digital display for $10.00


Gary DeBock
 

Ron and Others,
 
     I had the chance to view John's SRF-39FP digital display (from aade.com) in action, this week at Grayland, Washington. It was very impressive, but when the $$ are added up, it may not make much sense to purchase it, except perhaps as a curiosity.
 
     For domestic DXing purposes, the SRF-59/39FP analog family of units provide tremendous "bang for the buck," but not when combined with a $69 add-on accessory.  I'm sure John would agree with me that a better solution would be to purchase a digital E100 or DT-200VX, and save the cost of the digital conversion.  Either of these units can be purchased for less than the cost of converting an analog SRF-39/59 unit.
 
     For split-frequency DXers, the SRF-39/59 family of units is easy to modify for increased sensitivity, but their bizarre IF makes conventional narrow IF filters useless, and useful selectivity mods have yet to be designed.  On the other hand, the digital Ultralights (with their 450 and 455 kHz IF's) can all be modified for increased selectivity AND sensitivity.
 
                                                                            73,  Gary 
 
 
    




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John H. Bryant <bjohnorcas@...>
 

Ron,

Thanks very much for bringing this display to our attention. Its very interesting.  I was likely the one that mentioned that I'd added a digital display to an SRF-39.  I've got an article about 2/3 done and will be posting it early in the week. The N3ZI unit turns out to be a partial kit for $10... a very good deal for some folks.  A full kit with all parts is $30.00. It looks great and I'll bet that it works great on the receivers listed and a bunch of others.  I'll guarantee, though, that it will not work as offered on the SRF-39/49/59 family, though.  The Sony chip that is the heart of this family of radios uses some really spooky math and unusual relationships between what is on the chip and the rest of the RF section. Any digital dial accessory will require special programming that is unique for this family of radios....

The folks that I worked with, AADE, were kind enough to develop special programming for the SRF-39 family... I loaned them a set to base their work on.
Their full kit is $49 and a fully assembled unit is $20 more.

N3ZI's unit may be the better deal financially, but only if he is willing and able to do the chip programming necessary for his unit to work with the '39 family.... be sure to ask :>)

I'll get that article up on dxer.ca and announced here by Wednesday.


John B.
Orcas Island, WA, USA
Rcvrs: WiNRADiO 313e, Eton e1, Ultralights
Antennas: Two 70' x 100' Conti Super Loops, West and Northwest





 

i thought i read that someone here had added a digital display to the
UL and i thought some here may be interested in this item.

N3ZI is selling a very nice frequency counter/digital dial for only
$10. http://www.pongrance.com/

Ron


C B
 

Even though it's not an unltralight, I wonder if one of these digital displays could be added to one of my ICF-S5Ws. Thanks for the follow up discussion on this topic.

 

Craig Barnes

Wondervu, CO



--- On Sat, 7/12/08, D1028Gary@... wrote:

From: D1028Gary@...
Subject: Re: [ultralightdx] digital display for $10.00
To: ultralightdx@...
Date: Saturday, July 12, 2008, 10:02 PM

Ron and Others,
 
     I had the chance to view John's SRF-39FP digital display (from aade.com) in action, this week at Grayland, Washington. It was very impressive, but when the $$ are added up, it may not make much sense to purchase it, except perhaps as a curiosity.
 
     For domestic DXing purposes, the SRF-59/39FP analog family of units provide tremendous "bang for the buck," but not when combined with a $69 add-on accessory.  I'm sure John would agree with me that a better solution would be to purchase a digital E100 or DT-200VX, and save the cost of the digital conversion.  Either of these units can be purchased for less than the cost of converting an analog SRF-39/59 unit.
 
     For split-frequency DXers, the SRF-39/59 family of units is easy to modify for increased sensitivity, but their bizarre IF makes conventional narrow IF filters useless, and useful selectivity mods have yet to be designed.  On the other hand, the digital Ultralights (with their 450 and 455 kHz IF's) can all be modified for increased selectivity AND sensitivity.
 
                                                                            73,  Gary 
 
 
    




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Russ Edmunds <wb2bjh@...>
 

--- On Sun, 7/13/08, D1028Gary@aol.com <D1028Gary@aol.com> wrote:


Ron and Others,
 
     I had the chance to view John's SRF-39FP digital display (from aade.com) in action, this week at Grayland, Washington. It was very impressive, but when the $$ are added up, it may not make much sense to purchase it, except perhaps as a curiosity.
 
     For domestic DXing purposes, the SRF-59/39FP analog family of units provide tremendous "bang for the buck," but not when combined with a $69 add-on accessory.  I'm sure John would agree with me that a better solution would be to purchase a digital E100 or DT-200VX, and save the cost of the digital conversion.  Either of these units can be purchased for less than the cost of converting an analog SRF-39/59 unit.
 
                                                                            73,  Gary 
 
 
*** But given that my out-of-the-box DT-200VX is clearly less sensitive and less selective than my peaked-up SRF-59, that doesn't seem like a viable alternative. Nor is the ultimate price differential all that significant. I can't speak for the Eton, however it seems that from most reports it is better than the Sangean in both respects.

Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
<wb2bjh@yahoo.com>
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot
    





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Gary DeBock
 

Hello Russ,
 
     Both the DT-200VX and the Eton E100 typically could use some tweaking out of the box, a fact that we didn't know so well back in January. Even when aligned (which involves significant disassembly on both units), these digital models typically favor either high or low band in sensitivity, but not both.  The SRF-59/39FP models have more broad-banded sensitivity, which is almost certainly related to the different way that analog and digital "front ends" process incoming RF signals.
 
     After considering how to solve this problem on the E100, the "sliding coil" loopstick was created (almost jointly, by John Bryant and me).  This solves the lack of digital broadband sensitivity by "aligning" the loopstick on each selected frequency--  thereby making the modified E100 far more sensitive than the stock unit.
 
                                                                                                    73,  Gary       




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