[Lafayette] recieve preamps

[Greg Mijal]

Speaking of receiver pre-amps:
Mini Circuit Labs (USA)  makes a very nice line of monoblock rf pre-amps. 
It's the MAR line.  Such as MAR 4, MAR 6 etc. It's a small block of plastic 
with four solderable pins.  The surface mount version is tiny but doable 
with a 30 watt iron.  It's one pin on four sides of the compass so it's hard 
to &$%^ up the solder job.
They can provide up to 20 db of gain and have NF's of 2 - 3 db. Some models 
are good to 2 ghz.
No tuned circuits required just an input and output cap.  DC bypass choke 
and decoupling cap.  Runs on up to 12 vdc. Add a pot in the supply circuit 
to control gain and noise. 12 vdc can be obtained from the 12 v filament 
line, a diode and electrolytic cap of at least 100 uf/ 25 vdc.
I built one of these and put in a Drake TR-4. Wow! Very hot. what a 
difference these little buggers makes.  This thing will probably shoot an 
old Lafayette into orbit. I just bought 5 MAR 6SM's on ebay . A really good 
addition to the boatanchor receiver.
73's
Greg
WA7LYO
Kinston NC

----- Original Message ----- 
From: "manualman" <manualman at juno.com>
To: <lafayette at mailman.qth.net>
Sent: Friday, February 12, 2010 8:19 PM
Subject: Re: [Lafayette] recieve preamps


> Trio made many of Lafayette's amateur and short wave receivers. Other
> then that, there is no association between Lafayette Radio Electronics
> and Trio.
>
> Pete, wa2cwa
>
> On Fri, 12 Feb 2010 18:51:02 -0600 "Chris Boone" <Cboone at earthlink.net>
> writes:
>> I thought Trio was Kenwood's other name; not Lafayette's...
>>
>> > -----Original Message-----
>> > From: lafayette-bounces at mailman.qth.net [mailto:lafayette-
>> > bounces at mailman.qth.net] On Behalf Of bonddaleena at aol.com
>> > Sent: Friday, February 12, 2010 2:22 PM
>> > To: lafayetteradiocollectorsclub at yahoogroups.com;
>> > lafayette at mailman.qth.net; boatanchors at mailman.qth.net
>> > Subject: [Lafayette] recieve preamps
>> >
>> >
>> > Hi, I just wanted to mention this 'tidbit' to those of us that
>> collect
>> Lafayette
>> > radios. I have many (all restored) and I feel that 'bang fer the
>> buck',
>> the
>> > Lafayette (Trio) radios can't be beat. No, they are NOT a Collins
>> or a
>> Drake
>> > R8B, but they don't cost a Kilobuck, either......
>>
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>
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