[Hallicrafters] S meters

[k6uuz at juno.com]

HI, Mike;

I recommend the AN/URM-25 Signal generator sold by Fair Radio Sales
(www.fairradio.com) for $110. It has a calibrated attenuator. I use mine
all the time and find it very stable and accurate. Good luck.

Ed Richards K6UUZ
 

On Tue, 9 Dec 2003 12:47:46 -0600 "Langston, Mike"
<MLangston at HCPRICECO.com> writes:
> I'm a first-timer on the reflector, so be kind. I need some help.
> 
> 1.	I have S-meters that won't zero (electrically, they're 
> fine
> mechanically). One is on a SX-115 and the other on a SX-117 (I also 
> have a
> similar problem on a 75-A4). I get action from both the "zero" pot 
> and the
> "factory gain" pot but they just won't get the meter low enough. The 
> pots
> have been checked and are correct. I suspect one or more shorted 
> ceramic
> caps in the AVC circuit and that will be the next thing I check 
> (that would
> make the AVC circuit inoperable, correct?).
> 
> 2.	Once I have the S-meter operating properly, I will need to 
> adjust
> the factory gain to get an S-9 reading with the proper input signal. 
> Without
> a $1000 piece of test gear, is there any simple way to measure a 1/2 
> or 1
> microvolt level? My signal generator (Sun Equip) has a variable 
> output level
> but how can I (reasonably accurately) determine what that is?
> 
> Everything else on these two rigs seems to be working properly. They 
> have
> been re-capped and tubes checked (replaced as necessary) but not yet
> aligned. I also haven't checked the tube voltages against the manual 
> in the
> AVC circuit. I will do that when checking the ceramic disc caps in 
> that
> circuit. I'm currently working on the 117 and then will move to the 
> 115.
> 
> Any ideas, tricks or comments would be greatly appreciated.
> 
> Tnx & 73
> Mike Langston
> KL7CD
> mlangston at hcpriceco.com  
> _______________________________________________
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> dfischer at usol.com
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