Batboard

I have a range II astro spectra pre-selector board HRN6002G, and wanted to make it an HRN6012 (The model with the added pre-amp, so I looked over the schematics and compared the differences between the two models, which oddly isn't much. It comes down to swapping a resistor, swapping a capacitor, removing 2 resistors and adding jumpers in their place, and removing a few other resistors- some of which are under a shield.

Is that it? I can the benefits of a pre-amp and not even have any added transistors or extensive componentry, it comes down to alleviating some resistance in the circuit?

Very odd.

I was looking up replacement preselectors on myradiomall.com and noticed that their HRN6012 pre-amp added front end, is an HRN6012E revision, which is somewhat more complex than the 'G' revision, I don't know if that makes a difference, or have gone to check out the differences.

Also, I notiveced some oddity when checking out the preselector I currently have and what other offerings were mentioned..... "MOTOROLA - HRD6002GSP01 BD RCVR VHF R2 FRONT END FDNY"

What's so special about the FDNY version of the astro spectra to justify paying $8 more for a preselector board??

-Josh

The 6012 has a preamp transistor on the board as well.

The 6002SP01 was modified to go from 453-485 instead of the default 450-482. You don't want to use that if you plan on receiving ham frequencies as the frequency rolloff is very sharp and the sensitivity in the lower part of 440 band would suffer.

I got one of the early 6012's released. Definitely makes a difference.

If you look carefully at the original post he's talking about an HRD60xx RXFE; this is for the VHF band. The preamp components are already on the board; you only have to make some value adjustments.

I would agree that anything with SP at the end probably has different band limits.

If the VHF board is still available (the UHF ones aren't), it might be worth buying it if the price is under $100. The UHF RXFE price was around $150. Even though the parts cost to add the preamp to a UHF board was minimal, the time to do it, plus the surface-mount equipment, make it worth your while to buy the original board.

Bob M.

kcbooboo wrote:If you look carefully at the original post he's talking about an HRD60xx RXFE; this is for the VHF band. The preamp components are already on the board; you only have to make some value adjustments.

Damn I need glasses