>
>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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