Avionics-List Digest Archive

Fri 06/23/06


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 05:45 AM - Re: Dual Comm Transmitter Problem (Noel Loveys)
 
 
 


Message 1


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    Time: 05:45:18 AM PST US
    From: "Noel Loveys" <noelloveys@yahoo.ca>
    Subject: Dual Comm Transmitter Problem
    --> Avionics-List message posted by: "Noel Loveys" <noelloveys@yahoo.ca> One last question .... What does the audio of the side tone sound like?? Noel > -----Original Message----- > From: owner-avionics-list-server@matronics.com > [mailto:owner-avionics-list-server@matronics.com] On Behalf Of John > Sent: Thursday, June 22, 2006 11:42 PM > To: avionics-list@matronics.com > Subject: Re: Avionics-List: Dual Comm Transmitter Problem > > > --> Avionics-List message posted by: "John" <joplin1@charter.net> > > I am starting to get bogged down with technical stuff that I > don't understand. I think my best solution now is to spend > the $$ and take my aircraft to an Avionics Shop. I have > printed out all of your comments and suggestions. They > should be very helpful when I discuss my transmitter problems > with avionics technicians. I will stay after them until they > have considered all of the possibilities that you have mentioned. > > Actually, my radios are still useable ... just not as good as > I'd like. I will refrain from asking for radio checks in the > future because I know the answer will be "weak and scratchy". > Instead, I will just press on as if I don't have a problem. > I have found that all of the controlling agencies I deal with > read me well enough so that they don't complain. > > Thanks again to all of you. > > John > > ----- Original Message ----- > From: Noel Loveys > To: avionics-list@matronics.com > Sent: Thursday, June 22, 2006 5:32 PM > Subject: RE: Avionics-List: Dual Comm Transmitter Problem > > > --> Avionics-List message posted by: "Noel Loveys" > <noelloveys@yahoo.ca> > > Find some one with a beastie called a Bird Wattmeter. Read > the forward > power and then reverse the slug to read the reflected > power. This will > check the power amp of your transmitter at the same time as > checking your > antenna system. > > While you are at it ask if any one has a Cushman station > analyzer. This > will do much much more. Any one who has this equipment > will know how to use > it. If your radios are certified they may not want to go > near them. Not > because of lack of knowledge but because of legal implications. > > Noel > > > > > -----Original Message----- > > From: owner-avionics-list-server@matronics.com > > [mailto:owner-avionics-list-server@matronics.com] On Behalf > > Of Hopperdhh@aol.com > > Sent: Thursday, June 22, 2006 1:23 PM > > To: avionics-list@matronics.com > > Subject: Re: Avionics-List: Dual Comm Transmitter Problem > > > > > > --> Avionics-List message posted by: Hopperdhh@aol.com > > > > > > > > > > John, > > > > The MFJ-259B needs an SO-239 to BNC adapter and then perhaps > > male-to-male or > > female-to-female BNC connectors to allow it to connect to > > your antenna > > somehow. I have found that you can sometimes take a BNC and > > butcher it up to > > connect directly into the radio tray (after removing the > > radio) to test the whole > > feedline plus antenna. > > > > The 259B does not use the radio for the signal source to > > measure VSWR, it > > has its own signal generator and counter, so it does not go > > inline like a > > standard SWR meter. (VSWR and SWR are used interchangeably > > here. Also the SWR > > meter is sometimes called an SWR bridge -- same thing.) The > > 259B only tests > > the antenna and coax beyond where you connect it in. I > > think you have already > > tested the radio, so this way you can isolate the problem. > > > > Dan Hopper K9WEK > > RV-7A > > > > > > In a message dated 6/22/2006 12:47:29 A.M. Eastern > Daylight Time, > > joplin1@charter.net writes: > > > > I contacted a gentleman who has a 'ham' business in town. > > He deals pretty > > much with the shortwave spectrum, not the VHF. He told me > > that he doesn't > > have the MFJ-259B meter. But, he feels sure that I can > > find someone in a > > local club who does. He mentioned that the meter needs to > > be inserted into the > > feed line between the radio and the antenna and he suspects > > adapters might be > > required to do that. Before I start trying to find someone > > with a MFJ-295B, > > what should I know about inserting the meter into the feed > > line? Remember, I > > am Radio Illiterate. I just want to be sure that I can > > provide the 'ham' with > > the required adapters and any other information that he > > might need. It is > > possible that will have no experience with aircraft radios. > > > > Thanks, > > > > John Linman > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >




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