It's a VHF PIN diode with very low junction capacitance. I have to believe Drake used this diode for a reason. I'm not sure in what part of the circuit it's broken, but if it's in an up-conversion area, then I would definitely try to stick with the original part number or an equivalent (e.g., MPN3700).
It looks like an obsolete part now, but I see a few for sale at reasonable prices at the big on-line auction site. Paul, W9AC ----- Original Message ----- From: E VICKNER To: [email protected] Sent: Monday, July 05, 2010 12:14 PM Subject: [Drakelist] MPN3404 Diode on Filter Board of TR7 I picked up a TR7 yesterday at a hamfest. Upon opening the radio up I noticed that one of the MPN3404 diodes on the filter board had a broken lead. Is there anything special about the use of this particular diode of the filter board or can I substitute a general purpose switching diode for the broken one? Tnx & 73 Ed K2ZE ------------------------------------------------------------------------------ _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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