Following the Compton effect, EMP from a high altitude burst can create
upwards of 50KV per meter squared. Today's advances in discrete components
for military vehicles take this into account and are driving cost factors to
hardened (piece) parts. Some of the effects have been overcome by crow
baring (with instantaneous recovery) power supplies. Also, much effort has
gone into military component design to reduce the impact from transient
radiation effects (on electronics) TREE. We can only hope that none of
these piece parts will ever have to survive such an event!
Kirk, K6KAR
Niceville, FL
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Ron Zond
Sent: Saturday, August 09, 2008 9:12 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Soviet Product Obsolescence
Hi
The tubes in the MiG 25 would survive EMP, but I doubt that the caps,
resistors, and coils would survive. If the discrete components don't work,
nothing else
will. If you want to learn about the MiG 25, get John Barron's book "MiG
Pilot" . It gives an acurate
portrayal of life in the Soviet Air Force of the period through the eyes of
Viktor Belikov,
the pilot who flew the MiG 25 to Chitose Air Base, Japan on Sept 6, 1976. 73
Ron
K3MIY
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Charles Harpole
Sent: Saturday, August 09, 2008 12:26 AM
To: tentec@contesting.com
Subject: [TenTec] Soviet Product Obsolescence
Some years ago, the USA got their hands on a
soviet MIG and were laughing about the all-tube
radios inside..... until they realized their MODERN
transistor radios would be toast in an EMP, whereas
tubes have a chance of survival. Old is not always
bad. 73
Charles Harpole
k4vud@hotmail.com
> Date: Fri, 8 Aug 2008 21:49:39 -0400
> From: wn3vaw@verizon.net
> To: tentec@contesting.com
> Subject: Re: [TenTec] Product Obsolescence
>
> You can still get most tubes -- for a price, but you can get them.
>
> You can still get most discrete components of the thermionic era -- for a
> price, and sometimes you have to settle for a very close substitute, but
you
> can get them.
>
> The day, though, is not far off where these components will become too
> expensive to obtain for the average ham, if they are at all available. And
> when that sad day happens, Jim's comments will be just as appropriate.
>
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of Martin, AA6E
> Sent: Friday, August 08, 2008 6:22 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Product Obsolescence
>
>
> On Fri, Aug 8, 2008 at 3:59 PM, Jim Brown K9YC
> wrote:
>
>> Any product is obsolete when it stops working and cannot readily be
>> repaired. The Hercules I with a blown output device is a prime
>> example of that. I own three Titan 425s and a Hercules II. I can
>> afford to own these nearly 30 year old products because they
>> reasonably well designed, are practical to work on myself, and are
>> utilize parts that I can find at low cost.
>>
>> ...
>
>
>
>>
>> Bottom line -- I'll take a software/firmware based radio any day!
>> The most important thing is buying one from a great company.
>>
>> 73,
>>
>> Jim Brown K9YC
>
>
> I'd accept your facts, but I might come to the opposite conclusion. My 30
> year old Kenwood TS-520S is completely pre-digital and works as well as it
> ever did - far from today's state of the art, but enough for lots of good
HF
> work. There are no exotic parts (no ICs) that couldn't be replaced (or
> substituted for) if anything fails. It could probably run for another 30
> years.
>
> Any radio with custom ICs, microprocessors, etc. (like my Orion) is dead
> when a critical and irreplaceable part fails. In the extreme, you have to
> regard modern rigs as disposable. If they break, it may be more expensive
> to repair than to replace, if repair is even possible.
>
> The good news is that price/performance continues to improve, so maybe you
> would have wanted an excuse to upgrade. ;-)
>
> 73
>
> --
> Martin Ewing, AA6E
> Branford, CT
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|