I originally posted this over in rec.radio.shortwave but didn't get any
response - hopefully someone here will be able to help.

My Yaesu FRG-7 happily locks to the 30 and 31 Mhz ranges in the positions to
the left of 29 Mhz on the dial. (All ranges from 0-29 Mhz work just fine)

From a brief test, it appears the receiver is quite capable of tuning from
30-30.99 Mhz. Sensitivity appears to be less than in the plated frequency
range
(presumably some attenuation by preselector and the band pass filter for
band "D") but still quite usable.

So here are my questions,

Is this normal behaviour for an FRG-7, or does it indicate a problem ?

Would the long-term use of this "extra" receiving range have the potential
to cause problems for the receiver ?

"Barry Carlton" ) writes:
I originally posted this over in rec.radio.shortwave but didn't get any
response - hopefully someone here will be able to help.

My Yaesu FRG-7 happily locks to the 30 and 31 Mhz ranges in the positions to
the left of 29 Mhz on the dial. (All ranges from 0-29 Mhz work just fine)

From a brief test, it appears the receiver is quite capable of tuning from
30-30.99 Mhz. Sensitivity appears to be less than in the plated frequency
range
(presumably some attenuation by preselector and the band pass filter for
band "D") but still quite usable.

So here are my questions,

Is this normal behaviour for an FRG-7, or does it indicate a problem ?

Would the long-term use of this "extra" receiving range have the potential
to cause problems for the receiver ?


I have no idea if it's "normal" but I wouldn't see it as unexpected. We're
talking about an analog system, and there was usually some extra range just
in case. If they designed it for an absolutely fixed range, there was always
the risk that something would drift out of spec and drag the receiver down
with it.

That tuning for the segments is an oscilator above 30MHz that has a 30MHz
range. YOu want some leeway when designing such an oscillator, and the
fact that it can lock an extra step is just icing on the cake. If the specs
allowed for that extra range, and some receivers didn't cover it, then
people could complain. But it's not, so you feel you've received a bonus.

I dont' know what the front end tuning is like, but I'm a tad surprised
you see a drop in sensitivity. I would have thought there'd be enough
leeway there to be able to peak it. If it's not properly peaking, one
might risk receiving spurious responses, depending on factors.

I can't see any reason why using the extra range would hurt anything.

Michael VE2BVW

"Barry Carlton" ) writes:
I originally posted this over in rec.radio.shortwave but didn't get any
response - hopefully someone here will be able to help.

My Yaesu FRG-7 happily locks to the 30 and 31 Mhz ranges in the positions to
the left of 29 Mhz on the dial. (All ranges from 0-29 Mhz work just fine)

From a brief test, it appears the receiver is quite capable of tuning from
30-30.99 Mhz. Sensitivity appears to be less than in the plated frequency
range
(presumably some attenuation by preselector and the band pass filter for
band "D") but still quite usable.

So here are my questions,

Is this normal behaviour for an FRG-7, or does it indicate a problem ?

Would the long-term use of this "extra" receiving range have the potential
to cause problems for the receiver ?


I have no idea if it's "normal" but I wouldn't see it as unexpected. We're
talking about an analog system, and there was usually some extra range just
in case. If they designed it for an absolutely fixed range, there was always
the risk that something would drift out of spec and drag the receiver down
with it.

That tuning for the segments is an oscilator above 30MHz that has a 30MHz
range. YOu want some leeway when designing such an oscillator, and the
fact that it can lock an extra step is just icing on the cake. If the specs
allowed for that extra range, and some receivers didn't cover it, then
people could complain. But it's not, so you feel you've received a bonus.

I dont' know what the front end tuning is like, but I'm a tad surprised
you see a drop in sensitivity. I would have thought there'd be enough
leeway there to be able to peak it. If it's not properly peaking, one
might risk receiving spurious responses, depending on factors.

I can't see any reason why using the extra range would hurt anything.

Michael VE2BVW