[1000mp] Frozen SWR

[Roy Westra]

Keep it simple, last year I remodeled the shack and am using only my Mark V and two antennas. For me, anyway, it eliminated a lot of frustration and the added expense when I blew things up. 

Roy
AA6QQ

Sent from my iPhone

> On Nov 9, 2014, at 6:44 AM, Tod Olson <tod at k0to.us> wrote:
> 
> Gentlemen:
> 
> Let me begin by stating that the problem has been solved and apologizing
> for incomplete testing on my part which caused me to write an appeal for
> suggestions prematurely.
> 
> The problem was ³pilot² or ³operator² error. I operate a rather complex
> SO2R station where all of the antennas are distributed correctly to each
> of the radios as  a function of the frequency the radio is operating on.
> When one changes bands on either radio the correct antenna for the band is
> routed to the radio automatically by circuits that decode the band and
> select the correct relays in a relay matrix to activate. Naturally, there
> are protective circuits to prevent both radios being able to access the
> same antenna at the same time or operate on the same band at the same
> time. 
> 
> Somehow, someone [we know who the someone was ] manually selected the band
> for the Œfailing¹ FT1000MP and bypassed the normal auto-band selection for
> that radio. That meant that the antenna going to that radio was the
> manually selected one, not the auto-selected one. The result was the SWR
> was more than 3:1 on every band but one and the good band was never one
> that I checked when testing. As a result the radio very correctly turned
> down the power.  Once my early morning [ 6:00 AM Sunday morning here in
> Idaho ] testing of everything from the antenna to the radio was completed
> I had found the culprit [me] and corrected his stupid error. At various
> times in the process I had suspected many different things were failing;
> bandpass filters, relay selection matrices, relays, antennas, etc. I bring
> that up because I have found ‹ especially as I grow older, that careful
> testing of things before taking action can often save many fruitless hours
> of unneeded repair or additional testing of components that are not really
> failing.
> 
> At this point I don¹t try to fix circuits or equipment until I am
> absolutely sure that circuit or equipment is truly causing bad things.
> 
> The good things that came out of my inquiry are the references that were
> provided by Ron, W8GUS, Bill, WD8ARZ and Lance, WN0L. I will be following
> up on your references to add them to my collection of FT1000MP notes. I
> truly appreciate your taking the time to assist me.
> 
> Best 73,
> 
> Tod, K0TO
> 
> 
> 
>> On 11/8/14, 11:17 PM, "Tod" <tod at k0to.us> wrote:
>> 
>> I have an FT1000MP.
>> 
>> Recently I used the tuner to adjust the SWR to a low level for
>> transmitting. The tuner functioned properly and the SWR level dropped to
>> close to 1:1 .
>> 
>> Later, I changed frequency sufficiently to know that I should retune.
>> This time when I pressed the TUNE button I got the WAIT light but no
>> change in SWR and no action I could detect occurring with the tuner.
>> 
>> I switched the output to a 50 ohm dummy load. Turned off the tuner and
>> sent CW at about 10 watts output. The SWR showed full scale. If I
>> increased the RF output the limiting circuits in the radio cut it back to
>> perhaps 35 watts of output.
>> 
>> I checked the output with an independent power meter. The power out was
>> at the level shown by the FT1000MP power meter. The reflected power shown
>> by the independent meter was close to zero. The SWR shown on the
>> independent meter was about 1:1.2 which was expected. The FT1000MP still
>> showed full scale SWR.
>> 
>> I would welcome any comments or suggestions from people reading this
>> concerning how I might correct this problem.
>> 
>> Tod, K0TO
>> 
>> 
>> Sent from my iPad air
>> 
>> ______________________________________________________________
>> 1000mp mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/1000mp
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:1000mp at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> 
> 
> ______________________________________________________________
> 1000mp mailing list
> Home: http://mailman.qth.net/mailman/listinfo/1000mp
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:1000mp at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html