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 Post subject: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 12:22 am 
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Joined: May Thu 09, 2019 12:06 am
Posts: 155
Location: North Carolina
This radio is supposed to be restored. I can see the filter cap can has been replaced. Would have to take it apart to see what has been done under the chassis. AM picks up fine other than noise near the higher end of the band. 4-8MC picks up plenty in the evening time with a lot of noise near the low end of the band. 2-4MC is nothing but noise and the meter bands are totally silent. What could be going on here? Im new to all this.


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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 2:50 am 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 26231
Location: Annapolis, MD
Assuming that all high-risk caps** have been replaced, the first thing I would check is the bandswitch. These need to be carefully cleaned and checked---I normally remove them to do this. (One reason being that it makes it easier to get to some caps that need to be replaced.


** High risk includes all electrolytics and paper / wax. Mica and ceramic are typically OK, but there are exceptions. Often a useful rule is---if you are uncertain, just replace.

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 3:01 am 
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Joined: May Thu 09, 2019 12:06 am
Posts: 155
Location: North Carolina
Would checking the bandswitches be a tough job for a novice like me?


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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 3:15 am 
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Joined: Jul Mon 26, 2010 8:30 pm
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Location: Annapolis, MD
Well.....we don't know what kind of novice you are!!....:)

Can you give us some hints---eg basic knowledge of electricity, use of various kinds of tools, including general-purpose electrical meters, experience with soldering, etc.----What kinds of things have you built or fixed?

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-Mark
"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 3:19 am 
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Joined: Jan Sun 06, 2008 3:28 am
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Location: Richmond, VA
Download this H500 restoration guide. There is a section on cleaning the band switches. Shortwave bands use the telescoping Waverod antenna. Make sure it is extended and plugged in at the back.

http://elmphotography.com/pdf/H500%20Restoration%20Guide.pdf

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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 5:32 am 
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Joined: May Tue 30, 2006 4:46 pm
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Location: Santa Rosa, CA
Quote:
4-8MC picks up plenty in the evening time with a lot of noise near the low end of the band. 2-4MC is nothing but noise and the meter bands are totally silent. What could be going on here? Im new to all this.


Due to sunspot cycle, you won't hear much above 10 MHz, especially not at night. May not be the radio... just poor propagation.

Can you hear WWV at 10.0 MHz.? It sure be good into the early evening.

Rich


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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Thu 09, 2019 1:15 pm 
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Joined: Jun Wed 08, 2011 2:33 am
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Location: Ohio 45177
I agree, some of the higher SW bands are pretty dead due to low sunspots. You could check reception with a signal generator or something, but you will probably hear stuff above 10 during daytime. The 2-4 range is affected by local noise sources like AM band, and you will not hear much there in the day. Evenings some loud religious SW BC in the 3-4 range and hams are 3.5 to 4 in evenings. But 95% of them are not using modes your receiver can use. Your receiver could have issues but the 11 year sunspot cycle determines alot of what you can pick up and also shortwave broadcasting is largely in decline except for China.

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 Post subject: Re: Dead bands on Zenith H500
PostPosted: May Fri 10, 2019 12:41 am 
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Joined: May Thu 09, 2019 12:06 am
Posts: 155
Location: North Carolina
Im not an electronics guru but have to learn somehow. Havent picked up WWV with it but picked up CHU along with plenty of stations from Cuba plus some Morse code and one station that makes a bunch of wild sounds!


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