I just installed it in the same way that the old mixer was in. The
reason to leave it as it came is so the receive input goes to the IF
port which is DC to 200 mhz and the receiver works all the way down to almost
0 mhz. By the way Vari-L was bought by Sirenza Microdevices which
has since sold to a company called RFMD.
73, Joe, KC9LAD.
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From: "Jim Shorney" <[email protected]>
To: "[email protected]" <[email protected]>
Date: Sat, 31 Jan 2009 12:24:41 -0600
Priority: Normal
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Subject: Re: [Drakelist] Drake Part Needed
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Great stuff, Joe! Thanks! The next question is, did you install the
SRA-3H as MCL intended, or did you keep the Drake hookup where the RF
and LO ports were swapped?
73
-Jim
On Sat, 31 Jan 2009 12:33:49 -0500, Joe Pyles wrote:
>I don't have any hard numbers but the receiver seems more sensitive
>and quiet. In the datasheet for the SRA-3H the performance graphs
>show it with +14 dbm, +17dbm, and +20 dbm and the performance
>is almost identical. I called Mini-Circuits when I bought the SRA-3H
>and talked to one of the engineers and he recommended this mixer as
>it has 8 schottky diodes in it as opposed to 4 diodes in the level 13
>mixer. he said that this would make it less susceptible to overload
>from strong signals. He said that if the mixer actually was operating
>with +13 dbm instead of +17 dbm the only thing that I would even notice was
>about a 0.5 db higher conversion loss. On 10 meters at 28.500 with a
>known good up converter board the calibrator would give exactly an
>s9, with this board with the SRA-3H the calibrator gives about 5 db over s9.
>
>
>http://www.minicircuits.com/pdfs/SRA-3H+.pdf
>
>73, Joe, KC9LAD.
>
>
>
>At 09:30 PM 1/30/2009, you wrote:
>>On Fri, 30 Jan 2009 00:25:59 -0500, Joe Pyles wrote:
>>
>> >In my TR7A I have a Mini-Circuits SRA-3H. It is a level 17 mixer.
>> The TR7 brochure entitled "The Technology of Our Times" by Ron
>> Wysong stated that the TR7 has +17 dbm LO.
>> >so I choose this mixer. I believe the receiver is actually a
>> little better than with the original Vari-L mixer.
>>
>>
>>So which is it really, +13 or +17? Has anyone empirically measured the
>>LO level? Joe, do you have any hard numbers on the performance of the
>>SRA-3H?
>>
>>73
>>
>>-Jim
>>
>>
>>--
>>Ham Radio NU0C
>>TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A,
>>GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time!
>>
>>HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
>>http://radiojim.exofire.net
>>http://incolor.inetnebr.com/jshorney
>>http://www.nebraskaghosts.org
>>
>>
>>
>>_______________________________________________
>>Drakelist mailing list
>>[email protected]
>>http://mailman.zerobeat.net/mailman/listinfo/drakelist
>
>
--
Ham Radio NU0C
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A,
GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time!
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://radiojim.exofire.net
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org
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