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#26 2011-11-28 17:03:30
- ssbothwell
- Member
- Registered: 2011-09-24
- Posts: 10
Re: Mixer - Double Balanced Diode Ring
i removed the transformers and checked the diodes. they seemed to be fine. i then rewound the transformers with new enamel wire and reattached them carefully. i still have the same results.
with 3.5MHz on the LO and approximately 8.5MHz on the RF ports i see this on the IF port: http://i.imgur.com/ioBpv.jpg
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#27 2011-11-30 05:42:54
- W8DIZ
- Administrator
- Registered: 2008-08-12
- Posts: 314
Re: Mixer - Double Balanced Diode Ring
Sol...I sent you a built diode ring mixer in your last order.
Use it to compare your built kit...then send it back 
-Diz
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#28 2011-11-30 22:06:46
- ssbothwell
- Member
- Registered: 2011-09-24
- Posts: 10
Re: Mixer - Double Balanced Diode Ring
oh wow. thanks so much diz.
i'll send it back as soon as i can troubleshoot my kit.
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#29 2011-12-01 20:35:06
- ssbothwell
- Member
- Registered: 2011-09-24
- Posts: 10
Re: Mixer - Double Balanced Diode Ring
hi diz. i feel really dumb. within a minute of looking at your diode ring mixer i realized what was wrong with mine. i forgot to install a jumper in place of R5. i have no idea how i missed that! i tested it out and it is working perfectly now. i'll send your mixer back when i get a chance to stop at the post office in the next day or two.
thanks for everything.
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#30 2011-12-02 06:51:30
- W8DIZ
- Administrator
- Registered: 2008-08-12
- Posts: 314
Re: Mixer - Double Balanced Diode Ring
No hurry on returning the PCB.
A picture is worth a thousand missing jumpers
On second thought...I do not see why R5/jumper would make much difference in the output/balance ?
http://kitsandparts.com/minikits/drmsch.gif
-Diz
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#31 2012-12-22 11:15:07
- w4hbk
- New member
- Registered: 2012-12-22
- Posts: 1
Re: Mixer - Double Balanced Diode Ring
Hi, Diz. How does the the DBDR compare to the SBL-1 with respect to IP3? I'm thinking about replacing the SA612 in my N3ZI rx with ur DBDR to eliminate or at least reduce the overload problem. I have ur RF Amplifier Kit to add somewhere if the lost gain in the 612 is needed.
73 bill w4hbk
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#32 2012-12-23 03:57:31
- W8DIZ
- Administrator
- Registered: 2008-08-12
- Posts: 314
Re: Mixer - Double Balanced Diode Ring
w4hbk wrote:
Hi, Diz. How does the the DBDR compare to the SBL-1 with respect to IP3? I'm thinking about replacing the SA612 in my N3ZI rx with ur DBDR to eliminate or at least reduce the overload problem. I have ur RF Amplifier Kit to add somewhere if the lost gain in the 612 is needed.
73 bill w4hbk
Hi Bill,
I do not have any numbers on my diode ring mixer; don't have the equipment...but
one has the option to optimise the toroids for the frequency of use.
I would put money on it that my mixer is as good or better than a typical SBL-1
I would add an RF amp to the ouput of the mixer to compensate,
that way you retain the +14 dB gain
73, Diz, W8DIZ
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