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President Washington 858 pll

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385
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President Washington 858 pll

Post by 385 » Thursday, 14 May 2009, 16:31 PM

Have a Pres.Washington base with the 858 pll and have almost no RX on AM but best I can tell has good RX on SSB but haven't checked very well since there aint no local SSBer's here.
Also have a Dwight D that if you don't have the mic hooked up you have no RX but it don't make any differance with the Washington.
Done the power adjustments VR 7, VR 8, and CT 7 and I'm not getting but 5-6 DK and very little swing and only 6-7 watts on ssb.
Any idea's??? Thanks 385
385, Tracy




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Re: President Washington 858 pll

Post by 385 » Sunday, 17 May 2009, 21:17 PM

bump.... Anybody???
385, Tracy



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Re: President Washington 858 pll

Post by TheCBDoctor » Monday, 18 May 2009, 9:34 AM

Hi 385,

The Dwight D is probably a 5 pin which makes it a different chassis than the Washington. The Washington has a relay and does not not need a microphone to hear the audio. The newer version of both radios need a microphone to hear the receive.

The dead key should be between 5 to 6 watts; that is the maximum carrier it will put out. Are you using a peak reading meter?
If the meter is an average reading meter the results you are getting are normal.

As for the receive the AM and the SSB go to two different circuits after the mixer. If you have SSB receive, but no AM receive, then the problem is in the AM portion of the circuit. Check the 455 KHz filter.
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Re: President Washington 858 pll

Post by 385 » Monday, 18 May 2009, 10:56 AM

Thanks CB Doctor, The Dwight D is a 4 pin but the rest of that I'd have to get back to ya on.
My meter is a dosy 4001P
How would I go about checking that filter? What do I check for? Thanks 385
385, Tracy



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Re: President Washington 858 pll

Post by silverstreak » Monday, 18 May 2009, 12:56 PM

Check the 10Volt caps or any caps in the RX section.
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Re: President Washington 858 pll

Post by TheCBDoctor » Monday, 18 May 2009, 18:33 PM

Hi 385,

Without a schematic and test equipment it may be hard to repair. Let me look up Sam's Photo Facts and I will try and give you some direction. The 455 Khz ceramic filter is usually a small black block with 3 or 4 leads coming from it. It says 455 on it. Before I go any further let me make sure that the radio has a dual conversion receiver.

The Cobra 2000 GTL does, but I can not recall off hand if the 139 XLR uses that filter. They do go bad, but usually in the mobile version because of vibration; such as, in the Cobra 148 GTL.

Have you confirmed if the radio is receiving properly on SSB and not on AM?
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Re: President Washington 858 pll

Post by Black Lightning » Tuesday, 19 May 2009, 0:33 AM

TheCBDoctor wrote:Hi 385,

Without a schematic and test equipment it may be hard to repair. Let me look up Sam's Photo Facts and I will try and give you some direction. The 455 Khz ceramic filter is usually a small black block with 3 or 4 leads coming from it. It says 455 on it. Before I go any further let me make sure that the radio has a dual conversion receiver.

The Cobra 2000 GTL does, but I can not recall off hand if the 139 XLR uses that filter. They do go bad, but usually in the mobile version because of vibration; such as, in the Cobra 148 GTL.

Have you confirmed if the radio is receiving properly on SSB and not on AM?
The 139XLR is single conversion on all modes and does not have the 455 filter.
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Re: President Washington 858 pll

Post by 385 » Tuesday, 19 May 2009, 6:38 AM

HI Doctor
IMO the washington receives fairly well on ssb. I did talk a little skip on it two days ago but only one contact,But I can switch to AM and on 19 can here for about a couple miles. Its like the RF gain is turned way down.
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Re: President Washington 858 pll

Post by TheCBDoctor » Tuesday, 19 May 2009, 7:16 AM

Hi 385

The radio has a single receiver for both AM and SSB. It is unusually for the SSB to have good receive and the AM to receive poorly. In most dual conversion receivers the AM fails because of the second IF circuit. I will look at the schematic by this evening and see what is in the AM receive circuit that may have a problem that will not affect the SSB.

The 858 chassis is a complicated radio unlike the MB 8719. There are separate sections for each mode for SSB and AM for the 858 chassis. I will provide more details after I look over the service manual. Ten volt decoupling capacitors tend to fail. That is where I would normally start, but it has to be specific to the AM receive section if Sideband receive is fine.

I will get back to you.
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Re: President Washington 858 pll

Post by cherrypicker » Saturday, 25 December 2010, 3:01 AM

What ever happened on this? I picked up the same radio with a similar issue. But its low recieve on both am & ssb.


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