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42204

Re: SB-300 X'tal problem

Yes! The 8421 works good and is easier to handle because of the flexibility, but that RG62U just cant be beat for performance on connecting those radios. Lou
Lou Everett, Sr.
6:16 PM
#42204
 
42203

Re: SB-300 X'tal problem

I have tried it with 58, 59, and 62. Let me tell you: 62 was the way to go and remains the only way to go. Take the time and make the effort to get yourself
Lou Everett, Sr.
6:05 PM
#42203
 
42202

Re: SB-300 X'tal problem

Hi Joe, RG-62 IS 93 Ω and 13.5 pF per foot. RG-58 is 50 Ω and about 30 pF per foot. From my experience the cable length is a bit critical. I tried to stick
bob_af6c
6:02 PM
#42202
 
42201

Re: SB-300 X'tal problem

I believe The RG62U Cable is about 93 Ohm, if my memory serves me correctly. I probably should have looked it up, but, I am pretty sure it is about 93 Ohm.
Lou Everett, Sr.
6:00 PM
#42201
 
42200

Re: SB-300 X'tal problem

RG-62 is 93 ohms.  It is also used by Drake receivers/transmitters when connected for transceiving.   A number of Drake owners use Belden 8421 Audio
Ken, WA2LBI
5:32 PM
#42200
 
42199

Re: SB-300 X'tal problem

Thanks to all for the RG wire specs.  It's not imperative that I get this going right away.  To do it right, I'll be ordering up some RG-62.  Thanks again.
Joseph Devonshire
5:28 PM
#42199
 
42198

Re: SB-300 X'tal problem

Correction, RG-59 is spec’d at 16.3 to 20.4 pF, depending on the dielectric. The lower capacitance is for the foamed dielectric. 20.4 pF applies to the
Gary Appel
5:20 PM
#42198
 
42197

Re: SB-300 X'tal problem

RG-58 is 50 ohm coax. RG-62 is 90 ohm coax. But the important part is the capacitance per foot. The RG-62 has a lower capacitance per foot. The 24" is a bit
Bob Macklin
5:18 PM
#42197
 
42196

Re: SB-300 X'tal problem

RG-62 is specified as 93 ohms. More importantly perhaps, 13.5 pf per ft. RG-58 is 50 ohms, 24 pF per ft. RG-59 is 75 ohms, 16.3 pF per ft. (ARRL handbook,
Gary Appel
5:16 PM
#42196
 
42195

Re: SB-300 X'tal problem

RG-62U is critical. Those cables are also used on Hallicrafters pairs. As I recall, the RG-62U is not a 50 or 75 ohm impedance. Read carefully. It WILL work
Bernie Arcand
5:03 PM
#42195
 
42194

Re: Heathkit Sb 102 Failing R940

Ok good news and bad. It's lives! Again! It was the tube 6CL6 which was supposed to be tested by the seller. They are going to get one hell of a bad message
Hunter Baumgartner
4:52 PM
#42194
 
42193

Re: SB-300 X'tal problem

Hi Bob and Bob, I was using some stereo cables.  That was the first blunder.  Now, how critical is RG-62/U v. RG-58?    The SB-300 manual calls for cables
Joseph Devonshire
4:42 PM
#42193
 
42192

Re: SB-300 X'tal problem

The cable capacitance is killing the oscillator! Re-adjust the oscillator per the manual. Get done on the slow side. If it still dies when you connect the
Bob Macklin
2:28 PM
#42192
 
42191

Re: SB-300 X'tal problem

Hi Bob, I double checked when I cabled things between the SB-400 and the SB-300.  But, as we got going with checking this and that, I thought, why not try the
Joseph Devonshire
2:17 PM
#42191
 
42190

Re: SBA-300 6 meter converter

Yep. You have it all correct. Thanks for taking it off my hands. I have no reason to think that after you clean off the outside and pop in a crystal you
RAY FRIESS
12:26 PM
#42190
 
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