[R-390] What is the difference between 390 and 390A

[Bob Camp]

Hi

Obviously item number 4 is a prerequisite. We *never* get rid of 
radios, we just keep adding to the pile.

	Enjoy!

		Bob Camp
		KB8TQ


On Apr 11, 2005, at 4:34 PM, ROBERT YOUNG wrote:

> I'd like to thank all of you for taking the time to answer my 
> questions of
> which I'm sure I'll have plenty more in the next months. You've helped 
> me to
> decide which one to buy:
>
> 1. 390
> 2. 390A
> 3. SP-600
> 4. keep my HQ-180
> 5. many others.
> haha!
>
> Bob Young
>
>
>
> ----- Original Message -----
> From: "Damon Raphael" <w7md at comcast.net>
> To: "ROBERT YOUNG" <youngbob53 at msn.com>
> Cc: <r-390 at mailman.qth.net>
> Sent: Monday, April 11, 2005 3:08 PM
> Subject: Re: [R-390] What is the difference between 390 and 390A
>
>
>> Hello Bob,
>> I use a HQ-180, R390 and R390a.
>> The 390 radios have more accurate frequency readout, to start. This is
>> not surprising since they cost a fortune in 1950s and 1960s dollars 
>> when
>> they were manufactured. They have the best freq readout of probably 
>> any
>> non digital radio ever made.
>> The 390 and 390a have the ability to listen to "wider" signals which
>> means better audio fidelity when you want to listen to broadcast 
>> music.
>> What the HQ-180 has, that the 390s don't, is a tunable notch filter.
>> I use the Hammarlund mainly for SWL and the 390s for ham radio. The
>> mechanical filters in the 390a are more effective for rejecting
>> interference than the LC filters in the 390, but may give somewhat
>> poorer quality audio fidelity at the same bandpass width.
>> The R390 may be a little more sensitive than the 390a. It has an extra
>> stage of RF amplification but this probably doen't really make much
>> difference as both radio are very sensitive; otherwise, the Collins
>> engineers wouldn't have removed the extra stage in the redesign to 
>> make
>> the 390a.
>> If you get a 390 or 390a, then you will have a considerable expense in
>> getting it restored to its original operating specifications. There 
>> are
>> only a few people who know enough about these radios to properly 
>> restore
>> them.
>> Hope thmis helps,
>> Damon Raphael, W7MD
>> Tucson, AZ
>>
>>
>> ROBERT YOUNG wrote:
>>> Hi,
>>>
>>> I'm new here, I'm a BCB dx'er and plan on buying a Collins within the
>>> next
>>> year and was recommended to come here for help by a fellow member of 
>>> the
>>> NRC. I'll probably have a lot of questions and my first one is what 
>>> is
>>> the
>>> difference between the 390 and the 390A? Which would be better for 
>>> BCB
>>> DXing? Also I use a nice HQ-180 right now, can anyone compare the two
>>> for
>>> me? thanks,
>>>
>>> Bob Young
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>>
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