Re: Connecting Sony SRF-XX to outdoor antenna for improved FM reception?
Bruce,toggle quoted messageShow quoted text
Very helpful and detailed answer.
- The SRF-S86 indeed has the CXA1129N IC.
- The SRF-S86 out of the box has excellent FM sound quality and is quite good as a DXer. My properly aligned c.1977 home tuner with an external Yagi is obviously better on all fronts but this Sony is really a pleasure to listen to, especially with fresh batteries.
- The SRF-S86 does not have a Local/DX switch (it was factory wired with the the stereo/mono option)
- Could you help me with the following, "you can probably soup up your walkman just by removing that wideband filter, and running a separate wire directly to the tuning capacitor side of the ceramic filter. The connections should be very obvious (?)"
- It might be helpful to see the service manual for the similar Sony SRF-80 in PDF form (click - get manual) is found at this link:
---FYI, I believe that switch can be rewired from a stereo/mono to a Local/DX via a straight jumper out of pin 13 from the IC--bottom of this page - http://www.fixup.net/tips/srf49/srf49.htm
Thanks again Bruce - I really look forward to sharing how this runs with a decent Yagi which is over 50 feet high (albeit in a densely populated area with plenty of buildings).
--- In ultralightdx@..., "Bruce Carter" <rbrucecarter@...> wrote:
I would like to connect my Sony SRF-86 to the home external antenna to improve FM reception.Sony has two types of walkman radios. One based on conventional superhet architecture, and the other based on their proprietary CXA1129 IC. The conventional superhet is very prone to overload. The CXA1129 based not nearly so much so. From the looks of the SRF-86, I can see you might be lucky and have a CXA1129 model. If so - it is like the SRF-59 and a little DX machine in a very reasonable package! The CXA1129 IC has a bit of RF gain, something not usually found in a two gang tuner, and the equivalent of three ceramic filter IF - where most only have one. So - it has potential.Radio - It looks like the 3.5mm TRS jack sleeve (outer ring) is the ground and can be used for an external antennaYes, you are correct, the outer ring is the antenna. Also note that the SRF-83 referenced in the article is a CXA1129 based unit, and therefore able to handle the added signal from an external antenna.