However, Allen Bond at www.mgs4u.com sells a wide range of vacuum relays
and other high power stuff, both new and from surplus for very
reasonable prices, and he stands behind his goods 100 percent. No
connection, just a satisfied customer.
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at
reversebeacon.blogspot.com
On 4/8/2010 8:47 AM, TexasRF@aol.com wrote:
> Roger and all, re: Chinese vacuum relays:
>
> I have purchased a couple of these from Gigavac in the last year. I have to
> say that they work great and look great. I would buy more as needed
> without hesitation.
>
> If you let them know it for ham radio use, you get a big discount in price.
> The last one I purchased was rated for about 20kv and 25 A cost about
> $150. I have seen old (and leaky vacuum) relays on Ebay for more $$.
>
> You can get exactly what you need, hot switch, not hot switch, mounting
> arrangement, coil voltage, n/o, n/c, double throw so no need to improvise the
> circuit to fit what you find surplus or used. The sales rep will find the
> needed version in a flash and take your credit card order in two flashes.
>
> 73,
> Gerald K5GW
>
>
>
>
> In a message dated 4/7/2010 9:28:30 P.M. Central Daylight Time,
> sub1@rogerhalstead.com writes:
>
>
>
> JayKay wrote:
>
>> Thanks to all for your inputs. I am going to try cleaning the relay
>>
> contacts and watch alignment, etc.
>
>> If I can't get it going (contacts beyond repair), I would like to
>>
> replace the relay but a quick Google shows the KA-3702 relay by PB doesn't
> exist.
>
>
>>
>>
> Go to Mouser and try to find a how ever many pole relay with the same
> ratings and pin out. You might not be able to find a direct pin for pin
> replacement, but that's better than having to rig up something. If
> you're a CW op this would be a good opportunity to go QSK. However It's
> really difficult to find any suitable US made vacuum relays any more.
> Word is that many now say "made in China". I'd probably go for some of
> the Russian surplus vacuum relays.
>
> 73
>
> Roger (K8RI)
>
>> My thinking is to grab the 120VDC present in the rig and regulate it
>>
> down to 5VDC or 12VDC (once I know the resistance of the coil) and then get a
> 10 amp 3PDT relay. It will also make it easier to interface with newer rigs
> that don't like 120V switched to ground through their internal relays.
>
>> I could use a series resistor (with the R of the coil) to step it down
>>
> but I don't want to hot switch 120V (at T = 0) to any external relays
>
>> 1) Anyone have the KA-3702 relay or a source?
>>
>> 2) Additional comments?
>>
>> 3) Relay recommendations?
>>
>> Thanks
>>
>> Jay
>>
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>>
>>
>>
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