[ARC5] RME As Aircraft Radio (?!?)

[Richard Knoppow]

----- Original Message ----- 
From: "Geoff" <geoffrey at jeremy.mv.com>
To: <Arc5 at mailman.qth.net>; "MWM" <military1944 at aol.com>
Sent: Thursday, November 15, 2012 12:48 PM
Subject: Re: [ARC5] RME As Aircraft Radio (?!?)


> Subject: Re: [ARC5] RME As Aircraft Radio (?!?)
>
>
>>
>>
>>
>>> There's a very nice example of the 1935 RME-69 receiver 
>>> and RME DB-20
>>> preselector
>>> now on ebay at http://www.ebay.com/itm/400329273964 .  A 
>>> bit pricey, I
>>> think.
>>>
>>
>>
>> ---------------------------------
>>
>>
>> I have a nice example of the rx and preselector. I really 
>> must try them
>> out one day.
>
>> Ben G4BXD, GB0MWM
>
> The RME-69 is a prime example of how not to design a radio 
> if you want good
> performance over its full tuning range. With only one RF 
> stage it still
> needs help above 14 MHz and the sales literature suggested 
> 2 more stages
> from the DB-20 to amplify even more noise and reduce 
> strong signal handling
> ability.
> The major reason for the poor performance is almost no 
> padder and trimmer
> adjustments plus rats nest wiring resulting in low gain 
> and a higher noise
> figure than a lot of its competition.
>
> Put it alongside a HRO, NC-100XA, NC-101X, or other 
> contemporary radio.
>
>
    National stuff was built to very superior standards. 
Its also obvious that the HRO was well ahead of its time in 
design.  The use of a pentode rather than a pentagrid or 
hexode as mixer would result in significantly lower noise.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com