[Elecraft] P3 TX Mon question

Fri Aug 14 00:04:45 EDT 2015

Great,   thanks for the clarification,
73 Merv


> Hi Merv,
>
> I don't believe this changes the existing P3TXMON operation with 
> non-Elecraft radios.
>
> Only if Alan detects that its a K3 when the P3 with P3TXMON is powered 
> up will he actually query the radio to see if its in TX. Otherwise it 
> will act as it does now and use detection of forward power to go into 
> TX mode.
>
> Eric
> /elecraft.com/
>
> On 8/13/2015 5:02 PM, Merv Schweigert wrote:
>> Alan, understand that some one will not always be happy with the way 
>> things are,
>> any way to make that a menu selection?
>> I would like to use the P3/TXmon with other radios,  this change 
>> would not allow that?
>> Seems that defeats the ability of the P3 with a TXmon to work with 
>> other radios..
>> Or did I miss something?
>>
>> 73 Merv K9FD/KH6
>>
>>
>>> OK, what I did was change it so that, when a K3 is connected, the P3 
>>> TX monitor will only go into transmit mode when commanded to do so 
>>> by the K3, even if RF power is present on the coax.  That should 
>>> eliminate the false tripping.
>>>
>>> It will be in the next beta release, which should be Real Soon Now.  
>>> :=)
>>>
>>> Alan N1AL
>>>
>>>
>>> On 08/12/2015 01:03 PM, W4CCS wrote:
>>>> Guy:
>>>>
>>>> I agree and hold out hope Elecraft will do something.. If the 
>>>> sensitivity is
>>>> set low for QRP operators, seems they would not need the 2KW sensor.
>>>>
>>>> Maybe have an option in the setup.. Like I stated earlier, it is very
>>>> annoying and quite sure I'm not the only one with this concern..
>>>>
>>>> W4CCS
>>>>
>>>> -----Original Message-----
>>>> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf 
>>>> Of Guy
>>>> Olinger K2AV
>>>> Sent: Wednesday, August 12, 2015 3:46 PM
>>>> To: n1al at sonic.net
>>>> Cc: elecraft at mailman.qth.net
>>>> Subject: Re: [Elecraft] P3 TX Mon question
>>>>
>>>> It would appear that the display needs an option to gate the 
>>>> display with
>>>> the equivent of local TX asserted so it only responds to its own 
>>>> transmitted
>>>> signal.  An option because others might want to know that their TX 
>>>> signal
>>>> was coming back at them on another coax.
>>>>
>>>> Or perhaps set an adjustable gating power level defaulted to one watt.
>>>>
>>>> 73, Guy K2AV
>>>>
>>>> On Wednesday, August 12, 2015, Alan <n1al at sonic.net> wrote:
>>>>
>>>>> The transmit sensor in the P3 TX monitor trips at only a few 
>>>>> tenths of
>>>>> a watt (a few watts with the 2 kW coupler).  It was made sensitive so
>>>>> it would work with QRP.
>>>>>
>>>>> Alan N1AL
>>>>>
>>>>>
>>>>> On 08/12/2015 08:25 AM, W4CCS wrote:
>>>>>
>>>>>> The radio with the TX Mon is on 6 meters only. The HF antennas are
>>>>>> about
>>>>>> 200 feet away and about 150 feet high. That equates to around 90 
>>>>>> feet
>>>>>> Above the six meter antenna.. Thought that would be adequate.
>>>>>>
>>>>>> This never happens on the Power Master meter or on the LP-100.. Only
>>>>>> the TX Mon.
>>>>>>
>>>>>> W4CCS
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Joe Subich, W4TV [mailto:lists at subich.com]
>>>>>> Sent: Wednesday, August 12, 2015 10:51 AM
>>>>>> To: W4CCS; Elecraft
>>>>>> Subject: Re: [Elecraft] P3 TX Mon question
>>>>>>
>>>>>>
>>>>>> Almost certainly "inter station coupling" particularly if the two
>>>>>> antennas were close together and/or the (two radio) antenna switch
>>>>>> lacks sufficient isolation.
>>>>>>
>>>>>> 73,
>>>>>>
>>>>>>       ... Joe, W4TV
>>>>>>
>>>>>>
>>>>>> On 8/12/2015 10:09 AM, W4CCS wrote:
>>>>>>
>>>>>>> Sorry, I did not answer your question..
>>>>>>>
>>>>>>> Yes, the VSWR is showing high and all reflected..
>>>>>>>
>>>>>>> CCS
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf
>>>>>>> Of Joe Subich, W4TV
>>>>>>> Sent: Wednesday, August 12, 2015 9:30 AM
>>>>>>> To: elecraft at mailman.qth.net
>>>>>>> Subject: Re: [Elecraft] P3 TX Mon question
>>>>>>>
>>>>>>>
>>>>>>> As N1AL indicated, the TX MON goes to maximum gain at low signal 
>>>>>>> levels.
>>>>>>> You're probably seeing inter station coupling - hopefully at low 
>>>>>>> levels.
>>>>>>>
>>>>>>> Is the SWR very high - all "reflected"?
>>>>>>>
>>>>>>> 73,
>>>>>>>
>>>>>>>        ... Joe, W4TV
>>>>>>>
>>>>>>>
>>>>>>> On 8/12/2015 9:20 AM, W4CCS wrote:
>>>>>>>
>>>>>>>> I have two K3's and two P3's but only one has the TX Mon option..
>>>>>>>> When I transmit with the K3 that does NOT have the TX Mon
>>>>>>>> installed, the P3 that does have it reacts showing VSWR and one
>>>>>>>> sweep of the transmit
>>>>>>>>
>>>>>>> envelope..
>>>>>>>
>>>>>>>> This seems very strange.. The only thing in common between the two
>>>>>>>> is the MicroHam router program..  Suggestions..??
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Clyde Scott - W4CCS
>>>>>>>>
>>>>>>>> Moultrie, GA - EM81cg
>>>>>>>>
>>>>>>>>
>>>>>>>>
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>