio from the room and that also gets transmitted. ... might there be a simpler way to kill the audio from the microphone without going through all this?
[digitalradio] Re: Microphone putting audio into PSK transmissions
To mute the mic audio, you only need to short the microphone hot pin to ground. A simple single pole single throw switch (normally open) will work. However, you will need to manually switch it each time you transmit... and perhaps that is rather sloppy station control. Bonnie --- In digitalradio@yahoogroups.com, Dave 'Doc' Corio [EMAIL PROTECTED] wrote: I guess unless someone tells me that a rotary wafer switch won't do the trick for me, I'm going to try to build one. Tnx es 73 Dave KB3MOW CLICK HERE TO VIEW THE MOD: http://hflink.com/icom/microphone/hm36/
Re: [digitalradio] Re: Microphone putting audio into PSK transmissions
Well, my plan is to use two 8-pin mic jacks on a small enclosure, with an 8-wire line out to the mic input of the 746. A rotary wafer switch with 8 poles and three positions should allow me to switch between the hand-held mic, the headset mic, or a blank position coresponding to no mic. When I'm going to run digital modes, I'd simply select the no mic position so that room audio doesn't get transmitted. In either of the other two positions, for SSB operation, all pins would be active on the selected mic, and PTT, audio, and controls should be functional. I don't see that as being sloppy at all. Tnx es 73 Dave KB3MOW expeditionradio wrote: To mute the mic audio, you only need to short the microphone hot pin to ground. A simple single pole single throw switch (normally open) will work. However, you will need to manually switch it each time you transmit... and perhaps that is rather sloppy station control. Bonnie --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, Dave 'Doc' Corio [EMAIL PROTECTED] wrote: I guess unless someone tells me that a rotary wafer switch won't do the trick for me, I'm going to try to build one. Tnx es 73 Dave KB3MOW CLICK HERE TO VIEW THE MOD: http://hflink.com/icom/microphone/hm36/ http://hflink.com/icom/microphone/hm36/
RE: [digitalradio] Re: Microphone putting audio into PSK transmissions
Hi Dave, Rather than switching all eight lines (so you might be able to use a cheaper and easier to wire switch) I'd look at which lines are used for what purpose, and make some intellegent decisions about what you're using, and what needs to be switched. For example, you shouldn't need to switch any ground connections. You probably don't need to switch the PTT connection, though if you key the wrong mike, (except on AM/FM) you won't get any power output. If you don't use the up/down functions then they don't need to be connected. If you can get your list of required connections down to 3 or 4, depending on the switch, it could be a single-deck switch. Or you may only find a switch with 12 (or 6) positions, but the ability to put a stop in the switch, to limit rotation. That switch will have more decks, with some (to many) terminals unused. You'll also want to consider whether RF suppression will be needed - such as if you use a plastic enclosure, which (unless it's sprayed with shielding paint) will lack shielding, and could create an RF feedback problem for you. Just things to consider. Unless you like learning the hard way! grin 73, Bob, KD7NM -Original Message- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Dave 'Doc' Corio Sent: Monday, June 16, 2008 2:20 PM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] Re: Microphone putting audio into PSK transmissions Well, my plan is to use two 8-pin mic jacks on a small enclosure, with an 8-wire line out to the mic input of the 746. A rotary wafer switch with 8 poles and three positions should allow me to switch between the hand-held mic, the headset mic, or a blank position coresponding to no mic. When I'm going to run digital modes, I'd simply select the no mic position so that room audio doesn't get transmitted. In either of the other two positions, for SSB operation, all pins would be active on the selected mic, and PTT, audio, and controls should be functional. I don't see that as being sloppy at all. Tnx es 73 Dave KB3MOW expeditionradio wrote: To mute the mic audio, you only need to short the microphone hot pin to ground. A simple single pole single throw switch (normally open) will work. However, you will need to manually switch it each time you transmit... and perhaps that is rather sloppy station control. Bonnie --- In digitalradio@yahoogroups.com mailto:digitalradio%40yahoogroups.com, Dave 'Doc' Corio [EMAIL PROTECTED] wrote: I guess unless someone tells me that a rotary wafer switch won't do the trick for me, I'm going to try to build one. Tnx es 73 Dave KB3MOW CLICK HERE TO VIEW THE MOD: http://hflink.com/icom/microphone/hm36/ http://hflink.com/icom/microphone/hm36/ Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked Check our other Yahoo Groups http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/themixwgroup Yahoo! Groups Links
