[Lowfer] First Impressions: AMRAD Converter and Lowpass Filter

[jrusgrove at comcast.net]

That said...I'm not exactly sure what performance parameters I'd be 
looking to compare.

The usual tests ... same as for a receiver ... MDS, 1-dB compression, 2-tone IMD and phase noise. 

Jay W1VD  WD2XNS  WE2XGR/2




----- Original Message ----- 
From: "Ben Hall" <kd5byb at gmail.com>
To: <lowfer at mailman.qth.net>
Sent: Wednesday, February 04, 2015 4:59 PM
Subject: Re: [Lowfer] First Impressions: AMRAD Converter and Lowpass Filter


> On 2/4/2015 2:08 PM, Douglas D. Williams wrote:
>> Hi Ben. Looks like JD and Zack got your 530 kHz situation sorted out.
> 
> Absolutely.  I wanted to play with the converter again last night but 
> just did not get around to it.
> 
>> Given my correspondence with Todd, I would advise replacing that RG174
>> between your LPF and converter. If you do have some spare LMR-195, that
>> would be ideal, IMO.
> 
> Even better - I found some LMR-240 and appropriate connectors.  I should 
> be able to install it this evening.  I'll probably replace the RG-174 
> that delivers the 3 MHz from the OCXO as well.
> 
>> I happen to have a spare Todd Roberts converter. Would be interested to see
>> if anyone would be interested in doing some performance measurements
>> comparing the IC that Ben used with the original AMRAD IC.
> 
> I have at least one more of my custom printed circuit boards for the 
> converter.  I have thought about building a second converter using the 
> SOIC variant of the 74HC4053 chip so I could compare it with the 
> 74LVX4053 version.
> 
> That said...I'm not exactly sure what performance parameters I'd be 
> looking to compare.  If folks could suggest some tests/test setups, I'll 
> see if I've got access to the equipment I need to conduct them and build 
> up the second unit with the 74HC4053.
> 
> thanks much and 73,
> ben, kd5byb
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
> Post must be less than 50KB total for message plus attachment!
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html