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#1
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Icom IC-745 question (how does CW mode work?)
I've recently acquired an Icom IC-745 and I'm unclear on how it's supposed
to work in CW mode. It does receive in SSB and AM, so in general the receiver appears to work. When I press the 'mode' button to get it to CW mode, however, it's just... silent. Actually, if I turn up the audio gain, there is some slight noise in the background. If I turn the squelch (close to) all the way up, the green 'receive' LED will go out and there's no detectable noise coming from the speaker. Any idea what I might be doing wrong here? I was expected that there'd still be some hissing (background noise) coming from the radio even in CW mode? Thanks, ---Joel Kolstad |
#2
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It could be the filters. Unless an FL-52 or FL-53 455 khz filter is
installed, the radio doesn't work when switched to narrow. Take a look at page 7-1 in the manual. It shows the various combinations of filters, and which works when. Dick - W6CCD On Mon, 22 Nov 2004 12:13:38 -0800, "Joel Kolstad" wrote: I've recently acquired an Icom IC-745 and I'm unclear on how it's supposed to work in CW mode. It does receive in SSB and AM, so in general the receiver appears to work. When I press the 'mode' button to get it to CW mode, however, it's just... silent. Actually, if I turn up the audio gain, there is some slight noise in the background. If I turn the squelch (close to) all the way up, the green 'receive' LED will go out and there's no detectable noise coming from the speaker. Any idea what I might be doing wrong here? I was expected that there'd still be some hissing (background noise) coming from the radio even in CW mode? Thanks, ---Joel Kolstad |
#3
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I agree the ex-owner probably ripped out the filter.
Frank KG9H "Dick" LeadWinger wrote in message ... It could be the filters. Unless an FL-52 or FL-53 455 khz filter is installed, the radio doesn't work when switched to narrow. Take a look at page 7-1 in the manual. It shows the various combinations of filters, and which works when. Dick - W6CCD On Mon, 22 Nov 2004 12:13:38 -0800, "Joel Kolstad" wrote: I've recently acquired an Icom IC-745 and I'm unclear on how it's supposed to work in CW mode. It does receive in SSB and AM, so in general the receiver appears to work. When I press the 'mode' button to get it to CW mode, however, it's just... silent. Actually, if I turn up the audio gain, there is some slight noise in the background. If I turn the squelch (close to) all the way up, the green 'receive' LED will go out and there's no detectable noise coming from the speaker. Any idea what I might be doing wrong here? I was expected that there'd still be some hissing (background noise) coming from the radio even in CW mode? Thanks, ---Joel Kolstad |
#4
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"Frank Krozel" wrote:
I agree the ex-owner probably ripped out the filter. Frank KG9H "Dick" LeadWinger wrote in message .. . It could be the filters. Unless an FL-52 or FL-53 455 khz filter is installed, the radio doesn't work when switched to narrow. Take a look at page 7-1 in the manual. It shows the various combinations of filters, and which works when. Dick - W6CCD On Mon, 22 Nov 2004 12:13:38 -0800, "Joel Kolstad" wrote: I've recently acquired an Icom IC-745 and I'm unclear on how it's supposed to work in CW mode. It does receive in SSB and AM, so in general the receiver appears to work. When I press the 'mode' button to get it to CW mode, however, it's just... silent. Actually, if I turn up the audio gain, there is some slight noise in the background. If I turn the squelch (close to) all the way up, the green 'receive' LED will go out and there's no detectable noise coming from the speaker. Any idea what I might be doing wrong here? I was expected that there'd still be some hissing (background noise) coming from the radio even in CW mode? Thanks, ---Joel Kolstad I agree also. You're probably missing the CW filter. However check your manual. Every rig I've had with an optional CW filter had a way to route the CW mode through the SSB filter if that filter was not installed, either by the menu or a jumper. |
#5
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On Tue, 23 Nov 2004 04:04:45 GMT, AaronJ wrote:
"Frank Krozel" wrote: I agree the ex-owner probably ripped out the filter. Frank KG9H "Dick" LeadWinger wrote in message . .. It could be the filters. Unless an FL-52 or FL-53 455 khz filter is installed, the radio doesn't work when switched to narrow. Take a look at page 7-1 in the manual. It shows the various combinations of filters, and which works when. Dick - W6CCD On Mon, 22 Nov 2004 12:13:38 -0800, "Joel Kolstad" wrote: I've recently acquired an Icom IC-745 and I'm unclear on how it's supposed to work in CW mode. It does receive in SSB and AM, so in general the receiver appears to work. When I press the 'mode' button to get it to CW mode, however, it's just... silent. Actually, if I turn up the audio gain, there is some slight noise in the background. If I turn the squelch (close to) all the way up, the green 'receive' LED will go out and there's no detectable noise coming from the speaker. Any idea what I might be doing wrong here? I was expected that there'd still be some hissing (background noise) coming from the radio even in CW mode? Thanks, ---Joel Kolstad I agree also. You're probably missing the CW filter. However check your manual. Every rig I've had with an optional CW filter had a way to route the CW mode through the SSB filter if that filter was not installed, either by the menu or a jumper. Even if the CW filter is missing, he should be receiving CW through the standard SSB filter. Just switch to the "CW" mode, and make sure "CW narrow" isn't switched in. At least, that's the way my Icom 735 works. The 745 shouldn't be any different. Bob k5qwg |
#6
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Bob Miller wrote:
Even if the CW filter is missing, he should be receiving CW through the standard SSB filter. Unless the filter was removed incorrectly by a previous owner. For example my TS50 requires that a jumper board be put in place of the CW filter board if it is removed. If the IC745 has such a jumper board, and it was not replaced after a filter removal, then the CW mode might very well appear dead. Just a guess of course. Just switch to the "CW" mode, and make sure "CW narrow" isn't switched in. At least, that's the way my Icom 735 works. The 745 shouldn't be any different. Or maybe it really is operator error as you suggest. Lets hope so... |
#7
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On Wed, 24 Nov 2004 03:30:18 GMT, Bob Miller
wrote: On Tue, 23 Nov 2004 04:04:45 GMT, AaronJ wrote: "Frank Krozel" wrote: I agree the ex-owner probably ripped out the filter. Frank KG9H "Dick" LeadWinger wrote in message ... It could be the filters. Unless an FL-52 or FL-53 455 khz filter is installed, the radio doesn't work when switched to narrow. Take a look at page 7-1 in the manual. It shows the various combinations of filters, and which works when. Dick - W6CCD On Mon, 22 Nov 2004 12:13:38 -0800, "Joel Kolstad" wrote: I've recently acquired an Icom IC-745 and I'm unclear on how it's supposed to work in CW mode. It does receive in SSB and AM, so in general the receiver appears to work. When I press the 'mode' button to get it to CW mode, however, it's just... silent. Actually, if I turn up the audio gain, there is some slight noise in the background. If I turn the squelch (close to) all the way up, the green 'receive' LED will go out and there's no detectable noise coming from the speaker. Any idea what I might be doing wrong here? I was expected that there'd still be some hissing (background noise) coming from the radio even in CW mode? Thanks, ---Joel Kolstad I agree also. You're probably missing the CW filter. However check your manual. Every rig I've had with an optional CW filter had a way to route the CW mode through the SSB filter if that filter was not installed, either by the menu or a jumper. Even if the CW filter is missing, he should be receiving CW through the standard SSB filter. Just switch to the "CW" mode, and make sure "CW narrow" isn't switched in. At least, that's the way my Icom 735 works. The 745 shouldn't be any different. Bob k5qwg Make sure PBT and Filter are not switched. I remember some jumpers that needed changing and that information was in the service manual, might have been for the IC-740 though. For PBT to work the IC-745 required both the 9 MHz and 455 kHz filters be installed. Seem to remember some stuff we did to get it to work with only one filter but has been a long time since I looked into the IC-745 and CW filter installation.. Worked at Icom America for 11 years supporting all products, left 3.5 years ago. Gary K8IZ |
#8
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"Bob Miller" wrote in message
news Even if the CW filter is missing, he should be receiving CW through the standard SSB filter. Just switch to the "CW" mode, and make sure "CW narrow" isn't switched in. Thanks Bob, that works! So the problem was that the narrow filter is missing. :-( Oh well; not that big of a deal. Thanks to everyone for suggestions. ---Joel |
#9
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Bob Miller wrote:
Even if the CW filter is missing, he should be receiving CW through the standard SSB filter. Unless the filter was removed incorrectly by a previous owner. For example my TS50 requires that a jumper board be put in place of the CW filter board if it is removed. If the IC745 has such a jumper board, and it was not replaced after a filter removal, then the CW mode might very well appear dead. Just a guess of course. Just switch to the "CW" mode, and make sure "CW narrow" isn't switched in. At least, that's the way my Icom 735 works. The 745 shouldn't be any different. Or maybe it really is operator error as you suggest. Lets hope so... |
#10
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Bob Miller wrote:
Even if the CW filter is missing, he should be receiving CW through the standard SSB filter. Unless the filter was removed incorrectly by a previous owner. For example my TS50 requires that a jumper board be put in place of the CW filter board if it is removed. If the IC745 has such a jumper board, and it was not replaced after a filter removal, then the CW mode might very well appear dead. Just a guess of course. Just switch to the "CW" mode, and make sure "CW narrow" isn't switched in. At least, that's the way my Icom 735 works. The 745 shouldn't be any different. Or maybe it really is operator error as you suggest. Lets hope so... |
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