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  2. Radiolab filter mod for M37V ULR

Re: Radiolab filter mod for M37V ULR

Steve Ratzlaff <steveratz@...>
 

Hi Mike,
Just for clarification, the LTS450GW filter that Radiolab uses is a specified 9kHz bandwidth filter, not 4.5 kHz--one has to read the spec closely--it says "+/-4.5 kHz". That's a pretty wide filter. It's a 6 element filter so apparently that better selectivity is what makes the difference in your M37 ULR. As with the LTM450xx series of YIC brand that the UK eBay Mainline seller carries, the H version is listed as a 6 kHz filter. I've measured it at 7.85 kHz so it's wider than the spec. I would guess it doesn't matter much who actually makes the filter--Eurocquartz (who probably really gets it from Asia), or the YIC brand.
Since I can get the H version from Mainline, there's not much point in me trying the Euroquartz G (wider) version. Too bad we can't get the I version which is the narrowest one listed.
But thanks for the Radiolab info!
73,
Steve

----- Original Message -----
From: "m_a_schuster" <schuster@...>
To: <ultralightdx@...>
Sent: Sunday, April 12, 2009 3:48 PM
Subject: [ultralightdx] Re: DT-400W filter mod results comments


Steve,

Yep, I don't know of any suppliers that will sell single quantities of these Euroquartz filters. In separate threads on the Sony SRF-M37 some had purchased the 4.5 KHz version directly from Radiolabs as they use this series to upgrade the large ATS-909 portable. (In my case I asked Todd D. if they would install it for me, and he said sure) The skirts look pretty good for a tiny ceramic; at least, if the graphs on the spec sheet are to be believed.

On further reflection I wonder whether this series would actually fit in the DT-400 cabinet, though.

regards -- mike


--- In ultralightdx@..., "Steve Ratzlaff" <steveratz@...> wrote:

Hi Mike,
No, I wasn't familiar with that brand or type of filter, nor where to obtain
it, so I have no firsthand info on how it performs. Only the YIC brand of
filters that the UK eBay seller Mainline carries is all I've tried.
73,
Steve

----- Original Message -----
From: "m_a_schuster" <schuster@...>
To: <ultralightdx@...>
Sent: Sunday, April 12, 2009 3:00 PM
Subject: [ultralightdx] Re: DT-400W filter mod results comments


Steve,

Did you ever get the opportunity to test the Euroquartz LTS450GW4.5 KHz
filter which Radiolabs is selling? They just installed one in my SRF-M37 and
the selectivity improvement here in RF Hell is quite impressive. Wondering
if this might be a more effective mod for the Sangean DT-400.


--mike


http://www.euroquartz.co.uk/pdf/ceramic-lts-450w.pdf



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