Tom,
If the antenna is that badly compromised, you'll need the external tuner to
get the SWR down to something useable.
Steve
----- Original Message -----
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, January 01, 2014 14:03
Subject: Re: Using MFJ Noise Bridge To Determine Antenna Resonant Frequency
> Kelvin:
>
> Well, rest assured that I absolutely and unequivocally make sure the
> auto-tuner in my TS590 is off when using my amplifier here at the home
> QTH.
> ... That is something that our friend Kevin (K7RX) stressed to me when I
> got
> started into the hole business of using an amplifier, back about 4 or 5
> years ago.
>
> Regarding an MFJ auto-tuner as a possible substitute for the noise bridge
> out in the RV, I had actually thought of that, but didn't think it would
> get
> me that much further ahead, since the TS480 already has a built in auto
> tuner.
>
> My thinking is that the noise bridge might come in handy out at the RV,
> when
> I'm trying to tune a highly-compromise antenna that the TS480's built-in
> auto-tuner won't tune.
>
> I hope this makes sense.
>
> Tom Behler: KB8TYJ
>
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Kelvin Marsh
> Sent: Wednesday, January 01, 2014 1:58 PM
> To: [log in to unmask]
> Subject: Re: Using MFJ Noise Bridge To Determine Antenna Resonant
> Frequency
>
> Hi Tom,
>
> I was very pleased to see that Bob has already answered the question about
> using two or more ATUs in series. I guess you might get away with it if
> using low power, but the voltages can be extremely high and potentially
> dangerous and damaging. To take it a step further, it is highly
> recommended
> to disable a rig's internal ATU if using an amplifier and external ATU.
> Just in case it is accidentally switched on.
>
> I'll throw another observation into the ring, about using the noise bridge
> in your RV. When I checked the prices here in the UK for the MFJ-212, I
> found I could get an LDG 100 watt auto tuner for not much more money
> <smile>!
>
> Best wishes, Kelvin Marsh - M0AID
>
> Working to improve accessibility for radio amateurs with disabilities
>
> www.active-elements.org
>
> For accessibility evaluations of amateur equipment and MP3 manuals
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Tom Behler
> Sent: 01 January 2014 18:32
> To: [log in to unmask]
> Subject: Re: Using MFJ Noise Bridge To Determine Antenna Resonant
> Frequency
>
> Lowell:
>
> That's exactly what I'm thinking here if I use the Noise Bridge at the
> home
> QTH.
>
> I'd put the noise bridge between the TS590 and the amplifier.
>
> At the RV, of course, there's no amplifier to go with the TS480, so excess
> power would not be a concern.
>
> Tom Behler: KB8TYJ
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Lowell Miller
> Sent: Wednesday, January 01, 2014 11:57 AM
> To: [log in to unmask]
> Subject: Re: Using MFJ Noise Bridge To Determine Antenna Resonant
> Frequency
>
> Tom, I have my 212 between the TS2000 and the amplifier.
> I would not want to put the 212 in danger with the output of the amp.
> Happy New Year and 73.
> Lowell W8QIY
> ----- Original Message -----
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, January 01, 2014 11:25 AM
> Subject: Re: Using MFJ Noise Bridge To Determine Antenna Resonant
> Frequency
>
>
>> Howard:
>>
>> I guess I get this, but wouldn't you have to put the tuner in the bypass
>> position?
>>
>> I can do this with my Tentech 238A manual tuner in the shack, but the MFJ
>> 901B manual tuner I would use in the RV does not have a bypass position,
>> at
>> least so far as I know.
>>
>> Tom Behler: KB8TYJ
>>
>>
>> -----Original Message-----
>> From: For blind ham radio operators
>> [mailto:[log in to unmask]]
>> On Behalf Of Howard Kaufman
>> Sent: Wednesday, January 01, 2014 11:13 AM
>> To: [log in to unmask]
>> Subject: Re: Using MFJ Noise Bridge To Determine Antenna Resonant
>> Frequency
>>
>> Set the bridge and tune a receiver until the pulses minimum is heard.
>> Kind
>> of looking for a needle in a haystack.
>>
>>
>> ---
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>
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