i have a heath xtal filter for sale best offer. its part no 404-328 and is unused. cf 3395khz 2.1khz at 6db thanks al k2sse Listserver Subscription:listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'" Listserver Submissions: heath at listserv.tempe.gov Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"