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

[AD6XY - Mike]

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-tp16180386p16196103.html
Sent from the Elecraft mailing list archive at Nabble.com.