[Premium-Rx] WJ 8716 and WJ8718 HF

[L.D. Ritta]

Is your email address correct as I tried sending you an email and got fatal
errors.

Lee

 

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From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of stephous
Sent: Monday, 14 August 2006 3:11 AM
To: Geoff Greer; premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] WJ 8716 and WJ8718 HF 

 

Geoff,

 

Thanks for the clarification. My preselector card is 794095-1, 20 to 30 MHz
filter No. 1 (-1 penciled in). My EPROM's are all HF option. I will modify
filter No.1 as soon as I find the least destructive method.

 

Having no preselector below 30 MHz could be an issue for AM broadcast
images. Probably not a big deal. An external trap would take care of that.

 

One of my radios tunes from 0 to 1100 MHz. Hmmmmmmmmmm? The preselector card
is also a 794095-1. It seems that cards were changed in these radios
frequently. Many of them have options that were disabled. The option
stickers don't always indicate what's really inside the box.

 

Best Regards,

Steve

 

PCS Associates
949 Glenneyre Street
Laguna Beach, CA. 92651-2706
Phone: (949) 376-7844
FAX: (949) 376-7866
http://www.pcsassociates.net/

----- Original Message ----- 

From: Geoff Greer <mailto:greer86 at attglobal.net>  

To: stephous <mailto:stephous at att.net>  ; premium-rx at ml.skirrow.org 

Sent: Sunday, August 13, 2006 5:07 AM

Subject: Re: [Premium-Rx] WJ 8716 and WJ8718 HF 

 

The card for the HFE option is a 794095-2.  They modified the filter # 1 to
cover 2 - 30 MHz.  See appendix K in the option book for details. The
performance your describing describes the non option card very well. WJ made
a -3 version of the card that replaced filter #1 with a .1 ufd capacitor.
This one was used in the -5 version and maybe others.  Downside here is no
preselector below 30 MHz.  This mod works very well.

 

Geoff Greer 

Amadeus Surplus

----- Original Message ----- 

From: stephous <mailto:stephous at att.net>  

To: premium-rx at ml.skirrow.org 

Sent: Sunday, August 13, 2006 1:20 AM

Subject: [Premium-Rx] WJ 8716 and WJ8718 HF 

 

Several of the WJ 8617/18 radios that I recently acquired are marked HFE and
tune down to 2 MHz. The HF Eproms are installed in the 1st LO. The radios do
not receive signals below 18MHz even though they tune down to 2 MHz. Gain
drops off sharply. I'm assuming that the filters were changed at some point.
I have been told that there is a filter jumpering procedure to restore HF.

 

I have one of the 8618Bs on the bench. I pulled the low band filter board
A3A4 and I'm trying to figure out how to jump it for HF. Do you jump L9 or
the entire stage from L9 to L5? I have an 8617B-(S1) with HFE but it's
bolted in the rack. It would be nice to figure this out without dismantling
that radio.

 

I have the manuals. How do you restore full coverage?

 

Thanks,

Steve

 

 

PCS Associates
949 Glenneyre Street
Laguna Beach, CA. 92651-2706
Phone: (949) 376-7844
FAX: (949) 376-7866
http://www.pcsassociates.net/


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