[Elecraft] KPA-500 from Orlando

[Dave Perry]

I have been thinking about a similar scenario in switching between two amps 
when the new KPA500 comes available.  In my case I would like to use the 
KPA500 most of the time and only revert to my vintage Drake L7 amp in the 
rare instances when I really need 1.3 KW.  I am wondering if I can run the 
KPA500 at 500 W through the bypass circuit of the L7 if the L7 is off or in 
standby status.  The L7 manual doesn't mention any power limitations for the 
bypass circuit.  It certainly handles 100 W with no problem.  Does anyone 
have any thoughts on this?  Otherwise, I guess I will have to come up with 
some type of a DTDP switching scheme to switch the K3 and antennas between 
the two amps.  Another option would be to buy another K3 and go SO2R.

Dave, N4QS


----- Original Message ----- 
From: "Bill K9YEQ" <k9yeq at live.com>
To: <don at w3fpr.com>
Cc: "'Elecraft'" <elecraft at mailman.qth.net>
Sent: Tuesday, February 15, 2011 5:37 PM
Subject: Re: [Elecraft] KPA-500 from Orlando


> Don,
>
> Thank you for your input.  I would also want band switching to work with
> both.  I know if I shut off the 2.5KFX it is bypassed.  The issue is to
> control both, with one or the other shut off.  I operate lots with the 2.5
> shut off.  I also have the P3, which shouldn't be an issue, I would think.
> I need to get the KPA-500 soon so the other half doesn't notice too much
> change and before she retires.   Have been loading up the shack if you 
> know
> what I mean.  :-)
>
> Also,  I have not resolved the KX-1 question yet, so when I get time will
> try one more time and if not successful will send to you.  I am not about 
> to
> retire, so am so busy I have trouble keeping up with all the great 
> Elecraft
> stuff that I keep adding just so I have it.  I even miss updates unless I 
> am
> a beta tester.  If I get the beta it avoid so much of the watching the 
> list.
> Most beta's are perfect.
>
> Bill
> K9YEQ
>
>
> -----Original Message-----
> From: Don Wilhelm [mailto:w3fpr at embarqmail.com]
> Sent: Tuesday, February 15, 2011 5:26 PM
> To: Bill K9YEQ
> Cc: Elecraft
> Subject: Re: [Elecraft] KPA-500 from Orlando
>
>  Bill,
>
> I don't know how many lines you have connected between the THP and the K3,
> but the simplistic view would be to use a relay to switch the RF input
> between the two amplifiers and also place the non-selected one in Standby.
> Of course that simplistic solution would require that both amplifiers have
> an input signal line to place the amp into standby remotely - many do not,
> but modern amplifiers should IMHO.  Older amplifiers typically have only a
> front panel switch.
>
> 73,
> Don W3FPR
>
> On 2/15/2011 6:15 PM, Bill K9YEQ wrote:
>> Wayne,
>>
>> I have my THP HL-2.5kfx, is there a way to control both via the K3?  I
>> would like to select the device to use based on conditions without
>> going through a lot of switching.
>>
>> Bill
>> K9YEQ
>>
>
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