OHR 500 IF Filter

[ Follow Ups | Post Followup | Return to QRP Forum ]


Posted by:  Jerry KD0CA

Posted On:  11/14/03

Subject:  OHR 500 IF Filter

Message Posted:

I am finding my OHR 500 that I bought used has a really wide receive response with the IF filter and the low pass audio filter in the circuit. (It's wider without the LP filter!) The manual says it is 400 Hz wide at -6dB. I can hear up to 3 simultaneous CW QSO's when the bands are busy.

Has anyone successfully modified the 4 pole Xtal IF filter to narrow the skirts? I can clearly hear a CW note starting at about 300 Hz and tuning the VFO, I can still hear it plainly at about 1500 Hz. I think the shape factor must be 3.5:1 or 4:1. Sure wish it was narrower. I am afraid I am spoiled by using my Ten-Tec Paragon.

Is there anything I can do about it, or should I quit whining? I'm considering an add-on audio bandpass filter from Vectronics.

73 and Thanks,
Jerry L. Bartachek KD0CA
Washington, IA


Follow Ups:


Post a Followup

Name/Call:
E-Mail:
Subject:
Message to Post:
Use Fixed Width Font (Useful for lining up columns of data in log sheets)
Link URL:
(This can be a link to a web page or anything else.)
Link Name:
(This is an optional description or title for the URL above.)
Picture:
(This must be the full address of a .JPG or .GIF)
Check this box to receive an e-mail when someone replies to your message


 

[ Posting Rules | Follow Ups | Return to QRP Forum ]