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eHam Forums => Boat Anchors => Topic started by: N4MQ on October 13, 2017, 02:36:23 PM



Title: Contact rating of Leach relay 1507-mx ??
Post by: N4MQ on October 13, 2017, 02:36:23 PM
I wish to get the contact rating of their 300 ohm DPDT antenna relay.  Internet has not given me any leads.

Iam trying to design an antenna heating system for ice in the winter for my loop antenna which is about 1000 feet in length with a power supply. Thank you for your assistance. Woody


Title: RE: Contact rating of Leach relay 1507-mx ??
Post by: N4MQ on October 26, 2017, 04:17:08 AM
Found the answer in a 1946 issue of RADIO CRAFT.  They were for sale for hams and listed at 5 amps at 50 volts DC, strange ratings for what appears to be a wide spaced - 300 ohm antenna relay.?  Woody Enjoy.


Title: RE: Contact rating of Leach relay 1507-mx ??
Post by: N3QE on October 26, 2017, 08:05:01 AM
"300 ohm", is this perhaps a reference to the relay's coil resistance?

I think most HVAC or medium-amp style relays would be good for switching ladder line. Below you can see my ladder line switching relays where I use Deltrol 900-series relays. N6RK, in May 2009 QST Hints and Kinks, explains how to broaden the switching gaps in this style of relay even more.

(http://www.trailing-edge.com/WP_20151206_004.jpg)