[Elecraft] Fix the old amplifier......leave the K3 alone!

[K3KO]

Have you tried the inhibit pin (pin 7) of the accessory connector?  It will
hold off rf output until set low.
Those serious VHF/UHF/Microwave ops already probably have sequencers.  This
can just be a part of the sequencing.  See page 19 of the manual. 

Early K3's apparently didn't meet the transmit/receive cycle time for
various digital modes.  Too slow.  10ms helps it do so.  So the needed delay
isn't just a HF/UHF/VHF/Microwave issue.  It is also a mode issue.

de K3KO     



AD6XY - Mike wrote:
> 
> This is a mots worrying post. I think it demonstrates considerable
> ignorance of the many and varied applications of the K3. There is so much
> more to life than HF.
> 
> How do you suggest we speed up a waveguide relay to 10mS?
> 
> 
> 
> 
> 
> Fern Rivard wrote:
>> 
>> Hi Ian and the group:
>> 
>>     I would suggest that you fix/modernize your old amplier and leave the
>> K3 as is!  The problem is NOT with the K3 but rather your amplifier.
>> Upgrade the darn linear with more modern faster switching relays and
>> vacuum relays are not that expensive if you shop around for some good
>> used ones.
>> 
>>     73 from Fern VE7GZ with a fine K3 transceiver
>> 
>> 
>> 
>> 
>> 
>> 
>> ----- Original Message ----- 
>> From: "Ian White GM3SEK" <gm3sek at ifwtech.co.uk>
>> To: <elecraft at mailman.qth.net>
>> Sent: Thursday, March 20, 2008 11:31 AM
>> Subject: Re: [Elecraft] K3 and linear amp
>> 
>> 
>> Roger Marrotte wrote:
>>>I guess as of now I'm out of luck if I want to use my amp with a K3.  I 
>>>just checked the manual for my AL-811H and "The open frame relay in the 
>>>AL-811H takes approximately 15ms to switch states".  My K3 is on order. 
>>>I hope there's a K3 firmware change made before I get my K3, that will 
>>>allow me to adjust the change over timing.  I'm far from an expert with 
>>>amps.  I have no idea what an average switch over time is for amps in 
>>>general.  Ameritron sells a high speed switching option, the QSK-5, 
>>>that reduces the switching time to 1ms.  It costs around $300.00.  A K3 
>>>firmware change would sure be less expensive.
>>>
>> That firmware change is surely needed, but there is another inexpensive 
>> way which often works - speed up that open-frame relay.
>> 
>> The circuit shown in the link below uses the existing relay supply rail, 
>> and it will shorten the switching time of most relays by about one-half. 
>> The same circuit will also convert many older amplifiers to a modern 
>> standards +12V, low-current switch interface.
>> 
>> http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#speedup
>> 
>> 
>> -- 
>> 
>> 73 from Ian GM3SEK         'In Practice' columnist for RadCom (RSGB)
>> http://www.ifwtech.co.uk/g3sek
>> _______________________________________________
>> Elecraft mailing list
>> Post to: Elecraft at mailman.qth.net
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>  http://mailman.qth.net/mailman/listinfo/elecraft    
>> 
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>> 
>> 
>> -- 
>> No virus found in this incoming message.
>> Checked by AVG Free Edition. 
>> Version: 7.5.516 / Virus Database: 269.21.7/1331 - Release Date:
>> 3/16/2008 10:34 AM
>> 
>> 
>> _______________________________________________
>> Elecraft mailing list
>> Post to: Elecraft at mailman.qth.net
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>  http://mailman.qth.net/mailman/listinfo/elecraft
>> 
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>> 
>> 
> 
> 

-- 
View this message in context: http://www.nabble.com/K3-and-linear-amp-tp16180386p16197029.html
Sent from the Elecraft mailing list archive at Nabble.com.