[AMPS] Reed relays for upgrading T/R switch

[Rich Measures]

>
>In addition to Rich's information, I thought I'd add in a not so obvious
>source. Surplus two-way radios made by Motorola have an outstanding relay
>that will easily switch the exciter side of a TR switch. The Motorola
>Micor and Mitrek two-way radios are often sold at ham fleas for $25 in
>bulk, less when not working. The tr relay is a high speed unit that
>easily takes 100 watts rf, has an ft >500MHz.  The lead coax is often
>teflon or similar.

¿What is the make and break speed of this relay, Skip?.  
>.
>
>>Can the reed relay types sold by Neb. surplus (or similar) be used to
>>upgrade the T/R relay on the SB-220?
>
>>
>I went to the Nebraska Web site.  I saw no info on make speed, break 
>speed or RF current and RF voltage ratings versus frequency.  .  A 
>virtually new, unused, Jennings RJ1A  vac. relay from Fair Radio Sales  
>costs $35.  It will handle c. 3kW @ 50 ohms @ 28MHz.  Two in parallel 
>will handle 12kW @ 28MHz.  .  With a suitable speedup circuit, the RJ1A 
>will switch in1.8mS.  // New, Matsushita shielded rhodium-gold contact, 
>1.0mS, 150w, RF reed relays are available for $10.  See my Web site.  
>High speed switching parts kits, including the RF reed relay, are $20 
>each. - the RJ1A vac. relay is not included..  See circuit in Jan. 1994 
>QST or see Fig. 7B on my Web site.  Very few vacuum relays can switch 
>fast enough to keep up with modern radios.  



Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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