SB-301 and SB-610 question

[Stephen Finch]

The manual says that for frequencies up to 1 khz, use at 12 pf., for 1.6
khz to 2.5  khz, use 2.2 pf. and for frequencies above 3 khz, use 1.0
pf.  You can use more capicatance if the deflection is too low, however,
the receiver IF may need retuning because of the loading.

The manual also says that for IF's above 3 khz, it may be necessary to
connect a 15k ohm, 1 watt resistor from lug 1 to lug 2 of coil L1.  Then
you will need to readjust L1 and L2 in the 610, and the receiver IF.

Steve
AIØW

Mark V. Johnson wrote:

>I have SB-610's on my SB-300, SB-301, SB-102 and all have great signal deflection or gain. Can't recall the cap value Heath recommends for coupling but it seems to me I use around 3 to 6 pf. As for "alignment" of the SB-610 IF amp, I just peak the top and bottom coil slugs for max signal display. Also, I recall that for the 3395 IF frequency, there is another coil in the SB-610 that needs to be peaked. Not sure as I don't have the manual in front of me. In short, all (SB-300/301/102 etc.) have enough drive to "fill the screen" on the scope. You may have an amplifier problem in the scope. Weak tube, low voltage etc. Those scopes work very well in that application.
>
>Mark V. Johnson VE3DJU/VE3DDI
>
>
>>From: Mark Graalman WB8JKR <wb8jkr at JUNO.COM>
>>Date: 2003/09/22 Mon AM 05:23:24 EST
>>To: HEATH at LISTSERV.TEMPE.GOV
>>Subject: SB-301 and SB-610 question
>>
>>  I have a friend who has a SB-301 receiver and uses the SB-610
>>monitor scope with it. His complaint is the apparent lack of deflection
>>on the 610 with signals of "typical" signal levels. It seems in order to
>>get good deflection on the 610 he needs to have the AGC on the 301
>>turned off. He's measured the input signal level verses deflection
>>sensitivity of the 610 and its pretty close to Heath's specs of
>>500mv/inch
>>deflection at 3395 KHz. I've had his SB-301 here and I'm convinced his
>>301
>>is working to spec.
>>He has used low capacitance cable between the 301 and the 610, he has
>>used the recommended size of coupling capacitor in the 301 AND has tried
>>increasing it as well. The I.F. strip tuning was checked after
>>installation etc.
>> The 610 has the correct setup in place for use with the 3395 I.F. and
>>its alignment has been checked.
>> Our question is, is it normal for this scope/receiver combination? It
>>seems
>>like complaints of low scope deflection would have been heard before if
>>this were
>>the case but nothing is found in the list archives. Anyone who has used
>>or is using
>>a 301/610 setup, what kind of deflection/signal verses signal strength
>>performance
>>do you get?
>>
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>>
>
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--
Stephen C. Finch

28289 Fireweed Drive
Evergreen, CO  80439

Tel:   303-679-1009
Fax:  303-679-1045
Email:  stevef88 at earthlink.net

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