[Hallicrafters] Hallicrafters SX-88

[Jim Liles]

Good morning Greg,

Don’t see any reference to Jays sweep analysis.  I’ll contact Jay and check to see if he swept the band pass.  Seem like there’s only a hand full of folks who have worked on these radios.

Thanks again  --- Kindest regards Jim K9AXN 

-----Original Message----- 
From: Greg Gore 
Sent: Tuesday, July 21, 2015 4:27 AM 
To: hallicrafterssr2000 at k9axn.com ; hallicrafters at mailman.qth.net 
Subject: Re: [Hallicrafters] Hallicrafters SX-88 


Jim, 

There is a good recent report of a comprehensive Hallicrafters SX-88 restoration with follow-up performance test results by Jay Rusgrove; W1VD at:http://www.w1vd.com/HallicraftersSX-88.html  
Jay did measure the SX-88 50KC IF transformer "Q" and it's actually better than we anticipated at 230. The transformers Hallicrafters employed in other models using a 50KC 2nd IF system are not quite like these. Jay also swept the 50KC IF's after a complete electrical restoration and reports the curves do match the original engineering design. 

Regards, Greg Gore
WA1KBQ



-----Original Message-----
From: Jim Liles <hallicrafterssr2000 at k9axn.com>
To: hallicrafters <hallicrafters at mailman.qth.net>; Roy Morgan <k1lky68 at gmail.com>
Sent: Sun, Jul 19, 2015 7:50 pm
Subject: Re: [Hallicrafters] Hallicrafters SX-88


I would like to repeat an information request regarding the 50Kc I.F. system used in the SX-88. -----Original Message----- From: Jim Liles Sent: Thursday, July 16, 2015 7:21 PM To: hallicrafters at mailman.qth.net ; Roy Morgan Subject: [Hallicrafters] Hallicrafters SX-88 I have some questions regarding the SX-88. First have you done a sweep analysis of the 50Kc I.F. system or do you know of someone who has? At this point it appears that nobody has taken the time to sweep that system ---- anybody? Can anyone confirm that the 50Kc I.F. charts in the book are correct? Looking at the design I would expect the shape factor for the system to be close to 2.2/1 which is very close to the crystal filters of that time. Is that a correct analysis? Has anyone measured the Q of the first, second , and fourth 50Kc transformer pairs as well as the third pair? More questions but sure would like to hear from those who have had one on the bench. That radio is probably the most enigmatic of the Hallicrafters bunch. Always wanted to put one through sea trials. Would like to hear both objective as well as subjective opinions and test results. Sounds to be some strong feelings regarding that radio’s performance. Please for the moment put the past aside and help me with this project. Kindest regards Jim K9AXN ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net? List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Hallicrafters mailing list Home: http://mailman.qth.net/mailman/listinfo/hallicrafters Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Hallicrafters at mailman.qth.net? List Administrator: Duane Fischer, W8DBF ** For Assistance: dfischer at usol.com ** This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html