RE: [Repeater-Builder] Re: Audio Distorted
Use a sinadder on the receiver when you set the frequency. Then swing the signal generator from side to side to see if the IF is symmetrical. That way you know that the frequency is set right to center the carrier in the receiver pass band properly 73 Gary K4FMX _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG Sent: Saturday, January 27, 2007 2:02 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Audio Distorted Thanks I gave that some Thoughts before I posted and someone Please correct me if I am wrong. The first thing that comes to mind is receiver drifting off frequency. Try having someone come in at +1 or -1 kHz, and see if they sound better. ---Would that also not be on Stronger Signals? --- If the TX was off, I'd expect your receiver AFC to follow it up to a point. But that would be worth checking too. -Right on Freq with Counter and Disc Meter - COULD be an electrolytic in the audio path that isn't much of a cap when it gets cold. Again would that not be noticed on Strong Signals? I did pay a lot for the $50.00 Each Crystals From International. I do recall yrs ago having a Micor in the trunk in the Cold Winters around N/W Indiana it sounded off Freq, but after a Few Min of Transmitting it Warmed up and sounded Great and Again I am talking about the receive , I think I will temporally put a 100Watt light in the 4 ft cabinet and see if I still have the Problem Thanks Don KA9QJG
Re: [Repeater-Builder] Re: Audio Distorted
On 1/27/07, Don KA9QJG [EMAIL PROTECTED] wrote: -Right on Freq with Counter and Disc Meter - The IF chain could be mistuned while the resulting frequency at the end is correct, causing problems. I do recall yrs ago having a Micor in the trunk in the Cold Winters around N/W Indiana it sounded off Freq, but after a Few Min of Transmitting it Warmed up and sounded Great and Again I am talking about the receive , I think I will temporally put a 100Watt light in the 4 ft cabinet and see if I still have the Problem Only a temporary fix. Find the real problem. A properly tuned radio of this vintage with no other problems will NOT exhibit the behavior you're describing. The one in your trunk unfortunately was also not being maintained properly, either... making you think this is a normal thing for Micor's. I respectfully submit that I know a heck of a lot more about MASTR II's than I do about Micor's, but even with that in mind... It's not normal behavior. Something's still wrong. If the light bulb fixes it, at least you'll know it's temperature-related, and can easily take it to a workbench or on-site start spraying things with cold spray to find the real problem. Nate WY0X
RE: [Repeater-Builder] Re: Audio Distorted
Perhaps the receive crystal was changed without having the channel element temperature compensated with it...? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Nate Duehr Sent: Saturday, January 27, 2007 3:53 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Audio Distorted On 1/27/07, Don KA9QJG [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: -Right on Freq with Counter and Disc Meter - The IF chain could be mistuned while the resulting frequency at the end is correct, causing problems. I do recall yrs ago having a Micor in the trunk in the Cold Winters around N/W Indiana it sounded off Freq, but after a Few Min of Transmitting it Warmed up and sounded Great and Again I am talking about the receive , I think I will temporally put a 100Watt light in the 4 ft cabinet and see if I still have the Problem Only a temporary fix. Find the real problem. A properly tuned radio of this vintage with no other problems will NOT exhibit the behavior you're describing. The one in your trunk unfortunately was also not being maintained properly, either... making you think this is a normal thing for Micor's. I respectfully submit that I know a heck of a lot more about MASTR II's than I do about Micor's, but even with that in mind... It's not normal behavior. Something's still wrong. If the light bulb fixes it, at least you'll know it's temperature-related, and can easily take it to a workbench or on-site start spraying things with cold spray to find the real problem. Nate WY0X
RE: [Repeater-Builder] Re: Audio Distorted
Thanks I gave that some Thoughts before I posted and someone Please correct me if I am wrong. The first thing that comes to mind is receiver drifting off frequency. Try having someone come in at +1 or -1 kHz, and see if they sound better. ---Would that also not be on Stronger Signals? --- If the TX was off, I'd expect your receiver AFC to follow it up to a point. But that would be worth checking too. -Right on Freq with Counter and Disc Meter - COULD be an electrolytic in the audio path that isn't much of a cap when it gets cold. Again would that not be noticed on Strong Signals? I did pay a lot for the $50.00 Each Crystals From International. I do recall yrs ago having a Micor in the trunk in the Cold Winters around N/W Indiana it sounded off Freq, but after a Few Min of Transmitting it Warmed up and sounded Great and Again I am talking about the receive , I think I will temporally put a 100Watt light in the 4 ft cabinet and see if I still have the Problem Thanks Don KA9QJG
