If the bridge is rright after the radio, it doesn't see 600 watts.
Simple... If the amp is off or in standby, it sees the antenna.
73
Butch
WA0VJR
Node 3148
Wallace, ks.
On Thu,
29 Aug 2013, Tom Behler wrote:
> Dave:
>
> See my most recent post regarding how to switch the noise bridge in and out
> of my antenna circuit, depending on whether I need to use my Ameritron
> amplifier or not.
>
> Perhaps I'm making this harder than it needs to be, but I would think the
> noise bridge would have to be completely out of the antenna circuit if using
> more than 600 watts, since I believe the maximum amount of power it can
> handle is 300 watts.
>
> Tom Behler: KB8TYJ
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Dave Basden
> Sent: Thursday, August 29, 2013 6:21 PM
> To: [log in to unmask]
> Subject: Re: MFJ Noise Bridge General Quiry
>
> Hi Tom,
>
> The noise bridge is a great way to initially adjust your external tuner.
> Once the tuner is set for minimum noise, you can throw on your amp and fine
> tune the SWR using the TW-1 if you like. That's what I have done here.
> Again, it is important to turn down the RF gain and turn off the AGC.
> Initially I thought it was a dud as I couldn't hear any noise reduction as I
> adjusted the external tuner. Once I turned down the RF gain and turned off
> the AGC, it was quite apparent where the noise lull was as I adjusted the
> tuner.
>
> 73,
>
> Dave, W7OQ
>
> At 10:34 AM 8/29/2013, you wrote:
>> Got it, Howard.
>>
>> These are good points to be noted for sure.
>>
>> I'll be interested in what others have to say, but I especially like
>> the idea of not having to put a signal on the air.
>>
>> Does the noise bridge come with helpful instructions?? I ask this
>> because in my experience with MFJ, their instruction manuals often
>> leave a lot to be desired.
>>
>> Tom Behler: KB8TYJ
>>
>>
>> -----Original Message-----
>> From: For blind ham radio operators
>> [mailto:[log in to unmask]]
>> On Behalf Of Howard, W A 9 Y B W
>> Sent: Thursday, August 29, 2013 1:26 PM
>> To: [log in to unmask]
>> Subject: Re: MFJ Noise Bridge General Quiry
>>
>> Tom,
>>
>> By using the SWR function on your TW1 in the tone mode, you can tune
>> your tuner for the lowest pitch tone which will be of course the lowest
>> SWR. In order to adjust your tuner, you will have to transmit a signal on
> the air.
>>
>> With the MFJ or Vectronics tuner aid, you do not have to put a signal
>> on the air.
>>
>> It must be noted that the tuner aid is rated at 300 watts or less. You
>> would insert this right after your transceiver and adjust your tuner
>> while bypassing your linear amp, if you have one.
>>
>> 73
>>
>> Howard #3
>>
>> ----- Original Message -----
>> From: "Tom Behler" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Thursday, August 29, 2013 12:13 PM
>> Subject: MFJ Noise Bridge General Quiry
>>
>>
>>> Hi, all.
>>>
>>> Please forgive this quiry, since I'm certain that, for many on the
>>> list, it is rather elementary.
>>>
>>> The recent discussion of the MFJ noise bridge, and its possible
>>> discontinuation, is making me want to learn more about the product
>>> and its potential usefulness for me.
>>>
>>> Right now, when I am working with antennas and my Tentech 238A
>>> manual tuner, I use the LDG TW1 to measure SWR, and both forward and
>>> reflected power.
>>> Although I do find the TW1 to be less-than-totally accurate,
>>> especially on the lower bands in comparison to the SWR/watt meter on
>>> my TS590, it has been sufficient in meeting my needs at least for
>>> the most part.
>>>
>>> Is there a compelling reason why I might want to consider purchasing
>>> the MFJ noise bridge? In other words, what could it help me with
>>> that the TW1 is unable to do?
>>>
>>> Of course, one could always make the argument that the MFJ noise
>>> bridge could serve as a useful back-up, should my TW1 die, which may
>>> be a good enough argument in and of itself.
>>>
>>> Just thinking out loud here, I guess.
>>>
>>> Tom Behler: KB8TYJ
>
>
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